Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755062Ab0DTUAG (ORCPT ); Tue, 20 Apr 2010 16:00:06 -0400 Received: from mail.copilotco.com ([216.105.40.123]:44236 "EHLO mail.copilotco.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753571Ab0DTUAE (ORCPT ); Tue, 20 Apr 2010 16:00:04 -0400 Date: Tue, 20 Apr 2010 13:00:04 -0700 From: Tracy Reed To: Pasi =?iso-8859-1?Q?K=E4rkk=E4inen?= Cc: xen-devel@lists.xensource.com, Aoetools-discuss@lists.sourceforge.net, linux-kernel@vger.kernel.org Subject: Re: [Xen-devel] domU is causing misaligned disk writes Message-ID: <20100420200004.GQ5660@tracyreed.org> Mail-Followup-To: Tracy Reed , Pasi =?iso-8859-1?Q?K=E4rkk=E4inen?= , xen-devel@lists.xensource.com, Aoetools-discuss@lists.sourceforge.net, linux-kernel@vger.kernel.org References: <20100420080958.GN5660@tracyreed.org> <20100420084955.GV1878@reaktio.net> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="YNEMMPJXay2VNSoy" Content-Disposition: inline In-Reply-To: <20100420084955.GV1878@reaktio.net> User-Agent: Mutt/1.5.20 (2009-06-14) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2382 Lines: 71 --YNEMMPJXay2VNSoy Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Tue, Apr 20, 2010 at 11:49:55AM +0300, Pasi K=E4rkk=E4inen spake thusly: > Are you using filesystems on normal partitions, or LVM in the domU?=20 > I'm pretty sure this is a domU partitioning problem. Also: What changes in the view of the partitioning between domU and dom0? Wouldn't a partitioning error manifest itself in tests in the dom0 as well as in the domU? BTW: The dd from the last time in my last email finally finished: # dd if=3D/dev/zero of=3D/dev/xvdg1 bs=3D4096 count=3D3000000 3000000+0 records in 3000000+0 records out 12288000000 bytes (12 GB) copied, 734.714 seconds, 16.7 MB/s If I run that very same dd as above (the last test in my previous email) with the same partition setup again but this time from the dom0: # dd if=3D/dev/zero of=3D/dev/etherd/e6.1 bs=3D4096 count=3D3000000 3000000+0 records in 3000000+0 records out 12288000000 bytes (12 GB) copied, 107.352 seconds, 114 MB/s # /sbin/sfdisk -d /dev/etherd/e6.1=20 # partition table of /dev/etherd/e6.1 unit: sectors /dev/etherd/e6.1p1 : start=3D 64, size=3D566226926, Id=3D83 /dev/etherd/e6.1p2 : start=3D 0, size=3D 0, Id=3D 0 /dev/etherd/e6.1p3 : start=3D 0, size=3D 0, Id=3D 0 /dev/etherd/e6.1p4 : start=3D 0, size=3D 0, Id=3D 0 Device: rrqm/s wrqm/s r/s w/s rkB/s wkB/s avgrq-sz avgqu-sz await svctm %util sda 0.00 17350.80 0.60 275.60 22.40 72540.00 525.43 97.94 344.01 3.62 100.02 sdb 0.00 17374.80 1.20 256.00 28.00 74848.00 582.24 136.20 527.72 3.89 100.02 72MB/s and 74MB/s per disk in the stripe. Nice. Wish I could get that in a = domU! --=20 Tracy Reed http://tracyreed.org --YNEMMPJXay2VNSoy Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.5 (GNU/Linux) iD8DBQFLzgfE9PIYKZYVAq0RAsrgAJwKQgG2DIjKwVjl02w6RtMCwBYRQwCeIUO7 jE25k86r32OE10/2O4IVGLE= =xMKX -----END PGP SIGNATURE----- --YNEMMPJXay2VNSoy-- -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/