From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([208.118.235.92]:52228) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1UBQrt-0005No-PG for qemu-devel@nongnu.org; Fri, 01 Mar 2013 09:23:26 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1UBQrs-0005We-9A for qemu-devel@nongnu.org; Fri, 01 Mar 2013 09:23:25 -0500 Received: from mx1.redhat.com ([209.132.183.28]:15631) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1UBQrs-0005WO-1E for qemu-devel@nongnu.org; Fri, 01 Mar 2013 09:23:24 -0500 Message-ID: <5130B9D7.2050108@redhat.com> Date: Fri, 01 Mar 2013 07:23:19 -0700 From: Eric Blake MIME-Version: 1.0 References: <5130ADC0.9070402@dlhnet.de> <5130B29C.3060301@redhat.com> <5130B5D8.7030308@dlhnet.de> <5130B677.1060604@redhat.com> <5130B789.7050709@dlhnet.de> In-Reply-To: <5130B789.7050709@dlhnet.de> Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="----enig2DGKOKNRWACJUGQEOHQEL" Subject: Re: [Qemu-devel] [PATCH] migration: use XBZRLE only after bulk stage List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Peter Lieven Cc: Orit Wasserman , "qemu-devel@nongnu.org" , Paolo Bonzini This is an OpenPGP/MIME signed message (RFC 4880 and 3156) ------enig2DGKOKNRWACJUGQEOHQEL Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable On 03/01/2013 07:13 AM, Peter Lieven wrote: > On 01.03.2013 15:08, Eric Blake wrote: >> On 03/01/2013 07:06 AM, Peter Lieven wrote: >>>> Do you have any benchmark numbers? At any rate, the explanation see= ms >>>> sound, so a benchmark should show this. >>> >>> Do you have a particular test pattern in mind? If there is nothing >>> going on >>> in the VM XBZRLE will not be better than normal copy at all. >>> >>> Otherwise you will have N xbzrle misses and 0 xbzrle pages without th= e >>> patch >>> and 0 xbzrle misses and 0 xbzrle pages with the patch. >> >> How about a migration of a guest running the synthetic r/w load >> generator in docs/xbzrle.txt? >> > Good idea. I will leave max downtime and bandwidth at default values. >=20 > Would you be happy with 1GB vRAM and 256MB page cache? Sure - just any run that you can do that shows before and after numbers, and that is described well enough to be a reproducible test. Final statistics on the migration (pages transferred, cache hits and misses, etc) and time spent on the migration will hopefully show an improvement, but most important is that they do not show a regression. --=20 Eric Blake eblake redhat com +1-919-301-3266 Libvirt virtualization library http://libvirt.org ------enig2DGKOKNRWACJUGQEOHQEL Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.13 (GNU/Linux) Comment: Public key at http://people.redhat.com/eblake/eblake.gpg Comment: Using GnuPG with Thunderbird - http://www.enigmail.net/ iQEcBAEBCAAGBQJRMLnXAAoJEKeha0olJ0Nqf38IAKafVEunYuwekZXkdCoOkash Ske1M/PdyNRhj7L10gaF/0jUOkmeyomRVv1HNcF4eBhDZ/t2lH2bHo7klUBJWMOh UQ0cPtLPTH7wYJ8JD+8gwxqaV+Vd2zLJ9MjnbGvH3uyDbiPVErYyUgTS0Bwy1SdI DwimP1umcO08X//3uU/JkLFOTWq0yJnv5v88SMN/uCIX64JWYBE0zB7f/rJlL4rm sXqq48PLH2G04VxMxEm0hJNspR6lC405jeSGJQMbk+OqwIj5PwojHKfy3L7Zpues l5p0TWFZrV7fckf8QdE8Hr+XfMQGRA02mXZ0A0QN3RgzWab8MOlQhXTZemc/bOI= =8P8V -----END PGP SIGNATURE----- ------enig2DGKOKNRWACJUGQEOHQEL--