linux-kernel - Re: RSDL v0.31

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Message-Id: <1174467329.22159.3.camel@localhost>
Date:	Wed, 21 Mar 2007 09:55:29 +0100
From:	Kasper Sandberg <lkml@...anurb.dk>
To:	ray-gmail@...rabbit.org
Cc:	Mark Lord <lkml@....ca>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Xavier Bestel <xavier.bestel@...e.fr>,
	Al Boldi <a1426z@...ab.com>, Mike Galbraith <efault@....de>,
	Con Kolivas <kernel@...ivas.org>, ck@....kolivas.org,
	Serge Belyshev <belyshev@...ni.sinp.msu.ru>,
	Ingo Molnar <mingo@...e.hu>, linux-kernel@...r.kernel.org,
	Nicholas Miell <nmiell@...cast.net>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: RSDL v0.31

On Tue, 2007-03-20 at 08:16 -0700, Ray Lee wrote:
> On 3/20/07, Mark Lord <lkml@....ca> wrote:
> > I've droppped it from my machine -- interactive response is much
> > more important for my primary machine right now.
> 
> Help out with a data point? Are you running KDE as well? If you are,
> then it looks like the common denominator that RSDL is handling poorly
> is client-server communication. (KDE's KIO slaves in this case, but X
> in general.)

im not experiencing any problems with KDE. if anything ktorrent seems to
be going a teeny tiny bit smoother, though its nothing i can back up
with data.

now i havent tested ALL kioslaves yet, but stuff like sftp, fish, tar
and such works just as good.


> 
> If so, one would hope that a variation on Linus's 2.5.63 pipe wakeup
> pass-the-interactivity idea could work here. The problem with that
> original patch, IIRC, was that a couple of tasks could bounce their
> interactivity bonus back and forth and thereby starve others. Which
> might be expected given there was no 'decaying' of the interactivity
> bonus, which means you can make a feedback loop.
> 
> Anyway, looks like processes that do A -> B -> A communication chains
> are getting penalized under RSDL. In which case, perhaps I can make a
> test case that exhibits the problem without having to have the same
> graphics card or desktop as you.
An easy-to-reproduce testcase would be good.

> 
> Ray
> -
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