Sistina: I'm NOT a support customer; consider me a voluntary beta
tester of LVM2. You might be interested in this...
[1.] One line summary of the problem:
During performance test (using iozone) against nfs server with
kernel 2.4.18-rc4 + linux-2.4.18-NFS_ALL.dif (provided against
2.4.18-rc2, went in cleanly) from nfs.sourceforge.net + Sistina's
LVM2 beta1.1, Oops occurs.
[2.] Full description of the problem/report:
Client and Server running same aforementioned kernel, NFS parameters
set to rsize==wsize==4096; udp. Exported FS is an ext3 on a LV on
two PVs (linear/segmented, not striped), one is a complete SCSI disk
(sda), the other is a partition of an IDE disk (hda5). "./iozone -ac
-R -n 256m" showed results for write/rewrite/read/reread; showed
"Error writing block at 219414528", "write: Input/output error",
"iozone: interrupted" before random read result. Result "never"
comes up (not in 15+ minutes), iozone appears hung (Ctrl-C won't
break it, kill -9 does).
Checking at the server shows oops detailed below, and high load
(around 8, stays up even after iozone was killed). No processes on
server show responsible for the load average in "top".
Same iozone against other NFS server works (more than one iteration,
this NFS server will be called "reference server" from here on). The
reference server is different hardware (see next paragraph and
[7.7]), esp. different ethernet controller. Reference server does
*NOT* employ LVM; but *does* also use ext3.
All boxen X86, server is a Celeron 900 (PIII-Core-based); client is
a Pentium III 850; running identical kernels. Reference server is a
dual Pentium Pro 200 SMP, using the same kernel modulo SMP turned
on. More info on hardware available on request.
[3.] Keywords (i.e., modules, networking, kernel):
NFS (Trond's NFS Patches), LVM, ext3
[4.] Kernel version (from /proc/version):
Linux version 2.4.18-rc4 ([email protected]) (gcc version
2.96 20000731 (Red Hat Linux 7.1 2.96-98)) #1 Tue Feb 26 18:11:31
CET 2002
[5.] Output of Oops.. message (if applicable) with symbolic information
resolved (see Documentation/oops-tracing.txt)
Assertion failure in journal_dirty_data_R79f5b221() at transaction.c:975: "jh->b_transaction == journal->j_committing_transaction"
ksymoops 2.4.3 on i686 2.4.18-rc4. Options used
-V (default)
-k /proc/ksyms (default)
-l /proc/modules (default)
-o /lib/modules/2.4.18-rc4/ (default)
-m /boot/kernel/System.map-2.4.18-rc4 (specified)
-i
invalid operand: 0000
CPU: 0
EIP: 0010:[tulip:__insmod_tulip_O/lib/modules/2.4.18-rc4/kernel/drivers/net/+-896957/96] Not tainted
EIP: 0010:[<d083c043>] Not tainted
Using defaults from ksymoops -t elf32-i386 -a i386
EFLAGS: 00013296
eax: 00000086 ebx: c8741e3c ecx: 00000009 edx: ce8c1f64
esi: 00000001 edi: cf774c00 ebp: c8e098c0 esp: cdbfdd0c
ds: 0018 es: 0018 ss: 0018
Process nfsd (pid: 1041, stackpage=cdbfd000)
Stack: d0841b20 d08414d5 d08413d0 000003cf d0841d40 00000000 c8e098c0 cb4344f0
00000000 00000000 c2be9860 c8e098c0 00000000 00001000 d0848bf6 c8e098c0
c2be9860 00000000 00007883 cf774a00 c0143da5 00003246 cdbfddac 00003246
Call Trace: [tulip:__insmod_tulip_O/lib/modules/2.4.18-rc4/kernel/drivers/net/+-873696/96] [tulip:__insmod_tulip_O/lib/modules/2.4.18-rc4/kernel/drivers/net
Call Trace: [<d0841b20>] [<d08414d5>] [<d08413d0>] [<d0841d40>] [<d0848bf6>]
[<c0143da5>] [<d0840ec7>] [<d0848a2a>] [<d0848e31>] [<d0848be0>] [<d08486a0>]
[<c0127f93>] [<c019a5fa>] [<d095904c>] [<c010842c>] [<c010a468>] [<d0852ae0>]
[<d095e140>] [<d0964a60>] [<d0955577>] [<d0964a60>] [<d092c8d6>] [<d09643d8>]
[<d09643f8>] [<d0955387>] [<c0105726>] [<d09551b0>]
Code: 0f 0b 83 c4 14 83 7b 08 02 0f 87 ac 00 00 00 8b 4c 24 30 85
>>EIP; d083c042 <[jbd]journal_dirty_data+82/170> <=====
Trace; d0841b20 <[jbd].LC4+20/40>
Trace; d08414d4 <[jbd].LC37+a/14>
Trace; d08413d0 <[jbd].LC10+c/1a>
Trace; d0841d40 <[jbd].LC15+0/40>
Trace; d0848bf6 <[ext3]journal_dirty_sync_data+16/60>
Trace; c0143da4 <iget4+44/d0>
Trace; d0840ec6 <[jbd]__jbd_kmalloc+26/80>
Trace; d0848a2a <[ext3]walk_page_buffers+5a/80>
Trace; d0848e30 <[ext3]ext3_commit_write+120/1d0>
Trace; d0848be0 <[ext3]journal_dirty_sync_data+0/60>
Trace; d08486a0 <[ext3]ext3_get_block+0/60>
Trace; c0127f92 <generic_file_write+4c2/6d0>
Trace; c019a5fa <net_rx_action+1ca/2a0>
Trace; d095904c <[nfsd]nfsd_write+14c/2d0>
Trace; c010842c <do_IRQ+9c/b0>
Trace; c010a468 <call_do_IRQ+6/e>
Trace; d0852ae0 <[ext3]ext3_file_operations+0/60>
Trace; d095e140 <[nfsd]nfsd3_proc_write+f0/110>
Trace; d0964a60 <[nfsd]nfsd_procedures3+e0/2c0>
Trace; d0955576 <[nfsd]nfsd_dispatch+b6/190>
Trace; d0964a60 <[nfsd]nfsd_procedures3+e0/2c0>
Trace; d092c8d6 <[sunrpc]svc_process+306/4c0>
Trace; d09643d8 <[nfsd]nfsd_version3+0/10>
Trace; d09643f8 <[nfsd]nfsd_program+0/1c>
Trace; d0955386 <[nfsd]nfsd+1d6/310>
Trace; c0105726 <kernel_thread+26/30>
Trace; d09551b0 <[nfsd]nfsd+0/310>
Code; d083c042 <[jbd]journal_dirty_data+82/170>
00000000 <_EIP>:
Code; d083c042 <[jbd]journal_dirty_data+82/170> <=====
0: 0f 0b ud2a <=====
Code; d083c044 <[jbd]journal_dirty_data+84/170>
2: 83 c4 14 add $0x14,%esp
Code; d083c046 <[jbd]journal_dirty_data+86/170>
5: 83 7b 08 02 cmpl $0x2,0x8(%ebx)
Code; d083c04a <[jbd]journal_dirty_data+8a/170>
9: 0f 87 ac 00 00 00 ja bb <_EIP+0xbb> d083c0fc <[jbd]journal_dirty_data+13c/170>
Code; d083c050 <[jbd]journal_dirty_data+90/170>
f: 8b 4c 24 30 mov 0x30(%esp,1),%ecx
Code; d083c054 <[jbd]journal_dirty_data+94/170>
13: 85 00 test %eax,(%eax)
[6.] A small shell script or example program which triggers the
problem (if possible)
./iozone -ac -R -n 256m
against an ext3 filesystem on an LVM2 beta1.1 through NFS (both
client and server using Trond's Patches)
[7.] Environment
If not seperately indicated, only information of the oopsing server
is shown. Further info also on the other machines on request.
[7.1.] Software (add the output of the ver_linux script here)
Linux terra.fo.et.local 2.4.18-rc4 #1 Tue Feb 26 18:11:31 CET 2002 i686 unknown
Gnu C 2.96
Gnu make 3.79.1
binutils 2.11.90.0.8
util-linux 2.11f
mount 2.11g
modutils 2.4.6
e2fsprogs 1.23
reiserfsprogs 3.x.0j
pcmcia-cs 3.1.22
PPP 2.4.1
isdn4k-utils 3.1pre1
Linux C Library 2.2.4
Dynamic linker (ldd) 2.2.4
Procps 2.0.7
Net-tools 1.60
Console-tools 0.3.3
Sh-utils 2.0.11
Modules Loaded es1370 gameport soundcore nfs mga agpgart nfsd lockd sunrpc autofs tulip af_packet md ospm_thermal ospm_processor ospm_button ospm_system ospm_busmgr lvm-mod dm-mod sr_mod cdrom sd_mod aic7xxx scsi_mod usb-uhci usbcore rtc unix ext3 jbd ide-disk ide-probe-mod ide-mod
[7.2.] Processor information (from /proc/cpuinfo):
processor : 0
vendor_id : GenuineIntel
cpu family : 6
model : 8
model name : Celeron (Coppermine)
stepping : 10
cpu MHz : 896.854
cache size : 128 KB
fdiv_bug : no
hlt_bug : no
f00f_bug : no
coma_bug : no
fpu : yes
fpu_exception : yes
cpuid level : 2
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 mmx fxsr sse
bogomips : 1789.13
[7.3.] Module information (from /proc/modules):
es1370 25008 0 (autoclean)
gameport 1552 0 (autoclean) [es1370]
soundcore 3664 4 (autoclean) [es1370]
nfs 74944 1 (autoclean)
mga 98528 0
agpgart 31072 1
nfsd 66656 8 (autoclean)
lockd 47344 1 (autoclean) [nfs nfsd]
sunrpc 62240 1 (autoclean) [nfs nfsd lockd]
autofs 9120 3 (autoclean)
tulip 37456 1
af_packet 11968 0 (autoclean)
md 44000 0 (unused)
ospm_thermal 5808 0 (unused)
ospm_processor 5616 0 (unused)
ospm_button 3264 0 (unused)
ospm_system 5936 0 (unused)
ospm_busmgr 11616 0 [ospm_thermal ospm_processor ospm_button ospm_system]
lvm-mod 45536 0 (unused)
dm-mod 24048 3
sr_mod 12560 0
cdrom 27872 0 [sr_mod]
sd_mod 10800 4
aic7xxx 112640 2
scsi_mod 90432 3 [sr_mod sd_mod aic7xxx]
usb-uhci 21344 0 (unused)
usbcore 50112 1 [usb-uhci]
rtc 5664 0 (autoclean)
unix 13552 31
ext3 57776 2
jbd 36096 2 [ext3]
ide-disk 6736 3
ide-probe-mod 7712 0
ide-mod 148960 3 [ide-disk ide-probe-mod]
[7.4.] Loaded driver and hardware information (/proc/ioports,
/proc/iomem)
0000-001f : dma1
0020-003f : pic1
0040-005f : timer
0060-006f : keyboard
0070-007f : rtc
0080-008f : dma page reg
00a0-00bf : pic2
00c0-00df : dma2
00f0-00ff : fpu
01f0-01f7 : ide0
03c0-03df : vga+
03f6-03f6 : ide0
0cf8-0cff : PCI conf1
5000-500f : Intel Corp. 82820 820 (Camino 2) Chipset SMBus
c000-cfff : PCI Bus #02
c000-c03f : Ensoniq ES1370 [AudioPCI]
c000-c03f : es1370
c400-c4ff : Lite-On Communications Inc LNE100TX
c400-c4ff : tulip
c800-c8ff : Adaptec AHA-294x / AIC-7871
c800-c8ff : aic7xxx
d000-d01f : Intel Corp. 82820 820 (Camino 2) Chipset USB (Hub A)
d000-d01f : usb-uhci
d800-d81f : Intel Corp. 82820 820 (Camino 2) Chipset USB (Hub B)
d800-d81f : usb-uhci
f000-f00f : Intel Corp. 82820 820 (Camino 2) Chipset IDE U100
f000-f007 : ide0
f008-f00f : ide1
00000000-0009fbff : System RAM
0009fc00-0009ffff : reserved
000a0000-000bffff : Video RAM area
000c0000-000c7fff : Video ROM
000d0000-000d27ff : Extension ROM
000f0000-000fffff : System ROM
00100000-0ffeffff : System RAM
00100000-001df582 : Kernel code
001df583-00215c4b : Kernel data
0fff0000-0fff2fff : ACPI Non-volatile Storage
0fff3000-0fffffff : ACPI Tables
d0000000-d3ffffff : Intel Corp. 82815 815 Chipset Host Bridge and Memory Controller Hub
d4000000-d7ffffff : PCI Bus #01
d4000000-d4003fff : Matrox Graphics, Inc. MGA G400 AGP
d5000000-d57fffff : Matrox Graphics, Inc. MGA G400 AGP
d8000000-d9ffffff : PCI Bus #01
d8000000-d9ffffff : Matrox Graphics, Inc. MGA G400 AGP
da000000-dbffffff : PCI Bus #02
db000000-db0000ff : Lite-On Communications Inc LNE100TX
db000000-db0000ff : tulip
db001000-db001fff : Adaptec AHA-294x / AIC-7871
db001000-db001fff : aic7xxx
ffb00000-ffffffff : reserved
[7.5.] PCI information ('lspci -vvv' as root)
00:00.0 Host bridge: Intel Corporation 82815 815 Chipset Host Bridge and Memory Controller Hub (rev 02)
Subsystem: Intel Corporation 82815 815 Chipset Host Bridge and Memory Controller Hub
Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B-
Status: Cap+ 66Mhz- UDF- FastB2B+ ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort+ >SERR- <PERR-
Latency: 0
Region 0: Memory at d0000000 (32-bit, prefetchable) [size=64M]
Capabilities: [88] #09 [e104]
Capabilities: [a0] AGP version 2.0
Status: RQ=31 SBA+ 64bit- FW- Rate=x1,x2
Command: RQ=0 SBA+ AGP+ 64bit- FW- Rate=x1
00:01.0 PCI bridge: Intel Corporation: Unknown device 1131 (rev 02) (prog-if 00 [Normal decode])
Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B-
Status: Cap- 66Mhz+ UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR-
Latency: 32
Bus: primary=00, secondary=01, subordinate=01, sec-latency=32
I/O behind bridge: 0000f000-00000fff
Memory behind bridge: d4000000-d7ffffff
Prefetchable memory behind bridge: d8000000-d9ffffff
BridgeCtl: Parity- SERR- NoISA+ VGA+ MAbort- >Reset- FastB2B-
00:1e.0 PCI bridge: Intel Corporation 82801BAM PCI (rev 02) (prog-if 00 [Normal decode])
Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B-
Status: Cap- 66Mhz- UDF- FastB2B+ ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR-
Latency: 0
Bus: primary=00, secondary=02, subordinate=02, sec-latency=32
I/O behind bridge: 0000c000-0000cfff
Memory behind bridge: da000000-dbffffff
Prefetchable memory behind bridge: fff00000-000fffff
BridgeCtl: Parity- SERR+ NoISA+ VGA- MAbort- >Reset- FastB2B-
00:1f.0 ISA bridge: Intel Corporation 82801BA ISA Bridge (ICH2) (rev 02)
Control: I/O+ Mem+ BusMaster+ SpecCycle+ MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B-
Status: Cap- 66Mhz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR-
Latency: 0
00:1f.1 IDE interface: Intel Corporation 82801BA IDE U100 (rev 02) (prog-if 80 [Master])
Control: I/O+ Mem- BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B-
Status: Cap- 66Mhz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR-
Latency: 0
Region 4: I/O ports at f000 [size=16]
00:1f.2 USB Controller: Intel Corporation 82801BA(M) USB (Hub A) (rev 02) (prog-if 00 [UHCI])
Control: I/O+ Mem- BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B-
Status: Cap- 66Mhz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR-
Latency: 0
Interrupt: pin D routed to IRQ 9
Region 4: I/O ports at d000 [size=32]
00:1f.3 SMBus: Intel Corporation 82801BA(M) SMBus (rev 02)
Control: I/O+ Mem- BusMaster- SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B-
Status: Cap- 66Mhz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR-
Interrupt: pin B routed to IRQ 9
Region 4: I/O ports at 5000 [size=16]
00:1f.4 USB Controller: Intel Corporation 82801BA(M) USB (Hub B) (rev 02) (prog-if 00 [UHCI])
Control: I/O+ Mem- BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B-
Status: Cap- 66Mhz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR-
Latency: 0
Interrupt: pin C routed to IRQ 9
Region 4: I/O ports at d800 [size=32]
01:00.0 VGA compatible controller: Matrox Graphics, Inc. MGA G400 AGP (rev 82) (prog-if 00 [VGA])
Subsystem: Matrox Graphics, Inc.: Unknown device 0542
Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B-
Status: Cap+ 66Mhz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR-
Latency: 32 (4000ns min, 8000ns max), cache line size 08
Interrupt: pin A routed to IRQ 10
Region 0: Memory at d8000000 (32-bit, prefetchable) [size=32M]
Region 1: Memory at d4000000 (32-bit, non-prefetchable) [size=16K]
Region 2: Memory at d5000000 (32-bit, non-prefetchable) [size=8M]
Expansion ROM at <unassigned> [disabled] [size=128K]
Capabilities: [dc] Power Management version 2
Flags: PMEClk- DSI+ D1- D2- AuxCurrent=0mA PME(D0-,D1-,D2-,D3hot-,D3cold-)
Status: D0 PME-Enable- DSel=0 DScale=0 PME-
Capabilities: [f0] AGP version 2.0
Status: RQ=31 SBA+ 64bit- FW- Rate=x1,x2
Command: RQ=31 SBA+ AGP+ 64bit- FW- Rate=x1
02:01.0 Multimedia audio controller: Ensoniq ES1370 [AudioPCI] (rev 01)
Subsystem: Unknown device 4942:4c4c
Control: I/O+ Mem- BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B-
Status: Cap- 66Mhz- UDF- FastB2B- ParErr- DEVSEL=slow >TAbort- <TAbort+ <MAbort+ >SERR- <PERR-
Latency: 32 (3000ns min, 32000ns max)
Interrupt: pin A routed to IRQ 9
Region 0: I/O ports at c000 [size=64]
02:03.0 Ethernet controller: Lite-On Communications Inc LNE100TX (rev 20)
Subsystem: Netgear FA310TX
Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B-
Status: Cap- 66Mhz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR-
Latency: 32
Interrupt: pin A routed to IRQ 10
Region 0: I/O ports at c400 [size=256]
Region 1: Memory at db000000 (32-bit, non-prefetchable) [size=256]
Expansion ROM at <unassigned> [disabled] [size=256K]
02:04.0 SCSI storage controller: Adaptec AHA-294x / AIC-7871
Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B-
Status: Cap- 66Mhz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR-
Latency: 32 (2000ns min, 2000ns max), cache line size 08
Interrupt: pin A routed to IRQ 11
Region 0: I/O ports at c800 [disabled] [size=256]
Region 1: Memory at db001000 (32-bit, non-prefetchable) [size=4K]
Expansion ROM at <unassigned> [disabled] [size=32K]
[7.6.] SCSI information (from /proc/scsi/scsi)
Attached devices:
Host: scsi0 Channel: 00 Id: 00 Lun: 00
Vendor: IBM Model: DORS-32160 Rev: S82C
Type: Direct-Access ANSI SCSI revision: 02
Host: scsi0 Channel: 00 Id: 04 Lun: 00
Vendor: PLEXTOR Model: CD-ROM PX-32CS Rev: 1.01
Type: CD-ROM ANSI SCSI revision: 02
[7.7.] Other information that might be relevant to the problem
(please look in /proc and include all information that you
think to be relevant):
Server (the oopsed one):
eth0: Lite-On 82c168 PNIC rev 32 at 0xd0965000, 00:A0:CC:D2:C7:52, IRQ 10.
(NetGear FA-310TX)
Reference server (against which iozone works; doesn't use LVM):
eth0: NatSemi DP8381[56] at 0xd09e8000, 00:02:e3:13:e3:18, IRQ 5.
(Presumably NetGear FA-311TX)
Client (running iozone):
eth0: Lite-On 82c168 PNIC rev 32 at 0xd0a2a000, 00:A0:CC:5A:09:30, IRQ 11.
(Presumably NetGear FA-310TX)
[X.] Other notes, patches, fixes, workarounds:
My limited understanding and tentative evidence point in the
direction of LVM being not completely innocent (maybe in conjunction
with the direct_io patches contained in Trond's NFS), but this is
pure conjecture. I'll CC: the report to Sistina, anyway.
--
"I use emacs, which might be thought of as a thermonuclear
word processor."
-- Neal Stephenson, "In the beginning... was the command line"
I received a patch from Sistina (thanks!) which does indeed fix the
oops occuring on the server. The patch apparently cleans up concurrent
usage of a _private buffer_head data field by ext3 and lvm. It does
*not*, however, alleviate the iozone error - that still occurs with
different semantics: iozone now exits cleanly after the i/o error is
displayed, NFS stays usable.
Trond: Is there anything I can do to get error messages/traces out of
the nfs layer? Or do analysis of the server (as it's fully usable
during/after the iozone run). Syslog (in full *.*) shows
nothing. Kudos for the patch btw - w/out I can't get write performance
better than 1.5MBps, with the patch it's an even 7.something MBps.
The iozone error reported below is 100% reproducible between those two
boxen.
Since the original report I've moved all mentioned machines to 2.4.18
(final, not -rc4) including Sistina's cleanup as mentioned above.
On a half-related note: I'm not subscribed to the nfs list and can't
subscribe to it without bending over backwards (the mail server
doesn't accept the confirmation mail targeted at it from an "dial-up"
(rather: dynamic-ip) account). No, the obvious simple solution is not
really viable.
Joachim Breuer <[email protected]> writes:
> [1.] One line summary of the problem:
>
> During performance test (using iozone) against nfs server with
> kernel 2.4.18-rc4 + linux-2.4.18-NFS_ALL.dif (provided against
> 2.4.18-rc2, went in cleanly) from nfs.sourceforge.net + Sistina's
> LVM2 beta1.1, Oops occurs.
>
> [2.] Full description of the problem/report:
>
> Client and Server running same aforementioned kernel, NFS parameters
> set to rsize==wsize==4096; udp. Exported FS is an ext3 on a LV on
> two PVs (linear/segmented, not striped), one is a complete SCSI disk
> (sda), the other is a partition of an IDE disk (hda5). "./iozone -ac
> -R -n 256m" showed results for write/rewrite/read/reread; showed
> "Error writing block at 219414528", "write: Input/output error",
> "iozone: interrupted" before random read result. Result "never"
> comes up (not in 15+ minutes), iozone appears hung (Ctrl-C won't
> break it, kill -9 does).
>
> Checking at the server shows oops detailed below, and high load
> (around 8, stays up even after iozone was killed). No processes on
> server show responsible for the load average in "top".
>
> Same iozone against other NFS server works (more than one iteration,
> this NFS server will be called "reference server" from here on). The
> reference server is different hardware (see next paragraph and
> [7.7]), esp. different ethernet controller. Reference server does
> *NOT* employ LVM; but *does* also use ext3.
>
> All boxen X86, server is a Celeron 900 (PIII-Core-based); client is
> a Pentium III 850; running identical kernels. Reference server is a
> dual Pentium Pro 200 SMP, using the same kernel modulo SMP turned
> on. More info on hardware available on request.
[Rest of original problem report, including setup/machine description,
in <[email protected]> posted on Sun, 03 Mar 2002 03:09:53 +0100]
So long,
Joe
--
"I use emacs, which might be thought of as a thermonuclear
word processor."
-- Neal Stephenson, "In the beginning... was the command line"