Re: [sched, patch] better wake-balancing, #2

Ingo Molnar
2005-07-31T06:29:27Z

* Chuck Ebbert <76306.1226@compuserve.com> wrote:

> On Fri, 29 Jul 2005 at 17:02:07 +0200, Ingo Molnar wrote:
>
> > do wakeup-balancing only if the wakeup-CPU is idle.
> >
> > this prevents excessive wakeup-balancing while the system is highly
> > loaded, but helps spread out the workload on partly idle systems.
>
> I tested this with Volanomark on dual-processor PII Xeon -- the
> results were very bad:

which patch have you tested? The mail you replied to above is for patch
#2, while on SMT/HT boxes it's patch #3 that is the correct approach.

furthermore, which base kernel have you applied the patch to? Best would
be to test the following kernels:

2.6.13-rc4 + sched-rollup
2.6.13-rc4 + sched-rollup + better-wake-balance-#3

the sched-rollup and the latest better-wake-balance patches can be found
at:

http://redhat.com/~mingo/scheduler-patches/

(sched-rollup is the current scheduler patch-queue in -mm. And if you
have time, it would also be nice to have a 2.6.13-rc4 baseline for
VolanoMark, and perhaps a 2.6.12 measurement too, so that we can see how
things changed.)

Ingo