Re: Performance of -mm2 and -mm4

[Nick Piggin]

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?

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