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SubjectRe: 2.6.9-rc1-mm4
Martin J. Bligh wrote:
>>>Well, the good news is that it compiles now, and without forcing ACPI on.
>>> Yay!
>>
>>Does it boot?
>
>
> Yup. Performance is the same as other -mm's (scheduler changes bring it
> down from mainline quite a bit, but otherwise OK).
>
> Kernbench: (make -j N vmlinux, where N = 16 x num_cpus)
> Elapsed System User CPU
> 2.6.9-rc1 44.97 98.66 576.77 1501.33
> 2.6.9-rc1-mm1 46.92 107.27 594.10 1493.67
> 2.6.9-rc1-mm2 46.95 107.80 593.65 1493.33
> 2.6.9-rc1-mm4 46.93 108.91 593.19 1495.00
>

I'm looking into this performance thing a bit now (although I think
Andrew is going to drop nicksched from the next mm).

It doesn't seem to be from lack of timeslice: with the default
timeslice, nicksched gives average timeslices for a make -j vmlinux
roughly the same size as those for the 2.6 scheduler (22ms).

Increasing base_timeslice can get it up to more than 25% (28ms) larger,
but it still isn't as quick.

I suspect it may be unfairness in the 2.6 scheduler improving cache
utilisation. Need to find a way to measure that though :P
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