linux-kernel - Re: 2.6.21-rc3-mm1 RSDL results

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Date:	Sat, 10 Mar 2007 12:02:25 +1100
From:	Con Kolivas <kernel@...ivas.org>
To:	Willy Tarreau <w@....eu>
Cc:	Matt Mackall <mpm@...enic.com>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	akpm@...ux-foundation.org
Subject: Re: 2.6.21-rc3-mm1 RSDL results

On Saturday 10 March 2007 09:12, Con Kolivas wrote:
> On Saturday 10 March 2007 08:57, Willy Tarreau wrote:
> > On Fri, Mar 09, 2007 at 03:39:59PM -0600, Matt Mackall wrote:
> > > On Sat, Mar 10, 2007 at 08:19:18AM +1100, Con Kolivas wrote:
> > > > On Saturday 10 March 2007 08:07, Con Kolivas wrote:
> > > > > On Saturday 10 March 2007 07:46, Matt Mackall wrote:

> > > 5x memload: good
> > > 5x execload: good
> > > 5x forkload: good
> > > 5 parallel makes: mostly good
> > > make -j 5: bad
> > >
> > > So what's different between makes in parallel and make -j 5? Make's
> > > job server uses pipe I/O to control how many jobs are running.
> >
> > Matt, could you check with plain 2.6.20 + Con's patch ? It is possible
> > that he added bugs when porting to -mm, or that someting in -mm causes
> > the trouble. Your experience with -mm seems so much different from mine
> > with mainline, there must be a difference somewhere !
>
> Good idea.

It's all very odd Matt. It really isn't behaving anything like you describe 
for myself or others. It sounds more like a real bug than what the design 
would do at all. The only things that are different on yours is Beryl and a 
different graphics card. When you're comparing to mainline are you 
comparing -mm1 to -mm2 to ensure something else from -mm isn't responsible? 
Also have you tried rsdl on 2.6.20 as Willy suggested? I would really love to 
get to the bottom of this as it really shouldn't behave that way under load 
no matter how the load is dished out.

Thanks!

-- 
-ck
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