Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932521AbWB1WA4 (ORCPT ); Tue, 28 Feb 2006 17:00:56 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S932334AbWB1WA4 (ORCPT ); Tue, 28 Feb 2006 17:00:56 -0500 Received: from 209-166-240-202.cust.walrus.com ([209.166.240.202]:63400 "EHLO mail1.telemetry-investments.com") by vger.kernel.org with ESMTP id S932521AbWB1WAz (ORCPT ); Tue, 28 Feb 2006 17:00:55 -0500 Date: Tue, 28 Feb 2006 17:00:54 -0500 From: "Bill Rugolsky Jr." To: Abdulla Bubshait Cc: Jason Baron , linux-kernel@vger.kernel.org Subject: Re: AMD64 X2 lost ticks on PM timer Message-ID: <20060228220054.GC23330@ti64.telemetry-investments.com> Mail-Followup-To: "Bill Rugolsky Jr." , Abdulla Bubshait , Jason Baron , linux-kernel@vger.kernel.org References: <200602280022.40769.darkray@ic3man.com> <20060227222152.GA26541@ti64.telemetry-investments.com> <200602281041.27960.darkray@ic3man.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <200602281041.27960.darkray@ic3man.com> User-Agent: Mutt/1.4.1i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1451 Lines: 33 On Tue, Feb 28, 2006 at 10:41:27AM +0300, Abdulla Bubshait wrote: > Unfortunately, I can't seem to find a way to force it to use hpet. Passing > 'notsc' and 'nopmtimer' I end up using PIT/TSC based timekeeping. TSC is > already known to have problems with dual core. But I will sit with it for a > while to see if it fairs better than the pm timer. > > Bill, What timer do you use, and do these lost ticks persist after sata_nv > interrupts stop? Sorry for the late reply. I'm using pmtimer (the default). I get lost ticks reported mostly in default_idle and __do_softirq. The machine is running PostgreSQL, so the Lost tick messages occur throughout the day, but they come frequently during our nightly cron jobs that do rsyncs, checksums, etc. So far today: rugolsky@ti88: awk '/Feb 28.*Lost.*timer/{n++;sum+=$8};END{printf "%d messages, %d lost ticks\n",n,sum}' /var/log/messages 487 messages, 588 lost ticks And this month: rugolsky@ti88: awk '/Feb .*Lost.*timer/{n++;sum+=$8};END{printf "%d messages, %d lost ticks\n",n,sum}' /var/log/messages* 19051 messages, 23794 lost ticks I got another test machine up and running today, so I can start patching and testing tomorrow. Bill Rugolsky - 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/