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

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Message-Id: <200703100726.15517.kernel@kolivas.org>
Date:	Sat, 10 Mar 2007 07:26:15 +1100
From:	Con Kolivas <kernel@...ivas.org>
To:	Matt Mackall <mpm@...enic.com>
Cc:	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 07:15, Con Kolivas wrote:
> On Saturday 10 March 2007 05:27, Matt Mackall wrote:
> > On Fri, Mar 09, 2007 at 07:39:05PM +1100, Con Kolivas wrote:
> > > On Friday 09 March 2007 19:20, Matt Mackall wrote:
> > > > And I've just rebooted with NO_HZ and things are greatly improved. At
> > > > idle, Beryl effects are silky smooth (possibly better than stock) and
> > > > shows less load. Under 'make', Beryl is still responsive as is
> > > > Galeon. No sign of lagging mouse or typing.
> > > >
> > > > Under make -j 5, things are intermittent. Galeon scrolling is
> > > > sometimes still responsive, but Beryl, terminals and mouse still drag
> > > > quite a bit.
> > >
> > > I just replied before you sent this one out I think our messages passed
> > > each other across the ocean somewhere. I don't quite get what
> > > combination of factors you're saying here caused great improvement. Was
> > > it enabling NO_HZ on mainline cpu scheduler or disabling NO_HZ or on
> > > RSDL?
> >
> > Turning on NO_HZ on RSDL greatly improved it. I have not tried NO_HZ
> > on mainline. The first test was with NO_HZ=n, the second was with
> > NO_HZ=y.
>
> How odd. I would have thought that if an interaction was to occur it would
> have been without the new feature. Clearly what you describe without NO_HZ
> is not the expected behaviour with RSDL. I wonder what went wrong. Are you
> on 100HZ on that laptop? While I expect 100HZ should be ok, it might just
> not be... My laptop is about the same performance and works fine with 100HZ
> under load of all sorts BUT I don't have Beryl (which I would have thought
> swayed things in the opposite direction also).

Oh and can you grep dmesg for:
Scheduler bitmap error

If that occurs it's not performing properly. A subtle bug that's busting my 
chops to try and track down.

-- 
-ck
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