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

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Date:	Wed, 23 May 2007 07:23:23 +0200
From:	Michael Gerdau <mgd@...hnosis.de>
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

> 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.

While I can't comment on the technical/implementational details of
Con's claim I definitely have to agree from a users POV.

All my recent CPU intensive benchmarks show that both ck/sd and cfs
are very decent scheduler and IMO superior to mainline for all _my_
usecases. In particular playing supertux while otherwise fully utilizing
both CPUs on a dualcore works without any glitch and better than
on mainline for both sd and cfs.

For me the huge difference you have for sd to the others increases the
likelyhood the glxgears benchmark does not measure scheduling of graphic
but something else.

Anyway, I'm still in the process of collecting data or more precisely
until recently constantly refined what data to collect and how. I plan
to provide new benchmark results on CPU intensive tasks in a couple of
days.

Best,
Michael
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