From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jan Bernauer Subject: Re: BUG: Guest lockup and 100% CPU load on host Date: Fri, 16 Jan 2009 11:13:11 +0100 Message-ID: <49705DB7.8020900@kph.uni-mainz.de> References: Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: QUOTED-PRINTABLE To: kvm@vger.kernel.org Return-path: Received: from mail.kph.uni-mainz.de ([134.93.132.3]:2170 "EHLO mail.kph.uni-mainz.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1765020AbZAPKWJ (ORCPT ); Fri, 16 Jan 2009 05:22:09 -0500 Received: from [134.93.134.82] (a1iproton.kph.uni-mainz.de [134.93.134.82]) by mail.kph.uni-mainz.de (8.12.9p2/8.12.9) with ESMTP id n0GADBn0003893 for ; Fri, 16 Jan 2009 11:13:12 +0100 (CET) (envelope-from bernauer@kph.uni-mainz.de) In-Reply-To: Sender: kvm-owner@vger.kernel.org List-ID: Hi, thanks for the info! It seems quite stable now, but I haven't tried -smp 2 yet. Timing problems seem plausible: I have a dvb-card passed through to th= e guest. With normal setup, the frontend detection of the driver module breaks every other try with a i2c timeout. I changed the cpufreq governor of the host from ondemand to performance= , and the guest seemed stable, until suddenly the timeouts filled the log= s again. Until now, with clocksource=3Dacpi_pm, I saw only occasional irq timeou= ts of the card (like, under 10 in 30 minutes), under heavy load of the gue= st. James Thomason wrote: > I spent some time with the same problem over the last two days. Avi = Kivity > suggested adding "clocksource=3Dacpi_pm" to the guest kernel boot lin= e, and > that seems to have resolved the issue. Would you give that a try and = let me > know the result? Also I believe the following bugs might be related: >=20 > [ 2351676 ] Guests hang periodically on Ubuntu-8.10 > [ 2353811 ] Solaris 10 guest unstable > [ 2494730 ] Guests "stalling" on kvm-82 > [ 2138079 ] kvm locks up system > [ 2113643 ] guests AND host still getting stuck under CPU load >=20 Best regards, Jan --=20 Jan C. Bernauer email: bernauer@kph.uni-mainz.de Institut f=FCr Kernphysik tel : 06131 - 39 25826 Johannes-Gutenberg-Universit=E4t Mainz fax : 06131 - 39 22964 Johann-Joachim-Becher-Weg 45 55099 Mainz