From mboxrd@z Thu Jan  1 00:00:00 1970
Received: from mailman by lists.gnu.org with tmda-scanned (Exim 4.43)
	id 1Mia73-0005kw-Uv
	for qemu-devel@nongnu.org; Tue, 01 Sep 2009 16:37:58 -0400
Received: from exim by lists.gnu.org with spam-scanned (Exim 4.43)
	id 1Mia6z-0005kW-7F
	for qemu-devel@nongnu.org; Tue, 01 Sep 2009 16:37:57 -0400
Received: from [199.232.76.173] (port=36188 helo=monty-python.gnu.org)
	by lists.gnu.org with esmtp (Exim 4.43) id 1Mia6z-0005kT-3z
	for qemu-devel@nongnu.org; Tue, 01 Sep 2009 16:37:53 -0400
Received: from lo.gmane.org ([80.91.229.12]:47411)
	by monty-python.gnu.org with esmtps (TLS-1.0:RSA_AES_256_CBC_SHA1:32)
	(Exim 4.60) (envelope-from <gceq-qemu-devel@m.gmane.org>)
	id 1Mia6y-0003Vb-La
	for qemu-devel@nongnu.org; Tue, 01 Sep 2009 16:37:52 -0400
Received: from list by lo.gmane.org with local (Exim 4.50) id 1Mia6w-0001eI-9e
	for qemu-devel@nongnu.org; Tue, 01 Sep 2009 22:37:50 +0200
Received: from 143.166.197.6 ([143.166.197.6])
	by main.gmane.org with esmtp (Gmexim 0.1 (Debian))
	id 1AlnuQ-0007hv-00
	for <qemu-devel@nongnu.org>; Tue, 01 Sep 2009 22:37:50 +0200
Received: from charles by 143.166.197.6 with local (Gmexim 0.1 (Debian))
	id 1AlnuQ-0007hv-00
	for <qemu-devel@nongnu.org>; Tue, 01 Sep 2009 22:37:50 +0200
From: Charles Duffy <charles@dyfis.net>
Date: Tue, 01 Sep 2009 15:37:10 -0500
Message-ID: <h7k0m8$s30$1@ger.gmane.org>
References: <E341C6E8-D4BC-4964-A527-AE1CD22F4D54@irisa.fr>	<4A969496.2070305@codemonkey.ws>	<076B9FA6-C362-47C1-AA8B-70BF147843A6@irisa.fr>	<4A96B353.8070600@codemonkey.ws>	<65558604-590A-4FD7-877D-E676CE195C7A@irisa.fr>	<4A97FA9B.1030401@codemonkey.ws>
	<h7hke3$3o8$1@ger.gmane.org>
	<1035D85E-79C1-4F45-B4E7-90E74260D43C@irisa.fr>
Mime-Version: 1.0
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Content-Transfer-Encoding: 7bit
In-Reply-To: <1035D85E-79C1-4F45-B4E7-90E74260D43C@irisa.fr>
Sender: news <news@ger.gmane.org>
Subject: [Qemu-devel] Re: [BUG] Regression of exec migration
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: qemu-devel@nongnu.org

Pierre Riteau wrote:
> I'm afraid this solves the problem only because you disabled non 
> blocking operations on the file descriptor, effectively reverting 
> 907500095851230a480b14bc852c4e49d32cb16d.
> See comment inline.

Indeed -- fixing this oversight, I'm seeing 2m30s to write an 84mb ramsave.

This doesn't seem to square with Anthony's suggestion that the f* 
functions are to blame; we're still doing an fdopen() call and using f* 
on incoming migrations, but it's not incoming migrations where we're 
having performance issues.