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

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Date:	Fri, 9 Mar 2007 12:27:45 -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 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.

My baseline test was with mainline NO_HZ=y.

As an aside, we should not name config options NO_* or DISABLE_*
because of the potential for double negation.

-- 
Mathematics is the supreme nostalgia of our time.
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