From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from h19-45-4-185.rev.hosting.nbs-system.com ([185.4.45.19]:19901 "EHLO owa.groupeot.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S934668AbdGTP5l (ORCPT ); Thu, 20 Jul 2017 11:57:41 -0400 Subject: Re: [Xen-users] File-based domU - Slow storage write since xen 4.8 To: Keith Busch References: <5554bd39-6e0a-5c17-2b64-bb80d4a6502b@nbs-system.com> <5b562ef2-36e2-a08e-1683-6ffc7cfa54de@nbs-system.com> <20170717124931.rsiqxkzzkmvfofd7@MacBook-Pro-de-Roger.local> <5dd18982-cbcf-a675-1e07-5b4c4e4da50e@nbs-system.com> <20170717164658.drliebetcnil3wjb@dhcp-3-128.uk.xensource.com> <20170720085256.e3m35aalg6jn7qrh@dhcp-3-128.uk.xensource.com> <7205d904-44a3-631f-fbd8-8b62d43ca4e0@nbs-system.com> <20170720153346.GC1202@localhost.localdomain> CC: =?UTF-8?Q?Roger_Pau_Monn=c3=a9?= , , WebDawg , From: Benoit Depail Message-ID: <0c158c47-fa56-68a6-1517-12700afee2c3@nbs-system.com> Date: Thu, 20 Jul 2017 17:57:27 +0200 MIME-Version: 1.0 In-Reply-To: <20170720153346.GC1202@localhost.localdomain> Content-Type: multipart/signed; micalg=pgp-sha512; protocol="application/pgp-signature"; boundary="U8BF5ASnTK2sfaWIrQncI2adnT321PP3v" Sender: linux-block-owner@vger.kernel.org List-Id: linux-block@vger.kernel.org --U8BF5ASnTK2sfaWIrQncI2adnT321PP3v Content-Type: multipart/mixed; boundary="megDROqMSuNqUKNkrwQdKn7rLgSuCURbj"; protected-headers="v1" From: Benoit Depail To: Keith Busch Cc: =?UTF-8?Q?Roger_Pau_Monn=c3=a9?= , xen-users@lists.xen.org, WebDawg , linux-block@vger.kernel.org Message-ID: <0c158c47-fa56-68a6-1517-12700afee2c3@nbs-system.com> Subject: Re: [Xen-users] File-based domU - Slow storage write since xen 4.8 References: <5554bd39-6e0a-5c17-2b64-bb80d4a6502b@nbs-system.com> <5b562ef2-36e2-a08e-1683-6ffc7cfa54de@nbs-system.com> <20170717124931.rsiqxkzzkmvfofd7@MacBook-Pro-de-Roger.local> <5dd18982-cbcf-a675-1e07-5b4c4e4da50e@nbs-system.com> <20170717164658.drliebetcnil3wjb@dhcp-3-128.uk.xensource.com> <20170720085256.e3m35aalg6jn7qrh@dhcp-3-128.uk.xensource.com> <7205d904-44a3-631f-fbd8-8b62d43ca4e0@nbs-system.com> <20170720153346.GC1202@localhost.localdomain> In-Reply-To: <20170720153346.GC1202@localhost.localdomain> --megDROqMSuNqUKNkrwQdKn7rLgSuCURbj Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: quoted-printable On 07/20/17 17:33, Keith Busch wrote: > On Thu, Jul 20, 2017 at 05:12:33PM +0200, Benoit Depail wrote: >> >> The main issue we are seeing is degraded write performance on storage >> devices of Xen PV DomUs, about half (or even a third on our production= >> setup where NFS is involved) of what we used to have. >=20 > Read performance is unchanged? >=20 Read performance is unaffected indeed. --=20 Benoit Depail Senior Infrastructures Architect NBS System --megDROqMSuNqUKNkrwQdKn7rLgSuCURbj-- --U8BF5ASnTK2sfaWIrQncI2adnT321PP3v Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- iQKxBAEBCgCbFiEEUVI4Zy9ojyLG8rQSok/WASnIOwQFAllw0udfFIAAAAAALgAo aXNzdWVyLWZwckBub3RhdGlvbnMub3BlbnBncC5maWZ0aGhvcnNlbWFuLm5ldDUx NTIzODY3MkY2ODhGMjJDNkYyQjQxMkEyNEZENjAxMjlDODNCMDQdHGJlbm9pdC5k ZXBhaWxAbmJzLXN5c3RlbS5jb20ACgkQok/WASnIOwR5PRAAhkKRMhxz321ZZ6q9 8Iu9/nIsMcy5SqgquCerN8U+ir5TwCbXQxVZih5Z2Xn553wcnKyiqaoJw6iqjv/m gUJJTah8Zshe6Ptas/Xfcx31vtIqNQYs6RjYv3HdfAYxFQxAFxjGg9B5oMi6Fjbi 2fYTefZPIqCpnZ3n2PdxkPKq5dTTx62qiGZ9hA6+RhBHRKzMh5KeRTVqmHooJmXh wIo9hL8S+wnt1RXbEbAxo8quxybDkHRjZtPgqEexC1j5bjWzJOTIfYq2EkCjXbb9 uYTNUXuiAdMash74tVGSn8FyMsFjaTMiMOVHEOsHBjfbvN5WED7FfE0OOYvSeTyt pl4wrAfZJiKIjYut7286arIhpxwyNdh3Ulx6TkKxsoWkK1wc7bujfcUJl/K/m57j RJUhDYGT0YlkFWyNg7booOaTvHgPcfIanCuDELxMeElVYBClTTY3yXYBoK2eqaBp eNi4fb3a2K8GgFt3GgmNTu9q4e9Piro5RhUMlwff2+wleyHc3ihuH1J1eXaMddKV JKLsWNjerCIyQG9nIh4J1Vz3kz/rZz65QaCHiHeiQ04EURelEkHLf1QiKyD6Jzd3 toqtKegLGaJumn6wgNerrawltqoLrFF81EyZ7LtQNRNFWwrwKdymE8d0LjkksllR +wO9IlR4ik0XxJcy8LLM4E2LRpw= =2fhz -----END PGP SIGNATURE----- --U8BF5ASnTK2sfaWIrQncI2adnT321PP3v--