linux-kernel - Re: Renice X for cpu schedulers

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Message-ID: <alpine.LFD.0.98.0704191824090.9964@woody.linux-foundation.org>
Date:	Thu, 19 Apr 2007 18:27:41 -0700 (PDT)
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Ed Tomlinson <edt@....ca>
cc:	Mark Lord <lkml@....ca>, Con Kolivas <kernel@...ivas.org>,
	Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Nick Piggin <npiggin@...e.de>, Matt Mackall <mpm@...enic.com>,
	William Lee Irwin III <wli@...omorphy.com>,
	Peter Williams <pwil3058@...pond.net.au>,
	Mike Galbraith <efault@....de>, ck list <ck@....kolivas.org>,
	Bill Huey <billh@...ppy.monkey.org>,
	linux-kernel@...r.kernel.org,
	Arjan van de Ven <arjan@...radead.org>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: Renice X for cpu schedulers

On Thu, 19 Apr 2007, Ed Tomlinson wrote:
> > 
> > SD just doesn't do nearly as good as the stock scheduler, or CFS, here.
> > 
> > I'm quite likely one of the few single-CPU/non-HT testers of this stuff.
> > If it should ever get more widely used I think we'd hear a lot more complaints.
> 
> amd64 UP here.  SD with several makes running works just fine.

The thing is, it probably depends *heavily* on just how much work the X 
server ends up doing. Fast video hardware? The X server doesn't need to 
busy-wait much. Not a lot of eye-candy? The X server is likely fast enough 
even with a slower card that it still gets sufficient CPU time and isn't 
getting dinged by any balancing. DRI vs non-DRI? Which window manager 
(maybe some of the user-visible lags come from there..) etc etc.

Anyway, I'd ask people to look a bit at the current *regressions* instead 
of spending all their time on something that won't even be merged before 
2.6.21 is released, and we thus have some mroe pressing issues. Please?

			Linus
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