Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932310AbVICESr (ORCPT ); Sat, 3 Sep 2005 00:18:47 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S932372AbVICESr (ORCPT ); Sat, 3 Sep 2005 00:18:47 -0400 Received: from omta04ps.mx.bigpond.com ([144.140.83.156]:17249 "EHLO omta04ps.mx.bigpond.com") by vger.kernel.org with ESMTP id S932310AbVICESq (ORCPT ); Sat, 3 Sep 2005 00:18:46 -0400 Message-ID: <43192423.2040400@bigpond.net.au> Date: Sat, 03 Sep 2005 14:18:43 +1000 From: Peter Williams User-Agent: Mozilla Thunderbird 1.0.6-1.1.fc4 (X11/20050720) X-Accept-Language: en-us, en MIME-Version: 1.0 To: Lee Revell CC: vatsa@in.ibm.com, linux-kernel@vger.kernel.org, arjan@infradead.org, s0348365@sms.ed.ac.uk, kernel@kolivas.org, tytso@mit.edu, cfriesen@nortel.com, trenn@suse.de, george@mvista.com, johnstul@us.ibm.com, akpm@osdl.org Subject: Re: [PATCH 1/3] Updated dynamic tick patches - Fix lost tick calculation in timer_pm.c References: <20050831165843.GA4974@in.ibm.com> <20050831171211.GB4974@in.ibm.com> <1125720301.4991.41.camel@mindpipe> In-Reply-To: <1125720301.4991.41.camel@mindpipe> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-Authentication-Info: Submitted using SMTP AUTH PLAIN at omta04ps.mx.bigpond.com from [147.10.133.38] using ID pwil3058@bigpond.net.au at Sat, 3 Sep 2005 04:18:44 +0000 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1144 Lines: 30 Lee Revell wrote: > On Wed, 2005-08-31 at 22:42 +0530, Srivatsa Vaddagiri wrote: > >>With this patch, time had kept up really well on one particular >>machine (Intel 4way Pentium 3 box) overnight, while >>on another newer machine (Intel 4way Xeon with HT) it didnt do so >>well (time sped up after 3 or 4 hours). Hence I consider this >>particular patch will need more review/work. >> > > > Are lost ticks really that common? If so, any idea what's disabling > interrupts for so long (or if it's a hardware issue)? And if not, it > seems like you'd need an artificial way to simulate lost ticks in order > to test this stuff. In my experience, turning off DMA for IDE disks is a pretty good way to generate lost ticks :-) Peter -- Peter Williams pwil3058@bigpond.net.au "Learning, n. The kind of ignorance distinguishing the studious." -- Ambrose Bierce - 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/