From owner-freebsd-smp Sun Jun 28 03:44:40 1998 Return-Path: Received: (from majordom@localhost) by hub.freebsd.org (8.8.8/8.8.8) id DAA02369 for freebsd-smp-outgoing; Sun, 28 Jun 1998 03:44:40 -0700 (PDT) (envelope-from owner-freebsd-smp@FreeBSD.ORG) Received: from zibbi.mikom.csir.co.za (zibbi.mikom.csir.co.za [146.64.24.58]) by hub.freebsd.org (8.8.8/8.8.8) with ESMTP id DAA02178 for ; Sun, 28 Jun 1998 03:42:55 -0700 (PDT) (envelope-from jhay@zibbi.mikom.csir.co.za) Received: (from jhay@localhost) by zibbi.mikom.csir.co.za (8.9.0/8.9.0) id MAA04522 for freebsd-smp@freebsd.org; Sun, 28 Jun 1998 12:42:31 +0200 (SAT) From: John Hay Message-Id: <199806281042.MAA04522@zibbi.mikom.csir.co.za> Subject: time problem? To: freebsd-smp@FreeBSD.ORG Date: Sun, 28 Jun 1998 12:42:31 +0200 (SAT) X-Mailer: ELM [version 2.4ME+ PL32 (25)] MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: owner-freebsd-smp@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.org Hi, I have found that my dual P5 100MHz machine will gain +- 0.85 seconds every now and again. I haven't been able to find out if there is a pattern yet. It seems to happen within a second or so, so it isn't that it slowly drifts. It happens on average a few times per day, but I have seen days where it hasn't happened at all. I first started to notice it in ntpd's logs, but I have since stopped using ntpd, to make sure that it isn't something that was induced by ntpd. I have also tried a non SMP kernel (with a hack to force it to also use 8254 for its time) and it does not seem to happen then, so it looks like it has something to do with the SMP code. It also does not seem to have anything to do with how busy the machine is, it has happened on a totally idle machine and also during a make world. Anybody have any ideas how I can look for this? I don't understand all the low level time stuff yet (especially the SMP side of it), but if given a little direction I'm willing to try a few things. John -- John Hay -- John.Hay@mikom.csir.co.za To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-smp" in the body of the message