Date: Wed, 28 Nov 2007 19:37:06 +0100
From: Ingo Molnar <mingo@elte.hu>
To: Jeff Dike <jdike@addtoit.com>
Cc: Miklos Szeredi <miklos@szeredi.hu>,
       user-mode-linux-devel@lists.sourceforge.net,
       linux-kernel@vger.kernel.org
Subject: Re: -rt doesn't compile for UML
Message-ID: <20071128183706.GA3826@elte.hu>
References: <E1IxMK0-0006ae-2s@dorka.pomaz.szeredi.hu> <20071128150637.GA5518@c2.user-mode-linux.org> <E1IxOwS-000752-HF@dorka.pomaz.szeredi.hu> <20071128182935.GA8048@c2.user-mode-linux.org>
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* Jeff Dike <jdike@addtoit.com> wrote:

> On Wed, Nov 28, 2007 at 04:35:12PM +0100, Miklos Szeredi wrote:
> > Something like:
> > 
> >   dd if=/host/tmp/bigfile of=/tmp/bigfile bs=1048576 count=100
> > 
> > and run 'top' or 'watch something' in another terminal, which
> > sometimes completely stops updating during the write.
> 
> Are you talking about missing updates for a few seconds, or for 
> longer?  With the common above, with top -delay 1, and with 600M of 
> data, I'm seeing occasional 2-3 pauses, with one missing 5 seconds.

even sub-second delays are a huge issue if the system is otherwise idle 
- it signals some sort of missed event condition. scheduling must be 
instantenous.

	Ingo
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