Re: CPU off-on-off: lost CPU management?

[Mircea Bardac <dev.list@mircea.bardac.net>]

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 extapic 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 extapic 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