Re: [PATCH] sched.c: Be a bit more conservative in SMP

Antonio Vargas
2006-09-19T17:50:47Z

On 9/19/06, Ludovic Drolez <ldrolez@linbox.com> wrote:
> Vincent Pelletier <vincent.plr <at> wanadoo.fr> writes:
> > I'll do some tests soon to see which version gives better performance at a
> > higher level than just process migration cost - if different at all.
>
> I think that your patch should improve the performance because process
> migrations are expensive (cache miss) and should be avoided when not
> really necessary.
>
> Cheers,
>
> Ludovic.
>

A variant on this theme would be (not tested or somewhat, just a
random idea for considering):

1. find if the process is a cpu-hog, if not then ignore

2. find somehow how much time has this process on it's current cpu

3. then, instead of always substracting 1 from th current load on the
current cpu, substract for example 1...0 when running from 0 to 60
seconds... this way cpu hogs would only rotate slowly?

in code:

number_to_sub_from_queue_load = (256 - min(256,
time_from_last_change_of_cpu)) >> 8;

somehow managing to get fixedpoint loadlevels on the runqueues would
make this work better....

--
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