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From: "Peter Oruba" <peter.oruba@amd.com>
Organization: AMD
To: "Mircea Bardac" <dev.list@mircea.bardac.net>
Subject: Re: CPU off-on-off: lost CPU management?
Date: Wed, 6 Jun 2007 13:50:20 +0200
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I'm sorry, I am not able to reproduce this issue (using 2.6.21.3). Everythi=
ng=20
works fine on my Turion laptop. It looks like there is also CPU hotplug=20
involved in that issue, since brining cpu1 back on doesn't update siblings=
=20
and cpu_cores in /proc/cpuinfo as well. Can you specify more details about=
=20
the system you are using? Have you tried enabling CONFIG_CPU_FREQ_DEBUG and=
=20
booting with "cpufreq.debug=3D7"?

Peter Oruba


Am Dienstag, 5. Juni 2007 11:56:44 schrieb Mircea Bardac:
> On Tuesday 05 June 2007 12:52:59 Mircea Bardac wrote:
> > Hi Peter,
> >
> > This time with Kernel 2.6.21.3.
> >
> > [...]
> >
> > # echo 1 > /sys/devices/system/cpu/cpu1/online
> >
> > # cat /proc/cpuinfo
> > processor       : 0
> > vendor_id       : AuthenticAMD
> > cpu family      : 15
> > model           : 72
> > model name      : AMD Turion(tm) 64 X2 Mobile Technology TL-52
> > stepping        : 2
> > cpu MHz         : 800.000
> > cache size      : 512 KB
> > physical id     : 0
> > siblings        : 1
> > core id         : 0
> > cpu cores       : 1
> > fdiv_bug        : no
> > hlt_bug         : no
> > f00f_bug        : no
> > coma_bug        : no
> > fpu             : yes
> > fpu_exception   : yes
> > cpuid level     : 1
> > wp              : yes
> > flags           : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge
> > mca cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext
> > fxsr_opt rdtscp lm 3dnowext 3dnow pni cx16 lahf_lm cmp_legacy svm extap=
ic
> > cr8legacy ts fid vid ttp tm stc
> > bogomips        : 1597.67
> > clflush size    : 64
> >
> > processor       : 1
> > vendor_id       : AuthenticAMD
> > cpu family      : 15
> > model           : 72
> > model name      : AMD Turion(tm) 64 X2 Mobile Technology TL-52
> > stepping        : 2
> > cpu MHz         : 798.015
> > fdiv_bug        : no
> > hlt_bug         : no
> > f00f_bug        : no
> > coma_bug        : no
> > fpu             : yes
> > fpu_exception   : yes
> > cpuid level     : 1
> > wp              : yes
> > flags           : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge
> > mca cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext
> > fxsr_opt rdtscp lm 3dnowext 3dnow pni cx16 lahf_lm cmp_legacy svm extap=
ic
> > cr8legacy ts fid vid ttp tm stc
> > bogomips        : 1596.26
> > clflush size    : 64
>
> As a follow-up:
>
> As Stefan noticed initially, the CPU frequency of the 2nd CPU is different
> after the CPU is brought back online.
>
> Mircea


=2D-=20
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