From mboxrd@z Thu Jan 1 00:00:00 1970 From: Philipp Hahn Subject: Re: =?iso-8859-1?q?=5BBUG_2=2E6=2E32=2Ey=5D_Broken_PV_mig?= =?iso-8859-1?q?ration_between_hosts_with=09different_uptime=2C_non?= =?iso-8859-1?q?-monotonic_time=3F?= Date: Fri, 4 May 2012 15:10:53 +0200 Message-ID: <201205041510.56986.hahn@univention.de> References: <201205041054.04079.hahn@univention.de> <4FA3B1C7.4060201@citrix.com> Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="===============8699982309584793595==" Return-path: In-Reply-To: <4FA3B1C7.4060201@citrix.com> List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Sender: xen-devel-bounces@lists.xen.org Errors-To: xen-devel-bounces@lists.xen.org To: xen-devel@lists.xen.org Cc: Thomas Gleixner , David Vrabel List-Id: xen-devel@lists.xenproject.org --===============8699982309584793595== Content-Type: multipart/signed; boundary="nextPart11425697.Xf5rhIgNHA"; protocol="application/pgp-signature"; micalg=pgp-sha1 Content-Transfer-Encoding: 7bit --nextPart11425697.Xf5rhIgNHA Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Content-Disposition: inline Hello David, On Friday 04 May 2012 12:39:03 David Vrabel wrote: > On 04/05/12 09:54, Philipp Hahn wrote: > > I encountered the following bug when migrating a Linux-2.6.32.54 PV > > domain on Xen-3.4.3 between different hosts, whose uptime differs by > > several minutes =2E..=20 > Xen 3.4 doesn't ensure that the TSC is stable across migrates (Xen 4.0 > does). If the host CPU has the CONSTANT_TSC bit in the Advanced Power > Management CPUID leaf it will pass this through to the guest which makes > the guest think the TSC is stable. > > Can you try this libxc patch? > > 8<------------------------ > libxc: clear CONSTANT_TSC bit in Advanced Power Management CPUID leaf Excellent, that fixes the problem for me and makes perfect sense for me, si= nce=20 AFAIK 2.6.37 also received a big TSC patch which is not part of 2.6.32.y=20 backport. Thank your for your help. Sincerely Philipp Hahn =2D-=20 Philipp Hahn Open Source Software Engineer hahn@univention.de Univention GmbH be open. fon: +49 421 22 232- 0 Mary-Somerville-Str.1 D-28359 Bremen fax: +49 421 22 232-99 http://www.univention.de/ --nextPart11425697.Xf5rhIgNHA Content-Type: application/pgp-signature; name=signature.asc Content-Description: This is a digitally signed message part. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.9 (GNU/Linux) iEYEABECAAYFAk+j1V0ACgkQYPlgoZpUDjmMJQCfbe8pg8Jae07dV1linaE8Mvbw 7msAoMDZagErQfRoESEI4uO5ToqIsovU =4Kof -----END PGP SIGNATURE----- --nextPart11425697.Xf5rhIgNHA-- --===============8699982309584793595== Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Content-Disposition: inline _______________________________________________ Xen-devel mailing list Xen-devel@lists.xen.org http://lists.xen.org/xen-devel --===============8699982309584793595==--