From mboxrd@z Thu Jan 1 00:00:00 1970 From: Tomasz Chmielewski Subject: Re: strange guest slowness after some time Date: Sun, 15 Mar 2009 14:19:56 +0100 Message-ID: <49BD007C.9030809@wpkg.org> References: <49B29705.6000904@wpkg.org> <49B4E7A6.3090601@redhat.com> <49B4EDC9.9020504@wpkg.org> <49B4EE8F.7050001@redhat.com> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Cc: "kvm@vger.kernel.org" To: Avi Kivity Return-path: Received: from mx03.syneticon.net ([78.111.66.105]:32794 "EHLO mx03.syneticon.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753027AbZCONUA (ORCPT ); Sun, 15 Mar 2009 09:20:00 -0400 In-Reply-To: <49B4EE8F.7050001@redhat.com> Sender: kvm-owner@vger.kernel.org List-ID: Avi Kivity schrieb: >>> I'm guessing there's a problem with timers or timer interrupts. >>> >>> What is the host cpu? >> >> 4 entries like this in /proc/cpuinfo: >> >> processor : 3 >> vendor_id : AuthenticAMD >> cpu family : 15 >> model : 65 >> model name : Dual-Core AMD Opteron(tm) Processor 2212 >> > > That's probably the kvmclock issue that hit older AMDs. It was fixed in > kvm-84, please try that. I've been running it for about a week now with kvm-84 and no guest got slow. Can it be related to using cpufreq and ondemand governor? 1) with kvm-83 and cpufreq/ondemand, guests go totally crazy (see "Houston, we have May 15, 1953" thread) 2) with kvm-83 without cpufreq, "slowness" affects guests sometimes 3) with kvm-84 and cpufreq/ondemand, "slowness" affects guests sometimes 4) with kvm-84 without cpufreq, everything run correctly (at least it does for a week now) Does anything from this make any sense? I would really like to use cpufreq/ondemand on the host with KVM, as my tests show it would save me about 50 EUR on electricity bills per one of such servers yearly. -- Tomasz Chmielewski http://wpkg.org