Date: Mon, 8 Feb 1999 22:26:25 -0500 (EST) From: Chuck Robey <chuckr@mat.net> To: "William S. Duncanson" <caesar@starkreality.com> Cc: freebsd-smp@FreeBSD.ORG Subject: Re: Problems keeping time Message-ID: <Pine.BSF.4.05.9902082225390.338-100000@picnic.mat.net> In-Reply-To: <4.1.19990208211126.00c5ab40@fire.starkreality.com>
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On Mon, 8 Feb 1999, William S. Duncanson wrote: > Hmm...doesn't appear to be working. I'm grepping through the source trying > to find the valid values for this parameter, but haven't been able to find > it yet. I've seen his posting, that WAS the other valid value. > > At 20:02 2/8/99 -0500, Chuck Robey wrote: > >On Mon, 8 Feb 1999, William S. Duncanson wrote: > > > >> I just upgraded a FreeBSD box to a SMP system (basically, I swapped out the > >> MB and added a processor). Now, I'm having horrendous problems with the > >> kernel clock drifting (it's running fast, about 7 seconds every 10 > >> minutes). So far, xntpd seems to be keeping everything relatively close, > >> but it's updating the clock every 10 minutes or so. ntpq claims that all > >> of the configured peers are "insane". I'm pretty sure that this is a SMP > >> issue, since it worked fine with a single processor (4.0-current). So, the > >> question is, how do I fix this? > >> > >> Here's my kernel config. I added the "CLK_USE_I8254_CALIBRATION" after I > >> noticed the problem, but it doesn't appear to have fixed it: > > > >I have a smp system too. I've never had to use this method, but I > >recall Poul-Henning talking about it, so I'll pass it on. You can tweak > >the method used to keep time via a sysctl: > > > >sysctl -w kern.timecounter.method=1 > > > >I don't know more than that, you can either experiment (and let us know > >if it worked) or wait for Poul-Henning to comment. ----------------------------+----------------------------------------------- Chuck Robey | Interests include any kind of voice or data chuckr@glue.umd.edu | communications topic, C programming, and Unix. 213 Lakeside Drive Apt T-1 | Greenbelt, MD 20770 | I run picnic (FreeBSD-current) (301) 220-2114 | and jaunt (Solaris7). ----------------------------+----------------------------------------------- To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-smp" in the body of the message
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