Date: Mon, 7 Jun 1999 16:37:07 -0400 (EDT) From: O Stockhammer <oliver@ancillary.inch.com> To: dwhite@resnet.uoregon.edu Cc: freebsd-questions@FreeBSD.ORG Subject: Re: question regarding 3.1-stable and drifting time clock. (fwd) Message-ID: <Pine.BSF.4.05.9906071633270.7283-100000@ancillary.inch.com>
next in thread | raw e-mail | index | archive | help
Doug, This is the timecounter info you asked for: Timecounter "i8254" frequency 1193182 Hz Timecounter "TSC" frequency 87498979 Hz CPU: Pentium/P54C (87.50-MHz 586-class CPU) Looks like I have the same type of problem. Oliver > > Hello, > I am running 3.1-stable on a Pentium 90. I get a wicked time > drift, something like 5 minutes fast every hour. It is not my bios clock > as that is keeping correct time (it is set to UTC). You too, eh? When you boot up, you should get a line like: Timecounter "TSC" frequency 100228262 Hz What does it report for the freq? Something is up with the 3.X TSC calibration and it causes timewarping clocks. I am running xntpd to > attempt to stop this and it is locally synching to another FBSD box which > is keeping accurate time. I have run tzsetup and set it to UTC as well > with EDT as the timezone. > When xntpd starts up it seems to be fine: > > Jun 2 16:10:37 ary xntpd[106]: xntpd version=3.4e (beta multicast); > Mon Feb 15 10:12:13 GMT 1999 (1) > Jun 2 16:10:37 ary xntpd[106]: tickadj = 5, tick = 10000, > tvu_maxslew = 495 > > But upon inspection of the time about an hour later, the clock has > drifted again 5 minutes fast and continues to drift about 5 minutes/hour. > There is no other logging in /var/log/messages from xntpd after > starting it. xntpd can slew it only so much. I'm trying xntpd on another problem box but I'm not sure it can keep up. > If I restart the machine and check the bios it is correctly set to > UTC and the accurate time. Is this a bug with 3.1-stable or am I missing > something? I'm not sure if this is due to flaky PC hardware or if it's an actual bug. Our P90 thinks it's a P87.5. I think I'll enter a PR on it to get the ball rolling. Doug White Internet: dwhite@resnet.uoregon.edu | FreeBSD: The Power to Serve http://gladstone.uoregon.edu/~dwhite | www.freebsd.org To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?Pine.BSF.4.05.9906071633270.7283-100000>