Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757160AbYAOKR3 (ORCPT ); Tue, 15 Jan 2008 05:17:29 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1754324AbYAOKRW (ORCPT ); Tue, 15 Jan 2008 05:17:22 -0500 Received: from smtp2.linux-foundation.org ([207.189.120.14]:39900 "EHLO smtp2.linux-foundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751668AbYAOKRV (ORCPT ); Tue, 15 Jan 2008 05:17:21 -0500 Date: Tue, 15 Jan 2008 02:17:20 -0800 From: Andrew Morton To: "Denys Fedoryshchenko" Cc: linux-kernel@vger.kernel.org, Ingo Molnar , Thomas Gleixner Subject: Re: TSC && HPET calibration Message-Id: <20080115021720.ad71605f.akpm@linux-foundation.org> In-Reply-To: <20080110123612.M81049@visp.net.lb> References: <20080110123612.M81049@visp.net.lb> X-Mailer: Sylpheed 2.4.1 (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 List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1541 Lines: 35 On Thu, 10 Jan 2008 14:36:12 +0200 "Denys Fedoryshchenko" wrote: > Hi > > I have same issue, but it's never passed synchronization. > > Jan 10 12:59:44 visp-1 Time: tsc clocksource has been installed. > Jan 10 13:41:51 visp-1 ACPI: HPET 000F29CD, 0038 (r1 DELL PE_SC3 1 > DELL 1) > Jan 10 13:41:51 visp-1 ACPI: HPET id: 0x8086a201 base: 0xfed00000 > Jan 10 13:41:51 visp-1 hpet clockevent registered > Jan 10 13:41:51 visp-1 checking TSC synchronization [CPU#0 -> CPU#1]: passed. > Jan 10 13:41:51 visp-1 checking TSC synchronization [CPU#0 -> CPU#2]: > Jan 10 13:41:51 visp-1 Measured 1020 cycles TSC warp between CPUs, turning > off TSC clock. > Jan 10 13:41:51 visp-1 Marking TSC unstable due to: check_tsc_sync_source > failed. > Jan 10 13:41:51 visp-1 hpet0: at MMIO 0xfed00000, IRQs 2, 8, 0 > Jan 10 13:41:51 visp-1 hpet0: 3 64-bit timers, 14318180 Hz > Jan 10 13:41:51 visp-1 Time: hpet clocksource has been installed. > > grep Measures > Sep 19 14:31:28 visp-1 Measured 1044 cycles TSC warp between CPUs, turning > off TSC clock. > Sep 19 18:22:46 visp-1 Measured 996 cycles TSC warp between CPUs, turning off > TSC clock. > Sep 19 18:35:44 visp-1 Measured 1080 cycles TSC warp between CPUs, turning > off TSC clock. Which kernel version? -- 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/