Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755725AbXJ2WyZ (ORCPT ); Mon, 29 Oct 2007 18:54:25 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753053AbXJ2WyP (ORCPT ); Mon, 29 Oct 2007 18:54:15 -0400 Received: from smtp-outbound-1.vmware.com ([65.113.40.141]:55221 "EHLO smtp-outbound-1.vmware.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753301AbXJ2WyN (ORCPT ); Mon, 29 Oct 2007 18:54:13 -0400 Subject: Re: [PATCH] raise tsc clocksource rating From: Zachary Amsden To: Ingo Molnar Cc: Glauber de Oliveira Costa , linux-kernel@vger.kernel.org, tglx@linutronix.de, rusty@rustcorp.com.au, jeremy@goop.org, --cc@redhat.com, avi@quramnet.com, kvm-devel@lists.sourceforge.net, Glauber de Oliveira Costa , Dan Hecht , Garrett Smith In-Reply-To: <20071029224852.GA27547@elte.hu> References: <11936994092607-git-send-email-gcosta@redhat.com> <1193697734.9793.86.camel@bodhitayantram.eng.vmware.com> <20071029224852.GA27547@elte.hu> Content-Type: text/plain Date: Mon, 29 Oct 2007 15:55:05 -0700 Message-Id: <1193698505.9793.90.camel@bodhitayantram.eng.vmware.com> Mime-Version: 1.0 X-Mailer: Evolution 2.10.2 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 659 Lines: 17 On Mon, 2007-10-29 at 23:48 +0100, Ingo Molnar wrote: > * Zachary Amsden wrote: > if it's inaccurate why are you exposing it to the guest then? Native > only uses the TSC if it's safe and accurate to do so. Not every guest support paravirt, but for correctness, all guests require TSC, which must be exposed all the way up to userspace, no matter what the efficiency or accuracy may be. Zach - 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/