linux-kernel - Re: Interesting interaction between lguest and CFS

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Message-ID: <20070604184224.GH11115@waste.org>
Date:	Mon, 4 Jun 2007 13:42:24 -0500
From:	Matt Mackall <mpm@...enic.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Rusty Russell <rusty@...tcorp.com.au>, akpm@...ux-foundation.org,
	Linux-kernel@...r.kernel.org
Subject: Re: Interesting interaction between lguest and CFS

On Mon, Jun 04, 2007 at 08:11:51PM +0200, Ingo Molnar wrote:
> 
> * Matt Mackall <mpm@...enic.com> wrote:
> 
> > With 2.6.22-rc3-mm1, I've got a long-running video transcoding going 
> > on. In other windows, I'm compiling, reading email, etc. with no 
> > noticeable problems.
> > 
> > If I fire up lguest and leave it sitting at a shell prompt for a 
> > couple moments, when I return to type something at the prompt, it can 
> > take 2-3 seconds for my input to echo. Once it starts responding, 
> > typing latency disappears. Suspend the other app and the latency 
> > disappears.
> 
> btw., does this only happen with lguest, or with other idle shells too?

Only noticed with lguest.
 
> perhaps lguest does something unusual when it idles? Does it fiddle 
> sched_clock() in any way?

In the host? That'd be weird.

-- 
Mathematics is the supreme nostalgia of our time.
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