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SubjectRe: Performance of -mm2 and -mm4
> Martin J. Bligh wrote:
>
>> 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-mm1 44.26 87.71 574.73 1496.33
>> 2.6.8.1-mm2 44.27 90.27 574.84 1502.33
>> 2.6.8.1-mm4 45.87 97.60 595.23 1510.00
>>
>> mm2 seems to take slightly (but consistently) more systime than mm1, and
>> mm4 is significantly worse still ;-(
>>
>>
>
> Increasing base_timeslice here takes about 10s off the user time,
> and maybe 1-2 off elapsed. You may see a better improvement because
> the machine I'm testing on has very small caches; I assume you are
> using a 32-way NUMAQ with 1-2MB caches?

16-way with 2MB caches. Doing 256 as opposed to 64 gives a little less
user time, more systime at the low end, and a wash with more tasks.
Not much affects elapsed though. I'll try 16, then backing out the
sched patch, and what Jesse suggested as well.

M.

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