From mboxrd@z Thu Jan 1 00:00:00 1970 From: Tomasz Chmielewski Subject: Re: Houston, we have May 15, 1953 (says guest when host uses cpufreq, and dies) Date: Wed, 18 Feb 2009 17:11:19 +0100 Message-ID: <499C3327.3090207@wpkg.org> References: <499C206A.5050109@wpkg.org> <499C3131.3030601@codemonkey.ws> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Cc: kvm@vger.kernel.org To: Anthony Liguori Return-path: Received: from mx03.syneticon.net ([78.111.66.105]:37605 "EHLO mx03.syneticon.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754834AbZBRQLR (ORCPT ); Wed, 18 Feb 2009 11:11:17 -0500 In-Reply-To: <499C3131.3030601@codemonkey.ws> Sender: kvm-owner@vger.kernel.org List-ID: Anthony Liguori schrieb: > Tomasz Chmielewski wrote: >> Is using cpufreq (i.e. with ondemand governor) on KVM host safe for >> guests? >> >> I enabled cpufreq on the host, it scaled down the host CPU (Dual-Core >> AMD Opteron(tm) Processor 2212) to 1 GHz from 2 GHz. > > Not with your processor. Intel processors should be fine and any AMD > processor that's Barcelona/Phenom or newer. Looks I'm a bad, bad, anti-environment CO2 contributor then. From a technical perspective, what are the problems with my CPU that it scales down on the host just fine, but makes the guests "return to the past"? -- Tomasz Chmielewski http://wpkg.org