linux-kernel - Re: SMP Affinity and nice

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Message-ID: <44ED0121.5080702@bigpond.net.au>
Date:	Thu, 24 Aug 2006 11:30:09 +1000
From:	Peter Williams <pwil3058@...pond.net.au>
To:	Rich Paredes <rparedes@...il.com>
CC:	Jan Engelhardt <jengelh@...ux01.gwdg.de>,
	linux-kernel@...r.kernel.org
Subject: Re: SMP Affinity and nice

Jan Engelhardt wrote:
>> Subject: SMP Affinity and nice
>>
>> I am trying to come to an understanding as to why 1 process is getting
>> less cpu time than identical processes with a higher "nice" value.
>> Server has 2 physical processors with hyperthreading (cpu 0,1,2,3)
>>
>> I am starting 5 processes that perform a square root loop to max out a
>> cpu.  They use the exact same code but are renamed for identification:
>> cpumax1, cpumax2, cpumax3, cpumax4, cpumax5
> [...]
> 
> What you describe should be addressed in the -ck patchset (smpnice-...diff) 
> Not sure if it is in mainline already, though.

It's coming in 2.6.18.

Rich,
	What kernel version are you using when you see this phenomenon?

Peter
-- 
Peter Williams                                   pwil3058@...pond.net.au

"Learning, n. The kind of ignorance distinguishing the studious."
  -- Ambrose Bierce
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