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SubjectRe: Performance of -mm2 and -mm4
>>>> The -mm4 looks more like sched stuff to me (copy_to/from_user, etc),
>>>> but the -mm2 stuff looks like something else. Buggered if I know what.
>>>> -mm3 didn't compile cleanly, so I didn't bother, but I prob can if you
>>>> like.
>>>>
>>>
>>> If you suspect the scheduler, you could try bumping SD_NODES_PER_DOMAIN in
>>> kernel/sched.c to a larger value (e.g. the number of nodes in your system).
>>> That'll make the scheduler balance more aggressively across the whole system.
>>>
>>>
>>
>> Try increasing /proc/sys/kernel/base_timeslice as well.
>
> Or back out nicksched.patch

Yeah, that mostly fixed it.

Kernbench: (make -j N vmlinux, where N = 16 x num_cpus)
Elapsed System User CPU
2.6.8.1 44.82 97.19 574.55 1497.33
2.6.8.1-mm4 46.82 107.47 594.15 1497.33
2.6.8.1-mm4-nn 44.93 96.33 576.44 1496.33

Kernbench: (make -j vmlinux, maximal tasks)
Elapsed System User CPU
2.6.8.1 43.90 87.76 572.94 1505.67
2.6.8.1-mm4 45.87 97.60 595.23 1510.00
2.6.8.1-mm4-nn 44.53 90.71 575.68 1495.67

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