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

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Message-ID: <20070523040650.GS19966@holomorphy.com>
Date:	Tue, 22 May 2007 21:06:50 -0700
From:	William Lee Irwin III <wli@...omorphy.com>
To:	Con Kolivas <kernel@...ivas.org>
Cc:	Bill Davidsen <davidsen@....com>,
	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.

On Thu, May 24, 2007 at 10:36:44AM +1000, Con Kolivas wrote:
> 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.

Maybe people should explicitly hack on sched_yield() for these things
and do comparative benchmarking of sched_yield() implementations.


-- wli
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