From mboxrd@z Thu Jan  1 00:00:00 1970
Received: from mailman by lists.gnu.org with tmda-scanned (Exim 4.43)
	id 1KcMXw-0008RO-E1
	for qemu-devel@nongnu.org; Sun, 07 Sep 2008 11:51:28 -0400
Received: from exim by lists.gnu.org with spam-scanned (Exim 4.43)
	id 1KcMXv-0008QD-3l
	for qemu-devel@nongnu.org; Sun, 07 Sep 2008 11:51:28 -0400
Received: from [199.232.76.173] (port=34559 helo=monty-python.gnu.org)
	by lists.gnu.org with esmtp (Exim 4.43) id 1KcMXu-0008QA-Q0
	for qemu-devel@nongnu.org; Sun, 07 Sep 2008 11:51:26 -0400
Received: from toccata.ens-lyon.org ([140.77.166.68]:54815)
	by monty-python.gnu.org with esmtps
	(TLS-1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.60)
	(envelope-from <samuel.thibault@labri.fr>) id 1KcMXu-00056Z-HB
	for qemu-devel@nongnu.org; Sun, 07 Sep 2008 11:51:26 -0400
Received: from localhost (localhost [127.0.0.1])
	by toccata.ens-lyon.org (Postfix) with ESMTP id E813284088
	for <qemu-devel@nongnu.org>; Sun,  7 Sep 2008 17:51:24 +0200 (CEST)
Received: from toccata.ens-lyon.org ([127.0.0.1])
	by localhost (toccata.ens-lyon.org [127.0.0.1]) (amavisd-new,
	port 10024) with ESMTP id HP0XZgeZBzBV for <qemu-devel@nongnu.org>;
	Sun,  7 Sep 2008 17:51:24 +0200 (CEST)
Received: from implementation.famille.thibault.fr
	(243.168.103-84.rev.gaoland.net [84.103.168.243])
	(using TLSv1 with cipher AES256-SHA (256/256 bits))
	(No client certificate requested)
	by toccata.ens-lyon.org (Postfix) with ESMTP id 90E3A84086
	for <qemu-devel@nongnu.org>; Sun,  7 Sep 2008 17:48:44 +0200 (CEST)
Date: Sun, 7 Sep 2008 17:41:43 +0200
From: Samuel Thibault <samuel.thibault@ens-lyon.org>
Subject: Re: [Qemu-devel] [PATCH] opengl rendering in the sdl window
Message-ID: <20080907154143.GQ4307@implementation>
References: <48B81423.9050502@eu.citrix.com>
	<200809071603.31181.paul@codesourcery.com>
	<20080907151254.GP4307@implementation>
	<200809071635.54858.paul@codesourcery.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=iso-8859-1
Content-Disposition: inline
In-Reply-To: <200809071635.54858.paul@codesourcery.com>
Content-Transfer-Encoding: quoted-printable
Reply-To: qemu-devel@nongnu.org
List-Id: qemu-devel.nongnu.org
List-Unsubscribe: <http://lists.nongnu.org/mailman/listinfo/qemu-devel>,
	<mailto:qemu-devel-request@nongnu.org?subject=unsubscribe>
List-Archive: <http://lists.gnu.org/pipermail/qemu-devel>
List-Post: <mailto:qemu-devel@nongnu.org>
List-Help: <mailto:qemu-devel-request@nongnu.org?subject=help>
List-Subscribe: <http://lists.nongnu.org/mailman/listinfo/qemu-devel>,
	<mailto:qemu-devel-request@nongnu.org?subject=subscribe>
To: Paul Brook <paul@codesourcery.com>
Cc: qemu-devel@nongnu.org

Paul Brook, le Sun 07 Sep 2008 16:35:54 +0100, a =E9crit :
> It also depends what testcase you're benchmarking. A few pixels changin=
g every=20
> frame is IMHO not a particularly interesting case.

But we shouldn't spend time on it.  For qemu it's trivial to get the
dirtyness of course. For Xen/KVM it's far less.

> The interesting cases are guest completely idle,

Which needs to be somehow detected.

> and large screen updates.

In that case, why blitting from main memory to video memory?  Sure video
memory is slow.  But the guest already does tricky stuff to cope with
that...

Samuel