i have released the 2.6.19-rt1 tree, which can be downloaded from the
usual place:
http://redhat.com/~mingo/realtime-preempt/
merged to v2.6.19 and applied a few more fixes and a KVM update.
to build a 2.6.19-rt1 tree, the following patches should be applied:
http://kernel.org/pub/linux/kernel/v2.6/linux-2.6.19.tar.bz2
http://redhat.com/~mingo/realtime-preempt/patch-2.6.19-rt1
the -rt YUM repository for Fedora Core 6 and 5, for architectures x86_64
and i686 can be activated via:
cd /etc/yum.repos.d
wget http://people.redhat.com/~mingo/realtime-preempt/rt.repo
yum install kernel-rt.x86_64 # on x86_64
yum install kernel-rt # on i686
yum update kernel-rt # refresh - or enable yum-updatesd
as usual, bugreports, fixes and suggestions are welcome,
Ingo
Am Donnerstag, 30. November 2006 09:33 schrieb Ingo Molnar:
> i have released the 2.6.19-rt1 tree, which can be downloaded from the
Hi Ingo,
here comes a freerunning trace explaining the weirdness I see here.
I tried max_latency tracing first, didn't see anything usefull,
went on with tracing freerunning with a user_trace_stop() at the spot,
where snd-usb-usx2y diagnoses hickup.
I tweaked latency_trace.c to make freerunning work. Will post later.
To get an overview of whats happening, search in this e-mail for
i_usX2Y_usbpcm_urb_complete
. Its the interrupt callback.
Those were the rt priorities with IRQ 17 driving the usb soundcard:
$ ps -ALc|grep FF
2 2 FF 90 ? 00:00:00 posix_cpu_timer
3 3 FF 41 ? 00:00:00 softirq-high/0
4 4 FF 41 ? 00:00:00 softirq-timer/0
5 5 FF 41 ? 00:00:00 softirq-net-tx/
6 6 FF 41 ? 00:00:00 softirq-net-rx/
7 7 FF 41 ? 00:00:00 softirq-block/0
8 8 FF 41 ? 00:00:06 softirq-tasklet
9 9 FF 41 ? 00:00:00 softirq-hrtimer
10 10 FF 41 ? 00:00:00 softirq-rcu/0
11 11 FF 139 ? 00:00:00 watchdog/0
13 13 FF 41 ? 00:00:00 events/0
50 50 FF 89 ? 00:00:00 IRQ 9
242 242 FF 88 ? 00:00:00 IRQ 8
273 273 FF 87 ? 00:00:00 IRQ 14
275 275 FF 86 ? 00:00:00 IRQ 15
295 295 FF 85 ? 00:00:00 IRQ 12
296 296 FF 84 ? 00:00:00 IRQ 1
308 308 FF 120 ? 00:00:30 IRQ 17
735 735 FF 110 ? 00:00:00 IRQ 19
1329 1329 FF 81 ? 00:00:00 IRQ 6
1338 1338 FF 80 ? 00:00:00 IRQ 7
1684 1684 FF 110 ? 00:00:06 IRQ 18
2198 2198 FF 78 ? 00:00:00 IRQ 4
2667 2672 FF 49 pts/0 00:00:00 ardour.bin
2700 2700 FF 90 ? 00:00:00 artsd
$ cat /proc/interrupts
CPU0
0: 1477957 IO-APIC [........N/ 0]-edge timer
1: 7560 IO-APIC [.......M./ 0]-edge i8042
4: 12 IO-APIC [.......M./ 3]-edge serial
7: 0 IO-APIC [..P....M./ 0]-edge parport0
8: 1 IO-APIC [........./ 0]-edge rtc
9: 0 IO-APIC [........./ 0]-fasteoi acpi
12: 62839 IO-APIC [.......M./ 0]-edge i8042
14: 22303 IO-APIC [.......M./ 0]-edge ide0
15: 10169 IO-APIC [.......M./ 0]-edge ide1
17: 967826 IO-APIC [........./ 0]-fasteoi uhci_hcd:usb1, uhci_hcd:usb2, uhci_hcd:usb3, uhci_hcd:usb4, ehci_hcd:usb5
18: 247356 IO-APIC [........./ 1]-fasteoi eth0, nvidia
19: 979 IO-APIC [........./ 0]-fasteoi VIA8237
NMI: 0
LOC: 834
ERR: 0
MIS: 0
Edited Trace, first part showing normal operation,
second part showing things getting weired:
<trace first part>
preemption latency trace v1.1.5 on 2.6.19-rt1.dbg
--------------------------------------------------------------------
latency: 491583660 us, #131071/131071, CPU#0 | (M:rt VP:0, KP:0, SP:1 HP:1)
-----------------
| task: IRQ 17-308 (uid:0 nice:-5 policy:1 rt_prio:80)
-----------------
=> started at: snd_usX2Y_pcm_trigger+0x30/0xf4 <f89d9ff8>
=> ended at: __schedule+0x680/0x70e <c032a74c>
_------=> CPU#
/ _-----=> irqs-off
| / _----=> need-resched
|| / _---=> hardirq/softirq
||| / _--=> preempt-depth
|||| /
||||| delay
cmd pid ||||| time | caller
\ / ||||| \ | /
qjackctl-2668 0D... 0us < (0)
qjackctl-2668 0.... 0us > sys_gettimeofday (b7212324 00000000 0000007b)
qjackctl-2668 0D... 2us < (0)
qjackctl-2668 0.... 2us > sys_write (00000010 b721338a 0000007b)
qjackctl-2668 0.... 4us : try_to_wake_up (c011b4ab 0 0)
qjackctl-2668 0D..1 5us : __activate_task <ardour.b-2675> (172 1)
qjackctl-2668 0D... 6us < (1)
qjackctl-2668 0.... 6us+> sys_read (0000000f b721338a 0000007b)
qjackctl-2668 0D... 9us < (1)
qjackctl-2668 0.... 10us+> sys_poll (0823dea8 00000002 0000007b)
qjackctl-2668 0...1 12us : __schedule (c032a995 0 0)
qjackctl-2668 0D..2 13us : deactivate_task <qjackctl-2668> (172 2)
ardour.b-2675 0D..2 14us+: __schedule <qjackctl-2668> (172 172)
ardour.b-2675 0D... 17us < (1)
ardour.b-2675 0.... 18us > sys_gettimeofday (b01fe324 00000000 0000007b)
ardour.b-2675 0D... 20us!< (0)
ardour.b-2675 0D.h. 178us+: do_IRQ (b6281a8a 0 0)
ardour.b-2675 0D.h1 185us : hrtimer_interrupt (d2f6b90d72 eccc1f4c)
ardour.b-2675 0D.h1 185us : try_to_wake_up (c011b58b 0 0)
ardour.b-2675 0D.h2 186us : effective_prio <ardour.b-2670> (-5 -5)
ardour.b-2675 0D.h2 187us!: __activate_task <ardour.b-2670> (-5 1)
ardour.b-2675 0D.h. 576us : do_IRQ (b61ead92 18 0)
ardour.b-2675 0D.h1 576us : try_to_wake_up (c011b58b 0 0)
ardour.b-2675 0D.h2 577us!: __activate_task <IRQ_18-1674> (170 2)
ardour.b-2675 0D.h. 886us : do_IRQ (b60c7d7a 17 0)
ardour.b-2675 0D.h1 886us : try_to_wake_up (c011b58b 0 0)
ardour.b-2675 0D.h2 887us : __activate_task <IRQ_17-308> (180 3)
ardour.b-2675 0Dnh2 887us+: try_to_wake_up <IRQ_17-308> (180 172)
ardour.b-2675 0Dn.1 894us : __schedule (c010330e 0 0)
IRQ_17-308 0D..2 895us+: __schedule <ardour.b-2675> (172 180)
IRQ_17-308 0.... 905us+: i_usX2Y_usbpcm_urb_complete (8 0 dc3de)
IRQ_17-308 0...1 926us : __schedule (c032a995 0 0)
IRQ_17-308 0D..2 926us : deactivate_task <IRQ_17-308> (180 4)
ardour.b-2675 0D..2 928us!: __schedule <IRQ_17-308> (180 172)
ardour.b-2675 0.... 1060us > sys_gettimeofday (b01fe324 00000000 0000007b)
ardour.b-2675 0D... 1062us < (0)
ardour.b-2675 0.... 1063us+> sys_write (00000017 b01ff38a 0000007b)
ardour.b-2675 0.... 1065us : try_to_wake_up (c011b4ab 0 0)
ardour.b-2675 0D..1 1066us : __activate_task <jackd-2667> (173 3)
ardour.b-2675 0Dn.1 1067us : try_to_wake_up <jackd-2667> (173 172)
ardour.b-2675 0Dn.1 1067us : __schedule (c032a862 0 0)
jackd-2667 0D..2 1069us+: __schedule <ardour.b-2675> (172 173)
jackd-2667 0D..3 1073us : rt_mutex_setprio <ardour.b-2675> (172 173)
jackd-2667 0D..3 1073us : rt_mutex_setprio (0 0 0)
jackd-2667 0...1 1074us : __schedule (c032a995 0 0)
jackd-2667 0D..2 1074us : deactivate_task <jackd-2667> (173 4)
ardour.b-2675 0D..2 1075us : __schedule <jackd-2667> (173 173)
ardour.b-2675 0D..1 1077us : try_to_wake_up (c011b531 0 0)
ardour.b-2675 0D..2 1078us : __activate_task <jackd-2667> (173 3)
ardour.b-2675 0D..2 1079us : rt_mutex_setprio <ardour.b-2675> (173 172)
ardour.b-2675 0Dn.2 1079us : rt_mutex_setprio (0 1 0)
ardour.b-2675 0Dn.1 1080us : __schedule (c032a862 0 0)
jackd-2667 0D..2 1081us : __schedule <ardour.b-2675> (172 173)
jackd-2667 0D... 1083us < (1)
jackd-2667 0.... 1084us > sys_gettimeofday (b6e521b4 00000000 0000007b)
jackd-2667 0D... 1085us < (0)
jackd-2667 0.... 1086us+> sys_read (00000013 b6e52257 0000007b)
jackd-2667 0D... 1089us+< (1)
jackd-2667 0.... 1121us > sys_gettimeofday (b6e52254 00000000 0000007b)
jackd-2667 0D... 1122us < (0)
jackd-2667 0.... 1124us > sys_gettimeofday (b6e522f4 00000000 0000007b)
jackd-2667 0D... 1125us < (0)
jackd-2667 0.... 1126us+> sys_poll (08074440 00000002 0000007b)
jackd-2667 0...1 1132us : __schedule (c032a995 0 0)
jackd-2667 0D..2 1132us : deactivate_task <jackd-2667> (173 4)
ardour.b-2675 0D..2 1134us : __schedule <jackd-2667> (173 172)
ardour.b-2675 0D... 1135us < (1)
ardour.b-2675 0.... 1137us+> sys_read (00000016 b01ff38a 0000007b)
ardour.b-2675 0D... 1139us < (1)
ardour.b-2675 0.... 1140us+> sys_poll (086641a8 00000002 0000007b)
ardour.b-2675 0...1 1143us : __schedule (c032a995 0 0)
ardour.b-2675 0D..2 1144us : deactivate_task <ardour.b-2675> (172 3)
IRQ_18-1674 0D..2 1145us+: __schedule <ardour.b-2675> (172 170)
IRQ_18-1674 0D... 1179us : try_to_wake_up (c011b58b 0 0)
IRQ_18-1674 0D..1 1180us+: __activate_task <softirq--8> (101 2)
IRQ_18-1674 0...1 1187us : __schedule (c032a995 0 0)
IRQ_18-1674 0D..2 1188us : deactivate_task <IRQ_18-1674> (170 3)
softirq--8 0D..2 1189us+: __schedule <IRQ_18-1674> (170 101)
softirq--8 0...1 1236us : __schedule (c032a995 0 0)
softirq--8 0D..2 1237us : deactivate_task <softirq--8> (101 2)
softirq--8 0D..2 1237us : effective_prio <ardour.b-2670> (-5 -5)
ardour.b-2670 0D..2 1238us : __schedule <softirq--8> (101 -5)
ardour.b-2670 0D... 1240us+< (0)
ardour.b-2670 0.... 1249us+> sys_nanosleep (b72ec324 b72ec31c 0000007b)
ardour.b-2670 0D..1 1252us : enqueue_hrtimer (d2f7622b63 eccc1f4c)
ardour.b-2670 0...1 1253us : __schedule (c032a995 0 0)
ardour.b-2670 0D..2 1253us : deactivate_task <ardour.b-2670> (-5 1)
<idle>-0 0D..2 1254us+: __schedule <ardour.b-2670> (-5 20)
<idle>-0 0D..2 1264us!: enqueue_hrtimer (d2f7127753 c039bbd0)
<idle>-0 0D.h1 1886us : do_IRQ (c0102163 17 0)
<idle>-0 0D.h2 1886us : try_to_wake_up (c011b58b 0 0)
<idle>-0 0D.h3 1887us : __activate_task <IRQ_17-308> (180 0)
<idle>-0 0Dnh3 1887us+: try_to_wake_up <IRQ_17-308> (180 20)
<idle>-0 0Dn.1 1898us+: hrtimer_restart_sched_tick (d2f6d3732d 0)
<idle>-0 0Dn.2 1906us+: enqueue_hrtimer (d2f6d90313 c039bbd0)
<idle>-0 0.n.1 1914us : __schedule (c0102264 0 0)
IRQ_17-308 0D..2 1915us+: __schedule <<idle>-0> (20 180)
IRQ_17-308 0.... 1924us+: i_usX2Y_usbpcm_urb_complete (8 0 dc3df)
IRQ_17-308 0...1 1945us : __schedule (c032a995 0 0)
IRQ_17-308 0D..2 1945us : deactivate_task <IRQ_17-308> (180 1)
<idle>-0 0D..2 1946us+: __schedule <IRQ_17-308> (180 20)
<idle>-0 0D..2 1956us!: enqueue_hrtimer (d2f7127753 c039bbd0)
<idle>-0 0D.h1 2885us : do_IRQ (c0102163 17 0)
<idle>-0 0D.h2 2886us : try_to_wake_up (c011b58b 0 0)
<idle>-0 0D.h3 2886us : __activate_task <IRQ_17-308> (180 0)
<idle>-0 0Dnh3 2887us+: try_to_wake_up <IRQ_17-308> (180 20)
<idle>-0 0Dn.1 2897us+: hrtimer_restart_sched_tick (d2f6e2b5ec 0)
<idle>-0 0Dn.2 2905us+: enqueue_hrtimer (d2f7160c13 c039bbd0)
<idle>-0 0.n.1 2913us : __schedule (c0102264 0 0)
IRQ_17-308 0D..2 2914us+: __schedule <<idle>-0> (20 180)
IRQ_17-308 0.... 2922us+: i_usX2Y_usbpcm_urb_complete (8 0 dc3e0)
IRQ_17-308 0...1 2942us : __schedule (c032a995 0 0)
IRQ_17-308 0D..2 2943us : deactivate_task <IRQ_17-308> (180 1)
<idle>-0 0D..2 2944us!: __schedule <IRQ_17-308> (180 20)
<idle>-0 0D.h1 3882us : do_IRQ (c0102163 17 0)
<idle>-0 0D.h2 3883us : try_to_wake_up (c011b58b 0 0)
<idle>-0 0D.h3 3883us : __activate_task <IRQ_17-308> (180 0)
<idle>-0 0Dnh3 3884us+: try_to_wake_up <IRQ_17-308> (180 20)
<idle>-0 0Dn.1 3891us : __schedule (c0102264 0 0)
IRQ_17-308 0D..2 3892us+: __schedule <<idle>-0> (20 180)
IRQ_17-308 0.... 3900us+: i_usX2Y_usbpcm_urb_complete (8 0 dc3e1)
IRQ_17-308 0...1 3920us : __schedule (c032a995 0 0)
IRQ_17-308 0D..2 3921us : deactivate_task <IRQ_17-308> (180 1)
<idle>-0 0D..2 3921us!: __schedule <IRQ_17-308> (180 20)
<idle>-0 0D.h1 4881us : do_IRQ (c0102163 17 0)
<idle>-0 0D.h2 4882us : try_to_wake_up (c011b58b 0 0)
<idle>-0 0D.h3 4883us : __activate_task <IRQ_17-308> (180 0)
<idle>-0 0Dnh3 4883us+: try_to_wake_up <IRQ_17-308> (180 20)
<idle>-0 0Dn.1 4890us : __schedule (c0102264 0 0)
IRQ_17-308 0D..2 4891us+: __schedule <<idle>-0> (20 180)
IRQ_17-308 0.... 4899us+: i_usX2Y_usbpcm_urb_complete (8 0 dc3e2)
IRQ_17-308 0...1 4919us : __schedule (c032a995 0 0)
IRQ_17-308 0D..2 4919us : deactivate_task <IRQ_17-308> (180 1)
<idle>-0 0D..2 4920us!: __schedule <IRQ_17-308> (180 20)
<idle>-0 0D.h1 5880us : do_IRQ (c0102163 17 0)
<idle>-0 0D.h2 5881us : try_to_wake_up (c011b58b 0 0)
<idle>-0 0D.h3 5881us : __activate_task <IRQ_17-308> (180 0)
<idle>-0 0Dnh3 5881us+: try_to_wake_up <IRQ_17-308> (180 20)
<idle>-0 0Dn.1 5888us : __schedule (c0102264 0 0)
IRQ_17-308 0D..2 5889us+: __schedule <<idle>-0> (20 180)
IRQ_17-308 0.... 5898us+: i_usX2Y_usbpcm_urb_complete (8 0 dc3e3)
IRQ_17-308 0.... 5904us : try_to_wake_up (c011b4ab 0 0)
IRQ_17-308 0D..1 5905us+: __activate_task <jackd-2667> (173 1)
IRQ_17-308 0.... 5910us+: try_to_wake_up (c011b4ab 0 0)
IRQ_17-308 0...1 5924us : __schedule (c032a995 0 0)
IRQ_17-308 0D..2 5925us : deactivate_task <IRQ_17-308> (180 2)
jackd-2667 0D..2 5926us+: __schedule <IRQ_17-308> (180 173)
jackd-2667 0D... 5932us < (2)
jackd-2667 0.... 5933us > sys_gettimeofday (b6e522f4 00000000 0000007b)
jackd-2667 0D... 5934us+< (0)
jackd-2667 0.... 5968us > sys_gettimeofday (b6e521b4 00000000 0000007b)
jackd-2667 0D... 5970us < (0)
jackd-2667 0.... 5970us+> sys_write (00000005 b6e52257 0000007b)
jackd-2667 0.... 5973us : try_to_wake_up (c011b4ab 0 0)
jackd-2667 0D..1 5973us : __activate_task <qjackctl-2668> (172 1)
jackd-2667 0D... 5975us < (1)
jackd-2667 0.... 5975us > sys_gettimeofday (b6e521b4 00000000 0000007b)
jackd-2667 0D... 5977us < (0)
jackd-2667 0.... 5977us+> sys_poll (b6e5224c 00000001 0000007b)
jackd-2667 0...1 5980us : __schedule (c032a995 0 0)
jackd-2667 0D..2 5980us : deactivate_task <jackd-2667> (173 2)
qjackctl-2668 0D..2 5982us+: __schedule <jackd-2667> (173 172)
qjackctl-2668 0D... 5985us < (1)
qjackctl-2668 0.... 5986us > sys_gettimeofday (b7212324 00000000 0000007b)
qjackctl-2668 0D... 5988us < (0)
qjackctl-2668 0.... 5989us > sys_gettimeofday (b7212324 00000000 0000007b)
qjackctl-2668 0D... 5990us < (0)
qjackctl-2668 0.... 5990us > sys_write (00000010 b721338a 0000007b)
qjackctl-2668 0.... 5992us : try_to_wake_up (c011b4ab 0 0)
qjackctl-2668 0D..1 5993us : __activate_task <ardour.b-2675> (172 1)
qjackctl-2668 0D... 5994us < (1)
qjackctl-2668 0.... 5994us+> sys_read (0000000f b721338a 0000007b)
qjackctl-2668 0D... 5997us < (1)
qjackctl-2668 0.... 5998us+> sys_poll (0823dea8 00000002 0000007b)
qjackctl-2668 0...1 6001us : __schedule (c032a995 0 0)
qjackctl-2668 0D..2 6001us : deactivate_task <qjackctl-2668> (172 2)
ardour.b-2675 0D..2 6002us+: __schedule <qjackctl-2668> (172 172)
ardour.b-2675 0D... 6006us < (1)
ardour.b-2675 0.... 6007us > sys_gettimeofday (b01fe324 00000000 0000007b)
ardour.b-2675 0D... 6008us!< (0)
ardour.b-2675 0D.h. 6266us+: do_IRQ (b6281cf6 0 0)
ardour.b-2675 0D.h1 6273us+: hrtimer_interrupt (d2f7160c13 c039bbd0)
ardour.b-2675 0D.h. 6277us : try_to_wake_up (c011b58b 0 0)
ardour.b-2675 0D.h1 6277us : __activate_task <softirq--4> (101 1)
ardour.b-2675 0D.h. 6278us : try_to_wake_up (c011b58b 0 0)
ardour.b-2675 0D.h1 6279us : __activate_task <posix_cp-2> (150 2)
ardour.b-2675 0D.h1 6280us!: enqueue_hrtimer (d2f7531513 c039bbd0)
ardour.b-2675 0D.h. 6879us : do_IRQ (b60c7ce3 17 0)
ardour.b-2675 0D.h1 6879us : try_to_wake_up (c011b58b 0 0)
ardour.b-2675 0D.h2 6880us : __activate_task <IRQ_17-308> (180 3)
ardour.b-2675 0Dnh2 6880us+: try_to_wake_up <IRQ_17-308> (180 172)
ardour.b-2675 0Dn.1 6888us : __schedule (c010330e 0 0)
IRQ_17-308 0D..2 6889us+: __schedule <ardour.b-2675> (172 180)
IRQ_17-308 0.... 6898us+: i_usX2Y_usbpcm_urb_complete (8 0 dc3e4)
IRQ_17-308 0...1 6924us : __schedule (c032a995 0 0)
IRQ_17-308 0D..2 6924us : deactivate_task <IRQ_17-308> (180 4)
ardour.b-2675 0D..2 6925us!: __schedule <IRQ_17-308> (180 172)
ardour.b-2675 0.... 7049us > sys_gettimeofday (b01fe324 00000000 0000007b)
ardour.b-2675 0D... 7051us < (0)
ardour.b-2675 0.... 7051us+> sys_write (00000017 b01ff38a 0000007b)
ardour.b-2675 0.... 7054us : try_to_wake_up (c011b4ab 0 0)
ardour.b-2675 0D..1 7055us : __activate_task <jackd-2667> (173 3)
ardour.b-2675 0Dn.1 7056us : try_to_wake_up <jackd-2667> (173 172)
ardour.b-2675 0Dn.1 7056us : __schedule (c032a862 0 0)
jackd-2667 0D..2 7058us+: __schedule <ardour.b-2675> (172 173)
jackd-2667 0D..3 7062us : rt_mutex_setprio <ardour.b-2675> (172 173)
jackd-2667 0D..3 7062us : rt_mutex_setprio (0 0 0)
jackd-2667 0...1 7063us : __schedule (c032a995 0 0)
jackd-2667 0D..2 7063us : deactivate_task <jackd-2667> (173 4)
ardour.b-2675 0D..2 7064us : __schedule <jackd-2667> (173 173)
ardour.b-2675 0D..1 7066us : try_to_wake_up (c011b531 0 0)
ardour.b-2675 0D..2 7067us : __activate_task <jackd-2667> (173 3)
ardour.b-2675 0D..2 7068us : rt_mutex_setprio <ardour.b-2675> (173 172)
ardour.b-2675 0Dn.2 7068us : rt_mutex_setprio (0 1 0)
ardour.b-2675 0Dn.1 7069us : __schedule (c032a862 0 0)
jackd-2667 0D..2 7070us : __schedule <ardour.b-2675> (172 173)
jackd-2667 0D... 7072us < (1)
jackd-2667 0.... 7073us > sys_gettimeofday (b6e521b4 00000000 0000007b)
jackd-2667 0D... 7074us < (0)
jackd-2667 0.... 7075us+> sys_read (00000013 b6e52257 0000007b)
jackd-2667 0D... 7078us+< (1)
jackd-2667 0.... 7110us > sys_gettimeofday (b6e52254 00000000 0000007b)
jackd-2667 0D... 7111us < (0)
jackd-2667 0.... 7113us > sys_gettimeofday (b6e522f4 00000000 0000007b)
jackd-2667 0D... 7114us < (0)
jackd-2667 0.... 7115us+> sys_poll (08074440 00000002 0000007b)
jackd-2667 0...1 7121us : __schedule (c032a995 0 0)
jackd-2667 0D..2 7122us : deactivate_task <jackd-2667> (173 4)
ardour.b-2675 0D..2 7123us : __schedule <jackd-2667> (173 172)
ardour.b-2675 0D... 7125us < (1)
ardour.b-2675 0.... 7126us+> sys_read (00000016 b01ff38a 0000007b)
ardour.b-2675 0D... 7129us < (1)
ardour.b-2675 0.... 7129us+> sys_poll (086641a8 00000002 0000007b)
ardour.b-2675 0...1 7133us : __schedule (c032a995 0 0)
ardour.b-2675 0D..2 7133us : deactivate_task <ardour.b-2675> (172 3)
posix_cp-2 0D..2 7134us : __schedule <ardour.b-2675> (172 150)
posix_cp-2 0...1 7136us : __schedule (c032a995 0 0)
posix_cp-2 0D..2 7136us : deactivate_task <posix_cp-2> (150 2)
softirq--4 0D..2 7137us+: __schedule <posix_cp-2> (150 101)
softirq--4 0.... 7142us : try_to_wake_up (c011b58b 0 0)
softirq--4 0D..1 7142us : effective_prio <ardour.b-2669> (-5 -5)
softirq--4 0D..1 7143us : __activate_task <ardour.b-2669> (-5 1)
softirq--4 0...1 7145us : __schedule (c032a995 0 0)
softirq--4 0D..2 7145us : deactivate_task <softirq--4> (101 2)
softirq--4 0D..2 7146us : effective_prio <ardour.b-2669> (-5 -5)
ardour.b-2669 0D..2 7147us+: __schedule <softirq--4> (101 -5)
ardour.b-2669 0D... 7152us+< (0)
ardour.b-2669 0.... 7159us > sys_gettimeofday (bfb7dfa8 00000000 0000007b)
ardour.b-2669 0D... 7160us!< (0)
ardour.b-2669 0.... 7265us+> sys_ioctl (00000005 0000541b 0000007b)
ardour.b-2669 0D... 7267us < (0)
ardour.b-2669 0.... 7269us > sys_gettimeofday (bfb7df98 00000000 0000007b)
ardour.b-2669 0D... 7270us+< (0)
ardour.b-2669 0.... 7274us+> sys_poll (08c74150 00000003 0000007b)
ardour.b-2669 0D... 7277us!< (0)
ardour.b-2669 0D.h. 7879us : do_IRQ (49b48631 17 0)
ardour.b-2669 0D.h1 7880us : try_to_wake_up (c011b58b 0 0)
ardour.b-2669 0D.h2 7880us : __activate_task <IRQ_17-308> (180 1)
ardour.b-2669 0Dnh2 7881us+: try_to_wake_up <IRQ_17-308> (180 -5)
ardour.b-2669 0Dn.1 7888us : __schedule (c010330e 0 0)
IRQ_17-308 0D..2 7890us+: __schedule <ardour.b-2669> (-5 180)
IRQ_17-308 0.... 7901us+: i_usX2Y_usbpcm_urb_complete (8 0 dc3e5)
IRQ_17-308 0...1 7923us : __schedule (c032a995 0 0)
IRQ_17-308 0D..2 7924us : deactivate_task <IRQ_17-308> (180 2)
ardour.b-2669 0D..2 7925us!: __schedule <IRQ_17-308> (180 -5)
ardour.b-2669 0.... 8457us+> sys_write (00000005 084c56c0 0000007b)
ardour.b-2669 0.... 8469us : try_to_wake_up (c011b4ab 0 0)
ardour.b-2669 0D..1 8470us : effective_prio <X-2287> (-5 -5)
ardour.b-2669 0D..1 8471us+: __activate_task <X-2287> (-5 1)
ardour.b-2669 0D... 8473us+< (2208)
ardour.b-2669 0.... 8479us > sys_ioctl (00000005 0000541b 0000007b)
ardour.b-2669 0D... 8480us < (0)
ardour.b-2669 0.... 8482us > sys_gettimeofday (bfb7df98 00000000 0000007b)
ardour.b-2669 0D... 8484us+< (0)
ardour.b-2669 0.... 8487us+> sys_poll (08c74150 00000003 0000007b)
ardour.b-2669 0...1 8492us : __schedule (c032a995 0 0)
ardour.b-2669 0D..2 8493us : deactivate_task <ardour.b-2669> (-5 2)
ardour.b-2669 0D..2 8493us : effective_prio <X-2287> (-5 -5)
X-2287 0D..2 8495us+: __schedule <ardour.b-2669> (-5 -5)
X-2287 0D... 8540us+< (1)
X-2287 0.... 8549us+> sys_setitimer (00000000 bf850984 0000007b)
X-2287 0D..1 8553us : enqueue_hrtimer (d2f86a4698 f753444c)
X-2287 0D... 8554us < (0)
X-2287 0.... 8556us > sys_gettimeofday (bf85098c 00000000 0000007b)
X-2287 0D... 8557us+< (0)
X-2287 0.... 8564us+> sys_read (00000029 08577c68 0000007b)
X-2287 0.... 8572us : try_to_wake_up (c011b4ab 0 0)
X-2287 0D..1 8573us : effective_prio <ardour.b-2669> (-5 -5)
X-2287 0D..1 8573us+: __activate_task <ardour.b-2669> (-5 1)
X-2287 0D... 8578us!< (2208)
X-2287 0D.h. 8877us : do_IRQ (b7d4d832 17 0)
X-2287 0D.h1 8878us : try_to_wake_up (c011b58b 0 0)
X-2287 0D.h2 8879us : __activate_task <IRQ_17-308> (180 2)
X-2287 0Dnh2 8879us+: try_to_wake_up <IRQ_17-308> (180 -5)
X-2287 0Dn.1 8887us : __schedule (c010330e 0 0)
IRQ_17-308 0D..2 8889us+: __schedule <X-2287> (-5 180)
IRQ_17-308 0.... 8899us+: i_usX2Y_usbpcm_urb_complete (8 0 dc3e6)
IRQ_17-308 0...1 8923us : __schedule (c032a995 0 0)
IRQ_17-308 0D..2 8924us : deactivate_task <IRQ_17-308> (180 3)
<trace first part/>
Big part repeating the same stuff cut out here.
Below the trace shows i_usX2Y_usbpcm_urb_complete() running
under an alien context, and this is where jackd starts stalling:
<trace 2nd part>
<idle>-0 0D.h1 3410029us : do_IRQ (c0102163 17 0)
<idle>-0 0D.h2 3410029us : try_to_wake_up (c011b58b 0 0)
<idle>-0 0D.h3 3410030us : __activate_task <IRQ_17-308> (180 0)
<idle>-0 0Dnh3 3410030us+: try_to_wake_up <IRQ_17-308> (180 20)
<idle>-0 0Dn.1 3410037us : __schedule (c0102264 0 0)
IRQ_17-308 0D..2 3410038us+: __schedule <<idle>-0> (20 180)
IRQ_17-308 0.... 3410047us+: i_usX2Y_usbpcm_urb_complete (8 0 dd133)
IRQ_17-308 0...1 3410066us : __schedule (c032a995 0 0)
IRQ_17-308 0D..2 3410067us : deactivate_task <IRQ_17-308> (180 1)
<idle>-0 0D..2 3410068us!: __schedule <IRQ_17-308> (180 20)
<idle>-0 0D.h1 3410495us : do_IRQ (c0102163 12 0)
<idle>-0 0D.h2 3410496us : try_to_wake_up (c011b58b 0 0)
<idle>-0 0D.h3 3410496us : __activate_task <IRQ_12-295> (145 0)
<idle>-0 0Dnh3 3410497us : try_to_wake_up <IRQ_12-295> (145 20)
<idle>-0 0Dn.1 3410498us : __schedule (c0102264 0 0)
IRQ_12-295 0D..2 3410499us+: __schedule <<idle>-0> (20 145)
IRQ_12-295 0...1 3410508us : __schedule (c032a995 0 0)
IRQ_12-295 0D..2 3410508us : deactivate_task <IRQ_12-295> (145 1)
<idle>-0 0D..2 3410509us!: __schedule <IRQ_12-295> (145 20)
<idle>-0 0D.h1 3410985us+: do_IRQ (c0102163 0 0)
<idle>-0 0D.h2 3410992us+: hrtimer_interrupt (d3c2380013 c039bbd0)
<idle>-0 0D.h1 3410995us : try_to_wake_up (c011b58b 0 0)
<idle>-0 0D.h2 3410996us : __activate_task <softirq--4> (101 0)
<idle>-0 0Dnh2 3410996us : try_to_wake_up <softirq--4> (101 20)
<idle>-0 0Dnh1 3410997us : try_to_wake_up (c011b58b 0 0)
<idle>-0 0Dnh2 3410998us : __activate_task <posix_cp-2> (150 1)
<idle>-0 0Dnh2 3410998us : try_to_wake_up <posix_cp-2> (150 20)
<idle>-0 0Dnh2 3410999us+: enqueue_hrtimer (d3c2750913 c039bbd0)
<idle>-0 0Dn.1 3411008us : __schedule (c0102264 0 0)
posix_cp-2 0D..2 3411009us : __schedule <<idle>-0> (20 150)
posix_cp-2 0...1 3411010us : __schedule (c032a995 0 0)
posix_cp-2 0D..2 3411011us : deactivate_task <posix_cp-2> (150 2)
softirq--4 0D..2 3411012us+: __schedule <posix_cp-2> (150 101)
softirq--4 0D.h. 3411028us : do_IRQ (c027b5d4 17 0)
softirq--4 0D.h1 3411028us : try_to_wake_up (c011b58b 0 0)
softirq--4 0D.h2 3411029us : __activate_task <IRQ_17-308> (180 1)
softirq--4 0Dnh2 3411029us+: try_to_wake_up <IRQ_17-308> (180 101)
softirq--4 0Dn.1 3411036us : __schedule (c032aed7 0 0)
IRQ_17-308 0D..2 3411037us+: __schedule <softirq--4> (101 180)
IRQ_17-308 0D..3 3411044us : rt_mutex_setprio <softirq--4> (101 180)
IRQ_17-308 0D..3 3411044us : rt_mutex_setprio (0 0 0)
IRQ_17-308 0...1 3411045us : __schedule (c032a995 0 0)
IRQ_17-308 0D..2 3411046us : deactivate_task <IRQ_17-308> (180 2)
softirq--4 0D..2 3411047us+: __schedule <IRQ_17-308> (180 180)
softirq--4 0D..1 3411050us : try_to_wake_up (c011b531 0 0)
softirq--4 0D..2 3411050us : __activate_task <IRQ_17-308> (180 1)
softirq--4 0D..2 3411051us : rt_mutex_setprio <softirq--4> (180 101)
softirq--4 0Dn.2 3411052us : rt_mutex_setprio (0 1 0)
softirq--4 0Dn.1 3411052us : __schedule (c032a862 0 0)
IRQ_17-308 0D..2 3411053us+: __schedule <softirq--4> (101 180)
IRQ_17-308 0...1 3411063us : __schedule (c032a995 0 0)
IRQ_17-308 0D..2 3411063us : deactivate_task <IRQ_17-308> (180 2)
softirq--4 0D..2 3411064us+: __schedule <IRQ_17-308> (180 101)
softirq--4 0.... 3411072us+: i_usX2Y_usbpcm_urb_complete (8 0 dd134)
softirq--4 0.... 3411078us : try_to_wake_up (c011b4ab 0 0)
softirq--4 0D..1 3411079us : __activate_task <jackd-2667> (173 1)
softirq--4 0Dn.1 3411079us : try_to_wake_up <jackd-2667> (173 101)
softirq--4 0Dn.1 3411080us : __schedule (c032a862 0 0)
jackd-2667 0D..2 3411081us+: __schedule <softirq--4> (101 173)
jackd-2667 0D..3 3411085us : rt_mutex_setprio <softirq--4> (101 173)
jackd-2667 0D..3 3411085us : rt_mutex_setprio (0 0 0)
jackd-2667 0...1 3411086us : __schedule (c032a995 0 0)
jackd-2667 0D..2 3411087us : deactivate_task <jackd-2667> (173 2)
softirq--4 0D..2 3411087us+: __schedule <jackd-2667> (173 173)
softirq--4 0D..1 3411090us : try_to_wake_up (c011b531 0 0)
softirq--4 0D..2 3411090us : __activate_task <jackd-2667> (173 1)
softirq--4 0D..2 3411091us : rt_mutex_setprio <softirq--4> (173 101)
softirq--4 0Dn.2 3411092us : rt_mutex_setprio (0 1 0)
softirq--4 0Dn.1 3411092us : __schedule (c032a862 0 0)
jackd-2667 0D..2 3411093us+: __schedule <softirq--4> (101 173)
jackd-2667 0D... 3411098us < (1)
jackd-2667 0.... 3411099us > sys_gettimeofday (b6e522f4 00000000 0000007b)
jackd-2667 0D... 3411101us < (0)
jackd-2667 0.... 3411102us > sys_gettimeofday (b6e522f4 00000000 0000007b)
jackd-2667 0D... 3411104us < (0)
jackd-2667 0.... 3411104us+> sys_poll (08074440 00000001 0000007b)
jackd-2667 0...1 3411107us : __schedule (c032a995 0 0)
jackd-2667 0D..2 3411108us : deactivate_task <jackd-2667> (173 2)
softirq--4 0D..2 3411109us+: __schedule <jackd-2667> (173 101)
softirq--4 0.... 3411114us : try_to_wake_up (c011b4ab 0 0)
softirq--4 0D..1 3411114us : __activate_task <jackd-2667> (173 1)
softirq--4 0Dn.1 3411115us : try_to_wake_up <jackd-2667> (173 101)
softirq--4 0Dn.1 3411115us : __schedule (c032a862 0 0)
jackd-2667 0D..2 3411116us+: __schedule <softirq--4> (101 173)
jackd-2667 0D..3 3411120us : rt_mutex_setprio <softirq--4> (101 173)
jackd-2667 0D..3 3411120us : rt_mutex_setprio (0 0 0)
jackd-2667 0...1 3411121us : __schedule (c032a995 0 0)
jackd-2667 0D..2 3411122us : deactivate_task <jackd-2667> (173 2)
softirq--4 0D..2 3411122us+: __schedule <jackd-2667> (173 173)
softirq--4 0D..1 3411125us : try_to_wake_up (c011b531 0 0)
softirq--4 0D..2 3411125us : __activate_task <jackd-2667> (173 1)
softirq--4 0D..2 3411126us : rt_mutex_setprio <softirq--4> (173 101)
softirq--4 0Dn.2 3411127us : rt_mutex_setprio (0 1 0)
softirq--4 0Dn.1 3411127us : __schedule (c032a862 0 0)
jackd-2667 0D..2 3411128us+: __schedule <softirq--4> (101 173)
jackd-2667 0D... 3411131us < (1)
jackd-2667 0.... 3411131us > sys_gettimeofday (b6e522f4 00000000 0000007b)
jackd-2667 0D... 3411133us+< (0)
jackd-2667 0.... 3411167us > sys_gettimeofday (b6e521b4 00000000 0000007b)
jackd-2667 0D... 3411168us < (0)
jackd-2667 0.... 3411169us+> sys_write (00000005 b6e52257 0000007b)
jackd-2667 0.... 3411171us : try_to_wake_up (c011b4ab 0 0)
jackd-2667 0D..1 3411172us : __activate_task <qjackctl-2668> (172 2)
jackd-2667 0D... 3411174us < (1)
jackd-2667 0.... 3411174us > sys_gettimeofday (b6e521b4 00000000 0000007b)
jackd-2667 0D... 3411176us < (0)
jackd-2667 0.... 3411176us+> sys_poll (b6e5224c 00000001 0000007b)
jackd-2667 0...1 3411178us : __schedule (c032a995 0 0)
jackd-2667 0D..2 3411179us : deactivate_task <jackd-2667> (173 3)
qjackctl-2668 0D..2 3411180us+: __schedule <jackd-2667> (173 172)
qjackctl-2668 0D... 3411183us < (1)
qjackctl-2668 0.... 3411184us > sys_gettimeofday (b7212324 00000000 0000007b)
qjackctl-2668 0D... 3411186us < (0)
qjackctl-2668 0.... 3411186us > sys_gettimeofday (b7212324 00000000 0000007b)
qjackctl-2668 0D... 3411188us < (0)
qjackctl-2668 0.... 3411188us > sys_write (00000010 b721338a 0000007b)
qjackctl-2668 0.... 3411190us : try_to_wake_up (c011b4ab 0 0)
qjackctl-2668 0D..1 3411191us : __activate_task <ardour.b-2675> (172 2)
qjackctl-2668 0D... 3411192us < (1)
qjackctl-2668 0.... 3411193us+> sys_read (0000000f b721338a 0000007b)
qjackctl-2668 0D... 3411195us < (1)
qjackctl-2668 0.... 3411196us+> sys_poll (0823dea8 00000002 0000007b)
qjackctl-2668 0...1 3411199us : __schedule (c032a995 0 0)
qjackctl-2668 0D..2 3411199us : deactivate_task <qjackctl-2668> (172 3)
ardour.b-2675 0D..2 3411201us+: __schedule <qjackctl-2668> (172 172)
ardour.b-2675 0D... 3411204us < (1)
ardour.b-2675 0.... 3411205us > sys_gettimeofday (b01fe324 00000000 0000007b)
ardour.b-2675 0D... 3411206us+< (0)
ardour.b-2675 0D.h. 3411229us+: do_IRQ (b61f8f9a 0 0)
ardour.b-2675 0D.h1 3411236us : hrtimer_interrupt (d3c23bbde0 eccc1f4c)
ardour.b-2675 0D.h1 3411237us : try_to_wake_up (c011b58b 0 0)
ardour.b-2675 0D.h2 3411238us : effective_prio <ardour.b-2670> (-5 -5)
ardour.b-2675 0D.h2 3411238us!: __activate_task <ardour.b-2670> (-5 2)
ardour.b-2675 0D.h. 3411710us : do_IRQ (b6281b98 12 0)
ardour.b-2675 0D.h1 3411711us : try_to_wake_up (c011b58b 0 0)
ardour.b-2675 0D.h2 3411711us!: __activate_task <IRQ_12-295> (145 3)
ardour.b-2675 0D.h. 3412027us : do_IRQ (b60c7d6b 17 0)
ardour.b-2675 0D.h1 3412028us : try_to_wake_up (c011b58b 0 0)
ardour.b-2675 0D.h2 3412028us : __activate_task <IRQ_17-308> (180 4)
ardour.b-2675 0Dnh2 3412029us+: try_to_wake_up <IRQ_17-308> (180 172)
ardour.b-2675 0Dn.1 3412036us : __schedule (c010330e 0 0)
IRQ_17-308 0D..2 3412037us+: __schedule <ardour.b-2675> (172 180)
IRQ_17-308 0...1 3412051us : __schedule (c032a995 0 0)
IRQ_17-308 0D..2 3412051us : deactivate_task <IRQ_17-308> (180 5)
ardour.b-2675 0D..2 3412052us!: __schedule <IRQ_17-308> (180 172)
ardour.b-2675 0.... 3412236us > sys_gettimeofday (b01fe324 00000000 0000007b)
ardour.b-2675 0D... 3412238us < (0)
ardour.b-2675 0.... 3412238us+> sys_write (00000017 b01ff38a 0000007b)
ardour.b-2675 0.... 3412241us : try_to_wake_up (c011b4ab 0 0)
ardour.b-2675 0D..1 3412242us : __activate_task <jackd-2667> (173 4)
ardour.b-2675 0Dn.1 3412242us : try_to_wake_up <jackd-2667> (173 172)
ardour.b-2675 0Dn.1 3412243us : __schedule (c032a862 0 0)
jackd-2667 0D..2 3412244us+: __schedule <ardour.b-2675> (172 173)
jackd-2667 0D..3 3412248us : rt_mutex_setprio <ardour.b-2675> (172 173)
jackd-2667 0D..3 3412248us : rt_mutex_setprio (0 0 0)
jackd-2667 0...1 3412249us : __schedule (c032a995 0 0)
jackd-2667 0D..2 3412250us : deactivate_task <jackd-2667> (173 5)
ardour.b-2675 0D..2 3412251us : __schedule <jackd-2667> (173 173)
ardour.b-2675 0D..1 3412253us : try_to_wake_up (c011b531 0 0)
ardour.b-2675 0D..2 3412253us : __activate_task <jackd-2667> (173 4)
ardour.b-2675 0D..2 3412254us : rt_mutex_setprio <ardour.b-2675> (173 172)
ardour.b-2675 0Dn.2 3412254us : rt_mutex_setprio (0 1 0)
ardour.b-2675 0Dn.1 3412255us : __schedule (c032a862 0 0)
jackd-2667 0D..2 3412256us : __schedule <ardour.b-2675> (172 173)
jackd-2667 0D... 3412258us < (1)
jackd-2667 0.... 3412259us > sys_gettimeofday (b6e521b4 00000000 0000007b)
jackd-2667 0D... 3412260us < (0)
jackd-2667 0.... 3412261us+> sys_read (00000013 b6e52257 0000007b)
jackd-2667 0D... 3412264us+< (1)
jackd-2667 0.... 3412296us > sys_gettimeofday (b6e52254 00000000 0000007b)
jackd-2667 0D... 3412297us < (0)
jackd-2667 0.... 3412299us > sys_gettimeofday (b6e522f4 00000000 0000007b)
jackd-2667 0D... 3412301us < (0)
jackd-2667 0.... 3412301us+> sys_poll (08074440 00000002 0000007b)
jackd-2667 0...1 3412307us : __schedule (c032a995 0 0)
jackd-2667 0D..2 3412308us : deactivate_task <jackd-2667> (173 5)
ardour.b-2675 0D..2 3412309us : __schedule <jackd-2667> (173 172)
ardour.b-2675 0D... 3412311us < (1)
ardour.b-2675 0.... 3412312us+> sys_read (00000016 b01ff38a 0000007b)
ardour.b-2675 0D... 3412315us < (1)
ardour.b-2675 0.... 3412316us+> sys_poll (086641a8 00000002 0000007b)
ardour.b-2675 0...1 3412319us : __schedule (c032a995 0 0)
ardour.b-2675 0D..2 3412320us : deactivate_task <ardour.b-2675> (172 4)
IRQ_12-295 0D..2 3412321us+: __schedule <ardour.b-2675> (172 145)
IRQ_12-295 0...1 3412328us : __schedule (c032a995 0 0)
IRQ_12-295 0D..2 3412328us : deactivate_task <IRQ_12-295> (145 3)
softirq--4 0D..2 3412329us+: __schedule <IRQ_12-295> (145 101)
softirq--4 0.... 3412340us+: i_usX2Y_usbpcm_urb_complete (8 0 dd135)
softirq--4 0...1 3412358us : __schedule (c032a995 0 0)
softirq--4 0D..2 3412358us : deactivate_task <softirq--4> (101 2)
softirq--4 0D..2 3412359us : effective_prio <ardour.b-2670> (-5 -5)
ardour.b-2670 0D..2 3412360us : __schedule <softirq--4> (101 -5)
ardour.b-2670 0D... 3412361us+< (0)
ardour.b-2670 0.... 3412372us+> sys_nanosleep (b72ec324 b72ec31c 0000007b)
ardour.b-2670 0D..1 3412374us : enqueue_hrtimer (d3c2e5eed0 eccc1f4c)
ardour.b-2670 0...1 3412375us : __schedule (c032a995 0 0)
ardour.b-2670 0D..2 3412375us : deactivate_task <ardour.b-2670> (-5 1)
<idle>-0 0D..2 3412376us+: __schedule <ardour.b-2670> (-5 20)
<idle>-0 0D..2 3412386us!: enqueue_hrtimer (d3c2ae7d53 c039bbd0)
<idle>-0 0D.h1 3413027us : do_IRQ (c0102163 17 0)
<idle>-0 0D.h2 3413027us : try_to_wake_up (c011b58b 0 0)
<idle>-0 0D.h3 3413028us : __activate_task <IRQ_17-308> (180 0)
<idle>-0 0Dnh3 3413028us+: try_to_wake_up <IRQ_17-308> (180 20)
<idle>-0 0Dn.1 3413039us+: hrtimer_restart_sched_tick (d3c2577fb8 0)
<idle>-0 0Dn.2 3413047us+: enqueue_hrtimer (d3c2750913 c039bbd0)
<idle>-0 0.n.1 3413055us : __schedule (c0102264 0 0)
IRQ_17-308 0D..2 3413056us+: __schedule <<idle>-0> (20 180)
IRQ_17-308 0.... 3413064us : i_usX2Y_usbpcm_urb_complete (8 ffffffee dd136)
vim:ft=help
<trace 2nd part/>
Karsten
Am Dienstag, 5. Dezember 2006 01:19 schrieb Karsten Wiese:
> Am Donnerstag, 30. November 2006 09:33 schrieb Ingo Molnar:
> > i have released the 2.6.19-rt1 tree, which can be downloaded from the
>
> Hi Ingo,
>
> here comes a freerunning trace explaining the weirdness I see here.
> I tried max_latency tracing first, didn't see anything usefull,
> went on with tracing freerunning with a user_trace_stop() at the spot,
> where snd-usb-usx2y diagnoses hickup.
Seams to hickup when irq happens while uhci_hcd is busy doing some
kind of timer triggered housekeeping.
Will look into uhci code deeper ;-)
Karsten
* Karsten Wiese <[email protected]> wrote:
> I tweaked latency_trace.c to make freerunning work. Will post later.
ok, please do.
i'm trying to understand your trace:
> Below the trace shows i_usX2Y_usbpcm_urb_complete() running under an
> alien context, and this is where jackd starts stalling:
by 'alien context' do you mean softirq--4? That is the following kernel
thread:
4 ? S 0:00 [softirq-high/0]
handling HI_SOFTIRQ softirqs, which are the 'highprio' tasklets.
> IRQ_17-308 0D..2 3411063us : deactivate_task <IRQ_17-308> (180 2)
> softirq--4 0D..2 3411064us+: __schedule <IRQ_17-308> (180 101)
> softirq--4 0.... 3411072us+: i_usX2Y_usbpcm_urb_complete (8 0 dd134)
> softirq--4 0.... 3411078us : try_to_wake_up (c011b4ab 0 0)
> softirq--4 0D..1 3411079us : __activate_task <jackd-2667> (173 1)
> softirq--4 0Dn.1 3411079us : try_to_wake_up <jackd-2667> (173 101)
> softirq--4 0Dn.1 3411080us : __schedule (c032a862 0 0)
> jackd-2667 0D..2 3411081us+: __schedule <softirq--4> (101 173)
it's running at SCHED_FIFO prio 80.
it's probably this use in sound/usb/usbmidi.c:
tasklet_hi_schedule(&port->ep->tasklet);
so what is your observation - if i_usX2Y_usbpcm_urb_complete() is
executed in this tasklet then you are seeing xruns/delays?
Ingo