Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932421AbVIZHOX (ORCPT ); Mon, 26 Sep 2005 03:14:23 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S932423AbVIZHOX (ORCPT ); Mon, 26 Sep 2005 03:14:23 -0400 Received: from gockel.physik3.uni-rostock.de ([139.30.44.16]:9871 "EHLO gockel.physik3.uni-rostock.de") by vger.kernel.org with ESMTP id S932421AbVIZHOW (ORCPT ); Mon, 26 Sep 2005 03:14:22 -0400 Date: Mon, 26 Sep 2005 09:14:02 +0200 (CEST) From: Tim Schmielau To: Paul Blazejowski cc: LKML , Carlo Calica , xorg@lists.freedesktop.org Subject: Re: 2.6.14-rc2-mm1 In-Reply-To: <20050925220037.GA8776@blazebox.homeip.net> Message-ID: References: <20050925220037.GA8776@blazebox.homeip.net> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1751 Lines: 53 On Sun, 25 Sep 2005, Paul Blazejowski wrote: > Upon quick testing the latest mm kernel it appears there's some kind of > race condition when using dual core cpu esp when using XORG and USB > (although PS2 has same issue) kebyboard rate being too fast. Does the following patch by John Stultz fix the problem? Tim >From johnstul@us.ibm.com Mon Sep 26 09:04:08 2005 Date: Mon, 19 Sep 2005 12:16:43 -0700 From: john stultz To: Andrew Morton Cc: lkml , Andi Kleen Subject: [PATCH] x86-64: Fix bad assumption that dualcore cpus have synced TSCs Andrew, This patch should resolve the issue seen in bugme bug #5105, where it is assumed that dualcore x86_64 systems have synced TSCs. This is not the case, and alternate timesources should be used instead. For more details, see: http://bugzilla.kernel.org/show_bug.cgi?id=5105 Please consider for inclusion in your tree. thanks -john diff --git a/arch/x86_64/kernel/time.c b/arch/x86_64/kernel/time.c --- a/arch/x86_64/kernel/time.c +++ b/arch/x86_64/kernel/time.c @@ -959,9 +959,6 @@ static __init int unsynchronized_tsc(voi are handled in the OEM check above. */ if (boot_cpu_data.x86_vendor == X86_VENDOR_INTEL) return 0; - /* All in a single socket - should be synchronized */ - if (cpus_weight(cpu_core_map[0]) == num_online_cpus()) - return 0; #endif /* Assume multi socket systems are not synchronized */ return num_online_cpus() > 1; - 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/