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

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Message-Id: <200909121027.08244.volkerarmin@googlemail.com>
Date:	Sat, 12 Sep 2009 10:27:08 +0200
From:	Volker Armin Hemmann <volkerarmin@...glemail.com>
To:	Nikos Chantziaras <realnc@...or.de>
Cc:	Ingo Molnar <mingo@...e.hu>, Jens Axboe <jens.axboe@...cle.com>,
	Mike Galbraith <efault@....de>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Con Kolivas <kernel@...ivas.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: BFS vs. mainline scheduler benchmarks and measurements

Hi,

On Samstag 12 September 2009, Nikos Chantziaras wrote:
> (Volker stripped all CCs from his posts; I restored them manually.)

stripping is not entirely correct. marc does not list all recipients ;)
Thank you.

> 
> On 09/11/2009 09:33 PM, Volker Armin Hemmann wrote:
> > Hi,
> >
> > this is with 2.6.31+reiser4+fglrx
> > Phenom II X4 955
> >
> > KDE 4.3.1, composite temporary disabled.
> > tvtime running.
> >
> > load:
> > fat emerge with make -j5 running in one konsole tab (xulrunner being
> > compiled).
> >
> > without NO_NEW_FAIR_SLEEPERS:
> >
> > tvtime is smooth most of the time
> >
> > with NO_NEW_FAIR_SLEEPERS:
> >
> > tvtime is more jerky. Very visible in scenes with movement.
> 
> Is the make -j5 running niced 0? 

yes. It always is.


> If yes, that would be actually the
> correct behavior. 

maybe. But I do not complain about jerks at all. I have 

[ 3618.305918] hpet1: lost 1 rtc interrupts

with tvtime running since I switched cpus - so something is wrong anyway.

I just wanted to report that for _me_ the behaviour is worse with 
NO_NEW_FAIR_SLEEPERS and plain 2.6.31.

I tried it yesterday when the firefox update came in and I switched between 
NO_NEW_FAIR... and NEW_FAIR... several times and with NO_NEW_FAIR... tvtime 
was just _more_ jerky, I am not saying that it wasn't jerky without it nor do 
I complain about it at all. ;)

Glück Auf,
Volker
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