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

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Message-Id: <1181005320.25878.68.camel@localhost.localdomain>
Date:	Tue, 05 Jun 2007 11:02:00 +1000
From:	Rusty Russell <rusty@...tcorp.com.au>
To:	Olof Johansson <olof@...om.net>
Cc:	Matt Mackall <mpm@...enic.com>, Ingo Molnar <mingo@...e.hu>,
	akpm@...ux-foundation.org, Linux-kernel@...r.kernel.org,
	Stephen Rothwell <sfr@...b.auug.org.au>
Subject: Re: Interesting interaction between lguest and CFS

On Mon, 2007-06-04 at 17:58 -0500, Olof Johansson wrote:
> On Mon, Jun 04, 2007 at 12:37:10PM -0500, Matt Mackall 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.
> > 
> > The system isn't swapping and has basically no I/O load.
> 
> Is this on hvc console? The hvc driver was recently modified to back off
> it's timing interval when there's no input, the max value is 2 seconds.
> 
> See b791072ba3c3b29bab1890963bde52eb944a8451 for the changes in question.

Hmm, I thought that was only supposed to happen for "interruptless"
consoles?

Rusty.

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