From mboxrd@z Thu Jan 1 00:00:00 1970 From: Daniel Bareiro Subject: Re: kvm-88: KVM_APIC_READ: read reserved register b0 Date: Sat, 29 Aug 2009 18:20:36 -0300 Message-ID: <20090829212036.GA3014@defiant.freesoftware.org> References: <4A97AB92.9090509@l-mx.de> Reply-To: dbareiro@gmx.net Mime-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="Qxx1br4bt0+wmkIi" To: kvm@vger.kernel.org Return-path: Received: from mail.gmx.net ([213.165.64.20]:46765 "HELO mail.gmx.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with SMTP id S1752575AbZH2VUj (ORCPT ); Sat, 29 Aug 2009 17:20:39 -0400 Received: from defiant (defiant.freesoftware.org [10.1.0.65]) by hermes.freesoftware.org (Postfix) with ESMTP id 243B54B0 for ; Sat, 29 Aug 2009 18:20:05 -0300 (ART) Content-Disposition: inline In-Reply-To: <4A97AB92.9090509@l-mx.de> Sender: kvm-owner@vger.kernel.org List-ID: --Qxx1br4bt0+wmkIi Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Friday, 28 August 2009 12:04:02 +0200, Christoph Lechner wrote: > Hi all, Hi Christoph. =20 > running kvm-88 on a 2.6.26-1-amd64 kernel (stock Debian 5.0 kernel), I > get the syslog on the host system flooded with the message: >=20 > Aug 28 11:49:40 reactor kernel: [124035.611782] KVM_APIC_READ: read > reserved register b0 >=20 > The guest is running Debian 5.0 as well. Kernel 2.6.26-2-486. qemu is > started with the command line: > /opt/kvm-88/bin/qemu-system-x86_64 -hda web-int.img -m 512 -net > nic,vlan=3D0,macaddr=3D52:54:12:34:02:01 -net tap,vlan=3D0 -k de -vnc :4 >=20 >=20 > The message is always the same, only the timestamp differs. The log msg > is generated quite often, at least 10000 times per minute. The guest > system has 100% CPU usage, so has the qemu process on the host. I was > doing a search engine crawler run -- lots of network I/O -- , when the > log was filled. See the impressive growth rate of the syslog (crawler > running) >=20 > reactor:/virt# ls -l /var/log/syslog; sleep 60; ls -l /var/log/syslog > -rw-r----- 1 root adm 17765119 2009-08-28 11:47 /var/log/syslog > -rw-r----- 1 root adm 19124492 2009-08-28 11:48 /var/log/syslog > (at least 99.9% of the new log entries are of the same kind as the one > above ...) Also I am observing this behavior in one of my hosts with KVM-88 and Linux 2.6.30 compiled both by myself on Ubuntu GNU/Linux Hardy Heron server amd64, as I've mentioned in a previous [1] mail. Guests has Debian GNU/Linux Lenny with stock kernel 2.6.26. I was trying if with model=3Dvirtio the problem were solved, but was not successful. It would seem that the cause is due to something related to hardware of the host (is it possible?), since I have other hosts in which I use both the same version of KVM and kernel, also both compiled by myself, and I'm not having this problem. Regards, Daniel [1] http://thread.gmane.org/gmane.comp.emulators.kvm.devel/39324 --=20 Fingerprint: BFB3 08D6 B4D1 31B2 72B9 29CE 6696 BF1B 14E6 1D37 Powered by Debian GNU/Linux Squeeze - Linux user #188.598 --Qxx1br4bt0+wmkIi Content-Type: application/pgp-signature; name="signature.asc" Content-Description: Digital signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.9 (GNU/Linux) iEYEARECAAYFAkqZm6QACgkQZpa/GxTmHTc+JQCfYg95LZF9pObZAIafIzftRZji qPcAn1tlTYTt/5TzRlpkEn7FzcBwW3Oc =WUoY -----END PGP SIGNATURE----- --Qxx1br4bt0+wmkIi--