Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1760490AbXEYIZE (ORCPT ); Fri, 25 May 2007 04:25:04 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752267AbXEYIYu (ORCPT ); Fri, 25 May 2007 04:24:50 -0400 Received: from holomorphy.com ([66.93.40.71]:44398 "EHLO holomorphy.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752321AbXEYIYt (ORCPT ); Fri, 25 May 2007 04:24:49 -0400 Date: Fri, 25 May 2007 01:25:37 -0700 From: William Lee Irwin III To: Andi Kleen Cc: Ingo Molnar , Satyam Sharma , Andrew Morton , linux-kernel@vger.kernel.org, Peter Zijlstra Subject: Re: [patch] i386, numaq: enable TSCs again Message-ID: <20070525082537.GZ19966@holomorphy.com> References: <20070525071005.GA6431@elte.hu> <20070525073158.GB8094@one.firstfloor.org> <20070525073957.GA15207@elte.hu> <20070525074316.GA16821@elte.hu> <20070525074915.GA18400@elte.hu> <20070525075446.GA20140@elte.hu> <20070525080827.GA22399@elte.hu> <20070525081944.GZ31925@holomorphy.com> <20070525082259.GH8094@one.firstfloor.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20070525082259.GH8094@one.firstfloor.org> Organization: The Domain of Holomorphy User-Agent: Mutt/1.5.13 (2006-08-11) Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1298 Lines: 28 On Fri, May 25, 2007 at 01:19:44AM -0700, William Lee Irwin III wrote: >> I remember. It was far beyond "slightly async;" they would drift >> minutes apart during reasonable amounts of uptime, though it would take >> at least several days to drift so far (I don't recall how long it took). On Fri, May 25, 2007 at 10:22:59AM +0200, Andi Kleen wrote: > sched_clock should handle that. On Fri, May 25, 2007 at 01:19:44AM -0700, William Lee Irwin III wrote: >> TSC synchronization is uniformly impossible on NUMA-Q. Bootlogs showing >> the results of the attempts are still extant. They shouldn't end up too >> far apart right after booting, but I don't have even ballpark estimates. >> I'd hazard a guess of a few seconds. On Fri, May 25, 2007 at 10:22:59AM +0200, Andi Kleen wrote: > You should mark_tsc_instable(), but not tsc disable. In a release or two > hopefully even that will be obsolete. I don't have any particular preference here. I'm just donating a memory dump. I have no intention of attempting to maintain NUMA-Q support code. -- wli - 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/