From owner-freebsd-alpha Mon Nov 11 14: 0: 5 2002 Delivered-To: freebsd-alpha@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id B2A2537B401 for ; Mon, 11 Nov 2002 14:00:04 -0800 (PST) Received: from duke.cs.duke.edu (duke.cs.duke.edu [152.3.140.1]) by mx1.FreeBSD.org (Postfix) with ESMTP id 3DE2543E75 for ; Mon, 11 Nov 2002 14:00:00 -0800 (PST) (envelope-from gallatin@cs.duke.edu) Received: from grasshopper.cs.duke.edu (grasshopper.cs.duke.edu [152.3.145.30]) by duke.cs.duke.edu (8.9.3/8.9.3) with ESMTP id QAA03128; Mon, 11 Nov 2002 16:59:56 -0500 (EST) Received: (from gallatin@localhost) by grasshopper.cs.duke.edu (8.11.6/8.9.1) id gABLxQ548342; Mon, 11 Nov 2002 16:59:26 -0500 (EST) (envelope-from gallatin@cs.duke.edu) From: Andrew Gallatin MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Message-ID: <15824.10302.110339.545856@grasshopper.cs.duke.edu> Date: Mon, 11 Nov 2002 16:59:26 -0500 (EST) To: "Michael A. Mackey" Cc: freebsd-alpha@FreeBSD.ORG Subject: Re: Extreme time drift in SMP mode In-Reply-To: <1037050487.14529.17.camel@focaccia.> References: <1037050487.14529.17.camel@focaccia.> X-Mailer: VM 6.75 under 21.1 (patch 12) "Channel Islands" XEmacs Lucid Sender: owner-freebsd-alpha@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.org Michael A. Mackey writes: > I have recently installed 5.0-CURRENT onto my AlphaServer 2100A. When > running an SMP kernel, the time drift is very large. > > I am running ntpd, but it doesn't correct the error in system time. > > The only solution: use CRON to run ntpdate (this prevents ntpd from > running) efvery few minutes. This solution is much less than desirable, > as I won;t this box to run kerberos. > > Is there some solution to this problem? Nothing other than disabling SMP.. FWIW, it only happens on 2100s. Those machines are evil. Its been a while since I've played w/it. What does this say: /usr/bin/time sleep 10 Also, how many CPUs do you have? Drew To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-alpha" in the body of the message