linux-kernel - Re: RSDL v0.31

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Message-Id: <1174112768.3144.8.camel@entropy>
Date:	Fri, 16 Mar 2007 23:26:08 -0700
From:	Nicholas Miell <nmiell@...cast.net>
To:	Mike Galbraith <efault@....de>
Cc:	Con Kolivas <kernel@...ivas.org>, ck@....kolivas.org,
	Ingo Molnar <mingo@...e.hu>, Al Boldi <a1426z@...ab.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: RSDL v0.31

On Sat, 2007-03-17 at 06:56 +0100, Mike Galbraith wrote:
> On Fri, 2007-03-16 at 21:24 -0700, Nicholas Miell wrote:
> 
> > Sorry, I haven't really been following this thread and now I'm confused.
> > 
> > You're saying that it's somehow the scheduler's fault that X isn't
> > running with a high enough priority?
> 
> I'm saying that the current scheduler adjusts for interactive loads,
> this new one doesn't.  I'm seeing interactivity regressions, and they
> are not fixed with nice unless nice is used to maximum effect.  I'm
> saying yes, I can lower my expectations, but no I don't want to.
> 
> A four line summary is as short as I can make it.
> 
> 	-Mike

Uh, no. Essentially, the current scheduler works around X's brokenness,
in an often unpredictable manner.

RSDL appears to be completely deterministic, which is a very strong
virtue.

The X people have plans for how to go about fixing this, but until then,
there's no reason to hold up kernel development.

-- 
Nicholas Miell <nmiell@...cast.net>

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