linux-kernel - Re: Renice X for cpu schedulers

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Message-ID: <2c0942db0704191226t21d3dae1lb0fa99bcd9714cf2@mail.gmail.com>
Date:	Thu, 19 Apr 2007 12:26:03 -0700
From:	"Ray Lee" <madrabbit@...il.com>
To:	"Con Kolivas" <kernel@...ivas.org>
Cc:	"Ingo Molnar" <mingo@...e.hu>,
	"Andrew Morton" <akpm@...ux-foundation.org>,
	"Nick Piggin" <npiggin@...e.de>,
	"Linus Torvalds" <torvalds@...ux-foundation.org>,
	"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 4/19/07, Con Kolivas <kernel@...ivas.org> wrote:
> The one fly in the ointment for
> linux remains X. I am still, to this moment, completely and utterly stunned
> at why everyone is trying to find increasingly complex unique ways to manage
> X when all it needs is more cpu[1].
[...and hence should be reniced]

The problem is that X is not unique. There's postgresql, memcached,
mysql, db2, a little embedded app I wrote... all of these perform work
on behalf of another process. It's just most *noticeable* with X, as
pretty much everyone is running that.

If we had some way for the scheduler to decide to donate part of a
client process's time slice to the server it just spoke to (with an
exponential dampening factor -- take 50% from the client, give 25% to
the server, toss the rest on the floor), that -- from my naive point
of view -- would be a step toward fixing the underlying issue. Or I
might be spouting crap, who knows.

The problem is real, though, and not limited to X.

While I have the floor, thank you, Con, for all your work.

Ray
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