From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Brian J. Murrell" Subject: Re: 5x slower guest disk performance with virtio disk Date: Thu, 15 Dec 2011 14:43:23 -0500 Message-ID: <4EEA4DDB.5040203@interlinx.bc.ca> References: <20111215164434.IsVHDbflPT5f2Ac8ivIKgk@consulting.lsexperts.de> <4EEA2683.8080206@interlinx.bc.ca> <1323969382.3992.21.camel@lappy> <20111215172712.GC16183@redhat.com> Mime-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="------------enig66260C864B731B7216C7345F" Cc: Sasha Levin To: kvm@vger.kernel.org Return-path: Received: from lo.gmane.org ([80.91.229.12]:51898 "EHLO lo.gmane.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751400Ab1LOTnm (ORCPT ); Thu, 15 Dec 2011 14:43:42 -0500 Received: from list by lo.gmane.org with local (Exim 4.69) (envelope-from ) id 1RbHDQ-0002U1-Hh for kvm@vger.kernel.org; Thu, 15 Dec 2011 20:43:40 +0100 Received: from d67-193-214-242.home3.cgocable.net ([67.193.214.242]) by main.gmane.org with esmtp (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Thu, 15 Dec 2011 20:43:40 +0100 Received: from brian by d67-193-214-242.home3.cgocable.net with local (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Thu, 15 Dec 2011 20:43:40 +0100 In-Reply-To: <20111215172712.GC16183@redhat.com> Sender: kvm-owner@vger.kernel.org List-ID: This is an OpenPGP/MIME signed message (RFC 2440 and 3156) --------------enig66260C864B731B7216C7345F Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable On 11-12-15 12:27 PM, Daniel P. Berrange wrote: > On Thu, Dec 15, 2011 at 07:16:22PM +0200, Sasha Levin wrote: >> On Thu, 2011-12-15 at 11:55 -0500, Brian J. Murrell wrote: >>> So, about 2/3 of host speed now -- which is much better. Is 2/3 abou= t >>> normal or should I be looking for more?=20 >> >> aio=3Dnative >> >> Thats the qemu setting, I'm not sure where libvirt hides that. >=20 > > > ... > When I try to "virsh edit" and add that "" it seems to get stripped out of the config (as observed with "virsh dumpxml"). Doing some googling I discovered an alternate syntax (in message https://www.redhat.com/archives/libvirt-users/2011-June/msg00004.html): But the "io=3D'native'" seems to get stripped out of that too. FWIW, I have: qemu-kvm-0.12.1.2-2.113.el6.x86_64 libvirt-client-0.8.1-27.el6.x86_64 installed here on CentOS 6.0. Maybe this aio=3D is not supported in the above package(s)? Cheers, b. --------------enig66260C864B731B7216C7345F Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.11 (GNU/Linux) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/ iEUEARECAAYFAk7qTdsACgkQl3EQlGLyuXBnVgCXa2bXrC2UWy5zxZyGXLhvK728 aACgs2iuGwKkBAv1rCXayOMPyeYm+ww= =XSFf -----END PGP SIGNATURE----- --------------enig66260C864B731B7216C7345F--