linux-kernel - Re: BFS vs. mainline scheduler benchmarks and measurements

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Message-Id: <200909102319.36524.Martin@lichtvoll.de>
Date:	Thu, 10 Sep 2009 23:19:36 +0200
From:	Martin Steigerwald <Martin@...htvoll.de>
To:	linux-kernel@...r.kernel.org
Subject: Re: BFS vs. mainline scheduler benchmarks and measurements

Am Donnerstag 10 September 2009 schrieb Ingo Molnar:
> * Martin Steigerwald <Martin@...htvoll.de> wrote:
> > Am Donnerstag 10 September 2009 schrieb Ingo Molnar:
> > > * Martin Steigerwald <Martin@...htvoll.de> wrote:
> > > > Am Mittwoch 09 September 2009 schrieb Peter Zijlstra:
> > > > > On Wed, 2009-09-09 at 12:05 +0300, Nikos Chantziaras wrote:
> > > > > > Thank you for mentioning min_granularity.  After:
> > > > > >
> > > > > >    echo 10000000 > /proc/sys/kernel/sched_latency_ns
> > > > > >    echo 2000000 > /proc/sys/kernel/sched_min_granularity_ns
> > > > >
> > > > > You might also want to do:
> > > > >
> > > > >      echo 2000000 >
> > > > > /proc/sys/kernel/sched_wakeup_granularity_ns
> > > > >
> > > > > That affects when a newly woken task will preempt an already
> > > > > running task.
> > > >
> > > > Heh that scheduler thing again... and unfortunately Col appearing
> > > > to feel hurt while I am think that Ingo is honest on his offer on
> > > > collaboration...
> > > >
> > > > While it makes fun playing with that numbers and indeed
> > > > experiencing subjectively a more fluid deskopt how about just a
> > > >
> > > > echo "This is a f* desktop!" > /proc/sys/kernel/sched_workload
> > >
> > > No need to do that, that's supposed to be the default :-) The knobs
> > > are really just there to help us make it even more so - i.e. you
> > > dont need to tune them. But it really relies on people helping us
> > > out and tell us which combinations work best ...
> >
> > Well currently I have:
> >
> > shambhala:/proc/sys/kernel> grep "" sched_latency_ns
> > sched_min_granularity_ns sched_wakeup_granularity_ns
> > sched_latency_ns:100000
> > sched_min_granularity_ns:200000
> > sched_wakeup_granularity_ns:0
> >
> > And this give me *a completely different* desktop experience.
> 
> what is /debug/sched_features - is NO_NEW_FAIR_SLEEPERS set? If not
> set yet then try it:
> 
>   echo NO_NEW_FAIR_SLEEPERS > /debug/sched_features
> 
> that too might make things more fluid.

Hmmm, need to mount that first. But not today, cause I have to dig out on 
how to do it. Have to pack some things for tomorrow. And then sleep time.

Ciao,
-- 
Martin 'Helios' Steigerwald - http://www.Lichtvoll.de
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