Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751886AbWJ1HOJ (ORCPT ); Sat, 28 Oct 2006 03:14:09 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751887AbWJ1HOJ (ORCPT ); Sat, 28 Oct 2006 03:14:09 -0400 Received: from smtp.osdl.org ([65.172.181.4]:14539 "EHLO smtp.osdl.org") by vger.kernel.org with ESMTP id S1751886AbWJ1HOI (ORCPT ); Sat, 28 Oct 2006 03:14:08 -0400 Date: Sat, 28 Oct 2006 00:13:16 -0700 From: Andrew Morton To: thockin@hockin.org Cc: Andi Kleen , Sergio Monteiro Basto , Lee Revell , Chris Friesen , linux-kernel , john stultz Subject: Re: AMD X2 unsynced TSC fix? Message-Id: <20061028001316.928e85e8.akpm@osdl.org> In-Reply-To: <20061028064924.GA9127@hockin.org> References: <1161969308.27225.120.camel@mindpipe> <1161986902.27225.206.camel@mindpipe> <1162007907.26022.13.camel@localhost.localdomain> <200610272106.13115.ak@suse.de> <20061028063524.GA7669@hockin.org> <20061027234615.791b3942.akpm@osdl.org> <20061028064924.GA9127@hockin.org> X-Mailer: Sylpheed version 2.2.7 (GTK+ 2.8.17; x86_64-unknown-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1252 Lines: 30 On Fri, 27 Oct 2006 23:49:24 -0700 thockin@hockin.org wrote: > On Fri, Oct 27, 2006 at 11:46:15PM -0700, Andrew Morton wrote: > > On Fri, 27 Oct 2006 23:35:24 -0700 > > thockin@hockin.org wrote: > > > > > On Fri, Oct 27, 2006 at 09:06:12PM -0700, Andi Kleen wrote: > > > > > > > > > So far, has I can understand. Seems to me that my computer which have a > > > > > Pentium D (Dual Core) on VIA chipset, also have unsynchronized TSC and > > > > > with the patch of hrtimers on > > > > > > > > Intel systems (except for some large highend systems) have synchronized TSCs. > > > > > > Does Intel guarantee that, or is that just what we happen to see, so far. > > > > Matthias has a Xeon machine on which the TSCs are unsynced, and which are > > unsyncable - write_tsc() just doesn't do anything. See thread at > > http://lkml.org/lkml/2006/7/22/104 > > Nothing at all, or just the the low few bits are writeable? We don't know - the tsc sync code doesn't remeasure the errors after "correcting" them. - 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/