linux-kernel - Re: [ck] [PATCH] sched: staircase deadline misc fixes

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Message-Id: <200704010840.11387.prakash@punnoor.de>
Date:	Sun, 1 Apr 2007 08:40:07 +0200
From:	Prakash Punnoor <prakash@...noor.de>
To:	ck@....kolivas.org
Cc:	linux list <linux-kernel@...r.kernel.org>
Subject: Re: [ck] [PATCH] sched: staircase deadline misc fixes

Am Mittwoch 28 März 2007 schrieb Prakash Punnoor:
> Am Mittwoch 28 März 2007 schrieb Con Kolivas:
> > I'm cautiously optimistic that we're at the thin edge of the bugfix wedge
> > now.
> >
> > ---
> > set_load_weight() should be performed after p->quota is set. This fixes a
> > large SMP performance regression.
>
> Hi, I am using 2.6.21-rc5 with rsdl 0.37 and think I still see a regression
> with my Athlon X2. Namely using this ac3 encoder
> (http://aften.sourceforge.net/), which I parallelized in a simple way, with
> my test sample I remember having encoding times of ~5.4sec with vanilla and
> ~5.8 sec with rsdl - once the whole test wave is in cache. Otherwise you
> can easily I/O limit the encoder. ;-) You need to get sources from svn
> though. The current 0.06 release doesn't have threads support.

BTW, I confirmed this regression. With vanilla 2.76.21-rc5 I get back my 5.4 
secs with the test sample and two threads. Furtmermore for me vanilla 
actually feels nicer on my dual core, even with load - just subjectively 
that's why I ditched rsdl...

Cheers,
-- 
(°=                 =°)
//\ Prakash Punnoor /\\
V_/                 \_V

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