HyperThreading, kernel 2.6.10, 1 logical CPU idle !!

HyperThreading, kernel 2.6.10, 1 logical CPU idle !!

[Boris Fersing]

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 ?

Is that a kernel issue ? Could you please explain me what's happening ?

Thank you !

Boris.

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

[Coywolf Qi Hunt]

It seems the problem was already solved.Try the latest mm tree: 2.6.12-rc3-mm2.

FYI:
sched2-fix-smt-scheduling-problems-fix.patch
sched2-fix-smt-scheduling-problems.patch


On 5/1/05, Boris Fersing <mastermac@free.fr> wrote:
> I disabled SMT in the kernel config and yet it seems to work ...
> 
> Boris.
> 
> Le samedi 30 avril 2005 à 23:37 +0200, Boris Fersing a écrit :
> > Robert Hancock a écrit :
> >
> > > 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.



-- 
Coywolf Qi Hunt
http://sosdg.org/~coywolf/

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

[Boris Fersing]

I disabled SMT in the kernel config and yet it seems to work ...

Boris.

Le samedi 30 avril 2005 à 23:37 +0200, Boris Fersing a écrit :
> Robert Hancock a écrit :
> 
> > 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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Re: HyperThreading, kernel 2.6.10, 1 logical CPU idle !!

[Boris Fersing]

Robert Hancock a écrit :

> 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.

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

[Robert Hancock]

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?

-- 
Robert Hancock      Saskatoon, SK, Canada
To email, remove "nospam" from hancockr@nospamshaw.ca
Home Page: http://www.roberthancock.com/