Re: HyperThreading, kernel 2.6.10, 1 logical CPU idle !!

[Boris Fersing]

Robert Hancock a Ãcrit :

> Boris Fersing wrote:
>
>> Hi there,
>> I've a p4 HT 3,06Ghz, I've HT enabled in the BIOS and in the kernel :
>>
>> Linux electron 2.6.10-cj5 #6 SMP Fri Mar 4 02:18:08 CET 2005 i686 Mobile
>> Intel(R) Pentium(R) 4     CPU 3.06GHz GenuineIntel GNU/Linux .
>>
>> But it seems that one of my cpus is idle (gkrellm monitor or top) :
>>
>> Cpu0  : 88.0% us, 12.0% sy,  0.0% ni,  0.0% id,  0.0% wa,  0.0% hi,
>> 0.0% si
>> Cpu1  :  0.0% us,  0.3% sy,  0.0% ni, 99.7% id,  0.0% wa,  0.0% hi,
>> 0.0% si
>>
>>
>> I'm actually compiling thunderbird with MAKEOPTS="-j3", so , the second
>> should be used, shouldn't it ?
>
>
> Are you sure that it is actually compiling multiple files at once?
>
Yes I'm sure, Even if I launch more than 1 gcc, or for example, start a
compilation + video encoding (mencoder) + ... the second CPU won't work
(idle 100% or sometimes 99,9%).

Regards,

Boris.
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