Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755477AbXJ2XWT (ORCPT ); Mon, 29 Oct 2007 19:22:19 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752410AbXJ2XWJ (ORCPT ); Mon, 29 Oct 2007 19:22:09 -0400 Received: from mx2.mail.elte.hu ([157.181.151.9]:44026 "EHLO mx2.mail.elte.hu" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751749AbXJ2XWH (ORCPT ); Mon, 29 Oct 2007 19:22:07 -0400 Date: Tue, 30 Oct 2007 00:21:40 +0100 From: Ingo Molnar To: Jeremy Fitzhardinge Cc: Zachary Amsden , Glauber de Oliveira Costa , linux-kernel@vger.kernel.org, tglx@linutronix.de, rusty@rustcorp.com.au, Avi Kivity , kvm-devel@lists.sourceforge.net, Glauber de Oliveira Costa , Dan Hecht , Garrett Smith Subject: Re: [PATCH] raise tsc clocksource rating Message-ID: <20071029232140.GA10518@elte.hu> References: <11936994092607-git-send-email-gcosta@redhat.com> <1193697734.9793.86.camel@bodhitayantram.eng.vmware.com> <20071029224852.GA27547@elte.hu> <47266431.1010500@goop.org> <20071029225528.GA31293@elte.hu> <47266A00.4040408@goop.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <47266A00.4040408@goop.org> User-Agent: Mutt/1.5.16 (2007-06-09) X-ELTE-VirusStatus: clean X-ELTE-SpamScore: -1.5 X-ELTE-SpamLevel: X-ELTE-SpamCheck: no X-ELTE-SpamVersion: ELTE 2.0 X-ELTE-SpamCheck-Details: score=-1.5 required=5.9 tests=BAYES_00 autolearn=no SpamAssassin version=3.1.7-deb -1.5 BAYES_00 BODY: Bayesian spam probability is 0 to 1% [score: 0.0000] Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1031 Lines: 27 * Jeremy Fitzhardinge wrote: > Ingo Molnar wrote: > > that's totally broken then. You cannot create an SMP-safe monotonic > > clocksource via interpolation - native does not do it either. Good thing > > this problem got exposed, it needs to be fixed. > > > > Sigh, I don't really want to have this fight again. i dont remember us having discussed this before, ever. If there's any "fight" about monotonicity and SMP then it would be a pretty onesided affair, with you being beaten up seriously ;-) > I don't really see what point there is in raising the tsc's rating > (why is 300 insufficient again?), but regardless of the value, the Xen > clocksource rating needs to be higher. anyway, i agree that this patch cannot go in in its current form. Ingo - 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/