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Message-ID: <2c0942db0704191226t21d3dae1lb0fa99bcd9714cf2@mail.gmail.com>
Date: Thu, 19 Apr 2007 12:26:03 -0700
From: "Ray Lee" <madrabbit@gmail.com>
Reply-To: ray-gmail@madrabbit.org
To: "Con Kolivas" <kernel@kolivas.org>
Subject: Re: Renice X for cpu schedulers
Cc: "Ingo Molnar" <mingo@elte.hu>, "Andrew Morton" <akpm@linux-foundation.org>,
       "Nick Piggin" <npiggin@suse.de>,
       "Linus Torvalds" <torvalds@linux-foundation.org>,
       "Matt Mackall" <mpm@selenic.com>,
       "William Lee Irwin III" <wli@holomorphy.com>,
       "Peter Williams" <pwil3058@bigpond.net.au>,
       "Mike Galbraith" <efault@gmx.de>, "ck list" <ck@vds.kolivas.org>,
       "Bill Huey" <billh@gnuppy.monkey.org>, linux-kernel@vger.kernel.org,
       "Arjan van de Ven" <arjan@infradead.org>,
       "Thomas Gleixner" <tglx@linutronix.de>
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On 4/19/07, Con Kolivas <kernel@kolivas.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