linux-kernel - Re: [ck] Re: SD still better than CFS for 3d ?(was Re: 2.6.23-rc1)

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Message-Id: <200707311723.51387.elmig@debianpt.org>
Date:	Tue, 31 Jul 2007 17:23:51 +0100
From:	Miguel Figueiredo <elmig@...ianpt.org>
To:	"Matthew Hawkins" <darthmdh@...il.com>
Cc:	ck@....kolivas.org,
	"Linux Kernel Mailing List" <linux-kernel@...r.kernel.org>,
	"Kasper Sandberg" <lkml@...anurb.dk>
Subject: Re: [ck] Re: SD still better than CFS for 3d ?(was Re: 2.6.23-rc1)

Em Terça, 31 de Julho de 2007 16:57, Matthew Hawkins escreveu:
> On 7/31/07, Miguel Figueiredo <elmig@...ianpt.org> wrote:
> > CFS does not requeue_task() on SCHED_YIELD (used by graphic drivers) as
> > until 2.6.22 and -ck. Please try this hack [1] that makes -ck to behave
> > like CFS then you are comparing apples to apples.
>
> Hi Miguel,
>
> I tested with sched_yield_ctl set to 1
>
> 2.6.22.1-ck+sched_yield_hack
> 0   51
> 1   51
> 2   51
> 3   46
> 4   38
> 5   38
> 6   38
> 7   30
> 8   27
> 9   22
> 10   20
>
> After getting the numbers on all setups with the 10 loops still
> running I went for a run around the map (I used the "aggressor" map,
> if anyone cares).  CFS was noticeably smoother (despite the small
> framerate differences).  ie CFS was bordering on barely playable,
> whereas the above test it wasn't really playable (felt like playing on
> a lagged server).  Even plain -ck was better (going for a run, the FPS
> jumped from ~2 to 15).  I've noticed messing with sched_yield tends to
> cause strange defects in the past...

Have you tryied the 2 modes of the patch?

-- 

Com os melhores cumprimentos/Best regards,

Miguel Figueiredo
http://www.DebianPT.org
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