Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S261596AbVEUUzJ (ORCPT ); Sat, 21 May 2005 16:55:09 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S261603AbVEUUzJ (ORCPT ); Sat, 21 May 2005 16:55:09 -0400 Received: from smtpout01-04.mesa1.secureserver.net ([64.202.165.79]:16337 "HELO smtpout01-04.mesa1.secureserver.net") by vger.kernel.org with SMTP id S261596AbVEUUzD (ORCPT ); Sat, 21 May 2005 16:55:03 -0400 Message-ID: <428F9FEE.5000003@coyotegulch.com> Date: Sat, 21 May 2005 16:54:06 -0400 From: Scott Robert Ladd User-Agent: Mozilla Thunderbird 1.0.2 (X11/20050512) X-Accept-Language: en-us, en MIME-Version: 1.0 To: Linux Kernel Mailing List Subject: Re: False "lost ticks" on dual-Opteron system (=> timer twice as fast) References: <200505081445.26663.bernd.paysan@gmx.de> In-Reply-To: X-Enigmail-Version: 0.90.2.0 X-Enigmail-Supports: pgp-inline, pgp-mime Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1522 Lines: 36 Bernd Paysan wrote: >>I've recently set up a dual Opteron RAID server (AMD-8000-based Tyan >>Thunder K8S Pro SCSI board, 2 246 Opterons, stepping 10). Kernel is a >>modified 2.6.11.4-20a from SuSE 9.3 (SMP version, sure). The Opterons >>are capable of changing the CPU frequency (between 1GHz and 2GHz). >> >>What I can't believe is that I'm the only one who has this problem. Hendrik Visage wrote: > I'll be delving deeper into this thread soon, but I'm seeing similar > strangeness > on a Athlon64 (rated:3G+ real:2009MHz clock), 2.6.11-r8 (gentoo), MSI > K8N Neo Platinum. > > ntp syncs time, then I start a couple of compiles, and I see ntp > losing track of time, big jitter etc. (and the one time source is in > on the local LAN syncing to the same remote servers). openntp I > noticed it also. > > What I have noticed in my dmesg output is that I see "lost timer ticks > CPU Frequency change?" messages very early in the boot up. > > I've seen this for about a week or three, and somehow I believe it > wasn't a problem before 2.6.11. I *don't* have any timer problems running 2.6.11-r8 (gentoo) on a dual Opteron 250 system using a Tyan K8W 2885. Perhaps the problem is that the two of you are running SCSI main drives, and I'm not? ..Scott - 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/