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

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Date:	Fri, 9 Mar 2007 19:42:30 -0600
From:	Matt Mackall <mpm@...enic.com>
To:	Con Kolivas <kernel@...ivas.org>
Cc:	linux-kernel <linux-kernel@...r.kernel.org>,
	akpm@...ux-foundation.org
Subject: Re: 2.6.21-rc3-mm1 RSDL results

On Sat, Mar 10, 2007 at 12:28:38PM +1100, Con Kolivas wrote:
> On Saturday 10 March 2007 11:49, Matt Mackall wrote:
> > On Sat, Mar 10, 2007 at 11:34:26AM +1100, Con Kolivas wrote:
> > > Ok, so some of the basics then. Can you please give me the output of 'top
> > > -b' running for a few seconds during the whole affair?
> >
> > Here you go:
> >
> > http://selenic.com/baseline
> > http://selenic.com/underload
> >
> > This is with 2.6.20+rsdl+tickfix at HZ=250.
> >
> > Something I haven't mentioned about my setup is that I'm using ccache.
> > And it turns out disabling ccache makes a large difference. Going to
> > switch back to a NO_HZ kernel and see what that looks like.
> 
> Your X is reniced to -10 so.... try again with X nice 0 please.

Doh, can't believe I didn't notice that. That's apparently a default
in Debian/unstable (not sure where to tweak it). Reniced:

             without ccache    with ccache
make -j 5 
 beryl       good              ok
 galeon      ok/good           ok
 mp3         good              good
 terminal    good              ok
 mouse       good              ok

We're still left with a big unexplained ccache differential, and a big
NO_HZ vs HZ=250 differential.

-- 
Mathematics is the supreme nostalgia of our time.
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