linux-kernel - Re: Sched - graphic smoothness under load

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Date:	Thu, 24 May 2007 10:36:44 +1000
From:	Con Kolivas <kernel@...ivas.org>
To:	Bill Davidsen <davidsen@....com>
Cc:	Miguel Figueiredo <elmig@...ianpt.org>,
	Ray Lee <ray-lk@...rabbit.org>,
	Linux Kernel M/L <linux-kernel@...r.kernel.org>
Subject: Re: Sched - graphic smoothness under load - cfs-v13 sd-0.48

On Wednesday 23 May 2007 10:28, Bill Davidsen wrote:
> > kernel    2.6.21-cfs-v13    2.6.21-ck2
> > a)    194464        254669
> > b)    54159        124
>
> Everyone seems to like ck2, this makes it look as if the video display
> would be really pretty unusable. While sd-0.48 does show an occasional
> video glitch when watching video under heavy load, it's annoying rather
> than unusable.

That's because the whole premise of your benchmark relies on a workload that 
yield()s itself to the eyeballs on most graphic card combinations when using 
glxgears. Your test remains a test of sched_yield in the presence of your 
workloads rather than anything else. If people like ck2 it's because in the 
real world with real workloads it is better, rather than on a yield() based 
benchmark. Repeatedly the reports are that 3d apps and games in normal usage 
under -ck are better than mainline and cfs.

--
-ck
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