Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753936Ab2BSMv5 (ORCPT ); Sun, 19 Feb 2012 07:51:57 -0500 Received: from mx2.mail.elte.hu ([157.181.151.9]:38147 "EHLO mx2.mail.elte.hu" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753389Ab2BSMv4 (ORCPT ); Sun, 19 Feb 2012 07:51:56 -0500 Date: Sun, 19 Feb 2012 13:51:32 +0100 From: Ingo Molnar To: Dimitri Sivanich Cc: Thomas Gleixner , Ingo Molnar , "H. Peter Anvin" , John Stultz , x86@kernel.org, linux-kernel@vger.kernel.org, Jack Steiner Subject: Re: [PATCH] x86 uv: lower UV rtc clocksource rating Message-ID: <20120219125132.GC25900@elte.hu> References: <20120216201042.GA10260@sgi.com> <20120217120242.GC25601@elte.hu> <20120217141641.GA28063@sgi.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20120217141641.GA28063@sgi.com> User-Agent: Mutt/1.5.21 (2010-09-15) X-ELTE-SpamScore: -2.0 X-ELTE-SpamLevel: X-ELTE-SpamCheck: no X-ELTE-SpamVersion: ELTE 2.0 X-ELTE-SpamCheck-Details: score=-2.0 required=5.9 tests=AWL,BAYES_00 autolearn=no SpamAssassin version=3.3.1 -2.0 BAYES_00 BODY: Bayes spam probability is 0 to 1% [score: 0.0000] 0.0 AWL AWL: From: address is in the auto white-list Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 935 Lines: 28 * Dimitri Sivanich wrote: > On Fri, Feb 17, 2012 at 01:02:42PM +0100, Ingo Molnar wrote: > > > > * Dimitri Sivanich wrote: > > > > > Lower the rating of the UV rtc clocksource to just below that of the tsc. > > > > This changelog is deficient for obvious reasons, mind updating > > it? > > > OK. Is this sufficient? > > > Lower the rating of the UV rtc clocksource to just below that of the tsc. > > Reading the tsc clocksource has lower latency than reading the rtc, so favor > it in situations where it is synchronized and stable. When the tsc is > unsynchronized, the rtc needs to be the chosen clocksource. Yeah, perfect, thanks. 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/