On 10/14/2010 05:58 PM, Jesse Keating wrote:
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> On 10/14/2010 04:49 PM, John Poelstra wrote:
>> That's what's so mysterious, very little CPU time or activity.
>
> I saw this at one point, and the kernel folks found it to be a load
> balancing thing gone awry in the kernel.
>
> 2.6.35.6-33.rc1 seems to include a patch:
>
> - - Add sched-35-increment-cache_nice_tries-only-on-periodic-lb.patch,
> another fix for excessive scheduler load balancing.
>
> That should be in kernel-2.6.35.6-39.fc14, which is in dist-f14. My
> load went down and the laptop (also an M1330) has cooled down a bit, but
> it is still above one usually.
With 2.6.35.6-43.fc14.i686.PAE, after letting the machine quiet down a bit
after logging in and starting up Firefox and Thunderbird:
top - 10:45:59 up 8 min, 14 users, load average: 0.81, 1.65, 1.12
Tasks: 184 total, 2 running, 182 sleeping, 0 stopped, 0 zombie
Cpu(s): 2.0%us, 0.8%sy, 0.0%ni, 97.0%id, 0.2%wa, 0.0%hi, 0.0%si, 0.0%st
Top causes for wakeups:
40.6% (117.7) [kernel scheduler] Load balancing tick
29.8% ( 86.4) firefox
5.9% ( 17.1) konsole
5.4% ( 15.6) PS/2 keyboard/mouse/touchpad interrupt
3.7% ( 10.7) thunderbird-bin
3.6% ( 10.5) [ata_piix] <interrupt>
Actually moving the mouse and typing seems to bring the load back up to 1.
Never saw it go below .8
--
Orion Poplawski
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