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

Mircea Bardac
2007-06-05T10:13:15Z

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