Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756942Ab0GNQO4 (ORCPT ); Wed, 14 Jul 2010 12:14:56 -0400 Received: from mx1.redhat.com ([209.132.183.28]:63701 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753346Ab0GNQOy (ORCPT ); Wed, 14 Jul 2010 12:14:54 -0400 Message-ID: <4C3DE27B.6000005@redhat.com> Date: Wed, 14 Jul 2010 12:14:51 -0400 From: Rik van Riel User-Agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.1.9) Gecko/20100430 Fedora/3.0.4-2.fc12 Lightning/1.0b2pre Thunderbird/3.0.4 MIME-Version: 1.0 To: Zachary Amsden CC: KVM , Avi Kivity , Marcelo Tosatti , Glauber Costa , Linux-kernel Subject: Re: [PATCH 07/18] Fix deep C-state TSC desynchronization References: <1278987938-23873-1-git-send-email-zamsden@redhat.com> <1278987938-23873-8-git-send-email-zamsden@redhat.com> In-Reply-To: <1278987938-23873-8-git-send-email-zamsden@redhat.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 696 Lines: 18 On 07/12/2010 10:25 PM, Zachary Amsden wrote: > When CPUs with unstable TSCs enter deep C-state, TSC may stop > running. This causes us to require resynchronization. Since > we can't tell when this may potentially happen, we assume the > worst by forcing re-compensation for it at every point the VCPU > task is descheduled. > > Signed-off-by: Zachary Amsden Reviewed-by: Rik van Riel -- All rights reversed -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/