From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751543AbVJ0Cd6 (ORCPT ); Wed, 26 Oct 2005 22:33:58 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751544AbVJ0Cd5 (ORCPT ); Wed, 26 Oct 2005 22:33:57 -0400 Received: from smtp08.wanadoo.nl ([194.134.35.149]:63240 "EHLO smtp08.wanadoo.nl") by vger.kernel.org with ESMTP id S1751543AbVJ0Cd5 (ORCPT ); Wed, 26 Oct 2005 22:33:57 -0400 Message-ID: <43603C93.1070109@lazarenko.net> Date: Thu, 27 Oct 2005 04:33:55 +0200 From: Vladimir Lazarenko User-Agent: Mozilla Thunderbird 1.0.7 (Windows/20050923) X-Accept-Language: en-us, en MIME-Version: 1.0 To: john stultz Cc: Linux kernel Subject: Re: 2.6.14-rc5 (i386) + TSC, how to disable? time drift References: <436029D4.9080601@lazarenko.net> <1130377451.27168.386.camel@cog.beaverton.ibm.com> In-Reply-To: <1130377451.27168.386.camel@cog.beaverton.ibm.com> Content-Type: multipart/signed; protocol="application/x-pkcs7-signature"; micalg=sha1; boundary="------------ms010806040205090603000406" X-Spam-Score: 0.1 (/) X-Spam-Report: Spam detection software, running on the system "dinosaur.lazarenko.net", has identified this incoming email as possible spam. The original message has been attached to this so you can view it (if it isn't spam) or label similar future email. If you have any questions, see the administrator of that system for details. Content preview: > On Thu, 2005-10-27 at 03:13 +0200, Vladimir Lazarenko wrote: > >>Hello, >> >>To continue on my struggle with Dual-core - another interesting issue >>popped up: time drift. >> >>SMP is enabled, TSC is enabled. > > > It looks like you have ACPI PM and HPET enabled in the kernel, so it > appears your system does not support alternative clocksources. > > You can check to see if a updated BIOS that makes ACPI PM or HPET > available to the OS has been released, or request one from your hardware > vendor. > > You might want to try idle=poll as well. [...] Content analysis details: (0.1 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- 0.1 AWL AWL: From: address is in the auto white-list Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org This is a cryptographically signed message in MIME format. --------------ms010806040205090603000406 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit > On Thu, 2005-10-27 at 03:13 +0200, Vladimir Lazarenko wrote: > >>Hello, >> >>To continue on my struggle with Dual-core - another interesting issue >>popped up: time drift. >> >>SMP is enabled, TSC is enabled. > > > It looks like you have ACPI PM and HPET enabled in the kernel, so it > appears your system does not support alternative clocksources. > > You can check to see if a updated BIOS that makes ACPI PM or HPET > available to the OS has been released, or request one from your hardware > vendor. > > You might want to try idle=poll as well. Thank you john. So far, idle=poll seemed to help, partially. The time doesn't go backwards for now, it only occasionally skips a second, every 2-3 minutes. Is that normal? Not that I have been watching seconds very closely at any previous moment, so I can't say if it has ever happened before. And I dont' know if this question can be addressed to you, but can you say something about those /proc/interrupts? Why don't I see any interrupts except LOC being handled by 2nd CPU core? Thanks in advance! 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