Re: Performance of -mm2 and -mm4

[Martin J. Bligh]

> 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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