From mboxrd@z Thu Jan 1 00:00:00 1970 From: Stefan Bader Subject: Re: Xen PVM: Strange lockups when running PostgreSQL load Date: Fri, 19 Oct 2012 17:21:04 +0200 Message-ID: <50816FE0.8040005@canonical.com> References: <1350479456-4007-1-git-send-email-stefan.bader@canonical.com> <507EB27D.8050308@citrix.com> <1350482118.2460.74.camel@zakaz.uk.xensource.com> <507ECD06.2050407@canonical.com> <507ED038.8000806@citrix.com> <507FC51102000078000A235E@nat28.tlf.novell.com> <507FC71502000078000A236C@nat28.tlf.novell.com> <507FB1E1.8080700@canonical.com> <1350546483.28188.25.camel@dagon.hellion.org.uk> <507FD7DE.2010209@canonical.com> <507FFA5102000078000A250D@nat28.tlf.novell.com> <507FF964.9090009@canonical.com> <50806C0B.1060504@canonical.com> <5081264002000078000A2841@nat28.tlf.novell.com> <50811047.4080200@canonical.com> <5081387B02000078000A288D@nat28.tlf.novell.com> <50815DA1.10303@canonical.com> <5081847E02000078000A2A09@nat28.tlf.novell.com> <50816A6E.5010602@canonical.com> <5081891502000078000A2A5E@nat28.tlf.novell.com> Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="===============8997834106549331608==" Return-path: In-Reply-To: <5081891502000078000A2A5E@nat28.tlf.novell.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: Jan Beulich Cc: Andrew Cooper , Konrad Rzeszutek Wilk , Ian Campbell , "xen-devel@lists.xen.org" List-Id: xen-devel@lists.xenproject.org This is an OpenPGP/MIME signed message (RFC 2440 and 3156) --===============8997834106549331608== Content-Type: multipart/signed; micalg=pgp-sha512; protocol="application/pgp-signature"; boundary="------------enig2B081FC376051B1C34B5D444" This is an OpenPGP/MIME signed message (RFC 2440 and 3156) --------------enig2B081FC376051B1C34B5D444 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable On 19.10.2012 17:08, Jan Beulich wrote: >>>> On 19.10.12 at 16:57, Stefan Bader wrot= e: >> On 19.10.2012 16:49, Jan Beulich wrote: >> >>>> No, I assumed that you saying native kernel did prior to ticket lock= =20 >>>> conversion, >>> >>> I indeed did say that. Just go look back at the old code. >> >> No, sorry, but no. Just that old code did it does not help me here. I = di=20 >> believe >> you there. Still it seems there is something wrong doing it there in a= pv=20 >> guest. >=20 > PV guest may be a little broad - did you observe such a problem > with a recent kernel of ours? 3.2 (ok, older) and 3.5 up to now, certainly can and should retry with at= least 3.6. And on the host side it was on Amazon EC2 and locally with a 4.1.2 h= ost. >=20 >> Though I cannot give a satisfying explanation, yet. >=20 > But that's going to be necessary in order to judge whether the > brute force approach you take is really the only alternative (and > whether it's fixing the problem rather than just making it less > likely). I know. Unfortunately that means digging quite deeply in the not-so-well-= known. And it does not help either that the backtraces in the dump seem not comp= letely trustworthy. Like vcpus that the host says are polling on a certain event= channel do not seem to be sitting on the hypercall. >=20 > Jan >=20 --------------enig2B081FC376051B1C34B5D444 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://www.enigmail.net/ iQIcBAEBCgAGBQJQgW/gAAoJEOhnXe7L7s6jrtcP+weopkZ7G+evMPbIzjfeAETk N7ANMgK+x9Cx1SkRo5ZvchKiHQgj6vWUlqQ5d0zCt80oRKcNInOrpiFvytnLI1bE 6X9CVAI+ppHH5B1H76z3lg3joKU5Il6hwhDtCeRd+KQ9Rd/etQty8/5MbHQ3oTG8 vY3E8ZpzKRjNyLO5l9dRenPLa9W8KrtcmUv+IUNsziVz91fooHZEsn+HdvQYIc67 AbddXjv9ODL8a4i4Mpe+WkpdEnYyjoFsryjrgrxpKHYQ8/Sp3kDwF6aknNRChAUF BcwGaSnUrC1Rl1TKeYc8L0lQa2/pWtTjc4Vezek3Fk8P0BIiWFs+Akop8IZVH1m3 Qe0gP68vbyLHDECzXMm1CzFfNWIpqtKR7YMLKEwHhD4jM2xflULrD2PYRbsgs8MF eDTqQQG5t2V6nRS0Dv4aHE9dxYzjWwqKPiiAOv6hTgkoo7m0rm5KmVFpb3+TGDSS x+YMhdMIRN/hCzd7Q47fqf2HMPetnsOs8MdKt+52ljJ0AR0BZ+CwR3cMfJlImPeL jArTz4rsGhyH75t9JZ/xV4nP+TQsAIJSOKqjBBD/AccqS7mVvje/R51dHHL6XqKn Uq2KaRfU1tQXqJnvXxcRdyaajx2g5UbCkoJOKr6vzdAl1CLMyAYIT37koTzKbazZ QZZF2lQkuat1BJrc8BXQ =KzR2 -----END PGP SIGNATURE----- --------------enig2B081FC376051B1C34B5D444-- --===============8997834106549331608== 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 --===============8997834106549331608==--