Re: [PATCH] Minor scheduler fix to get rid of skipping in xmms

[Nick Piggin]

Andrew Morton wrote:

> Nick Piggin <piggin@xxxxxxxxxxxxxxx> wrote:
>
> > So it is quite sad that the scheduler in 2.6 is
> > sitting there doing nothing but waiting to be obsoleted, while Con's
> > good (and begnin) scheduler patches are waiting around and getting
> > less than 1% of the testing they need.
>
> My concern is the (large) performance regression with specjbb and
> volanomark, due to increased idle time.
>
> We cannot just jam all this code into Linus's tree while crossing our
> fingers and hoping that something will turn up to fix this problem. 
> Because we don't know what causes it, nor whether we even _can_ fix it.
>
> So this is the problem which everyone who is working on the CPU scheduler
> should be concentrating on, please.

IIRC my (equivalent to Andrew's CAN_MIGRATE) patch fixed this. There was 
still a small (~8%?) performance regression, but idle times were on par 
with -linus. I don't have easy access to a largeish NUMA box, so I
can't do much more.


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