Date: Fri, 12 Feb 2010 17:44:52 +0100 From: Torfinn Ingolfsen <torfinn.ingolfsen@broadpark.no> To: freebsd-stable@freebsd.org Subject: Re: ntpd struggling to keep up - how to fix? Message-ID: <20100212174452.2140cd72.torfinn.ingolfsen@broadpark.no> In-Reply-To: <20100212131117.GA51905@icarus.home.lan> References: <20100211190652.6a66c618.torfinn.ingolfsen@broadpark.no> <20100211192515.GB13854@icarus.home.lan> <20100212132947.eb2af3d0.torfinn.ingolfsen@broadpark.no> <20100212131117.GA51905@icarus.home.lan>
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On Fri, 12 Feb 2010 05:11:17 -0800 Jeremy Chadwick <freebsd@jdc.parodius.com> wrote: > Please try doing this: > > - stop ntpd > - rm /var/db/ntpd.drift > - sysctl kern.timecounter.hardware=ACPI-safe > - start ntpd Thanks, I'm currently testing that. Results in 72 hours (or less) :-) > Then see if your clock drifts. If it stops, great -- you can put that > sysctl assignment line in /etc/sysctl.conf and consider it a done deal. > I highly recommend putting some comments around it though so in the > future you don't go "What's this? Silly!" and delete it. ;-) Yes, I know. Learned the hard way that I need to document things for my own use. :-) > I'll also point out that it's common on FreeBSD[1] to see messages > like the following (or at least it was circa 2006 -- I believe ntpd Yes, those messages are still there. At one time, I thought about fixing that (by using the config you present), but in the end I figured that these messages actually helps me in pinpointing time of crash in the (few) cases wherer one of my machines crashes or panics. So in the end I did nothing about it. > Finally, you should really consider adding some stratum 2 sources to > your list, *in addition* to the stratum 3 server you're already using. Well, the stratum 3 server is my firewall. :) All the machines on my LAN use that one as the ntp server. My firewall is currently using three ntp servers as sources, one is a non-public stratum 2 server (yes, I asked for permission before I started using it), one is the no.poool.ntp.org pool ( stratum 3) and I just found out that the third one has stopped responding. So I removed it. I have added the dk.pool.ntp.org and se.pool.ntp.org pools, we will see how that turns out. > ntpd can happily work with multiple servers, and will pick the best one Yes, I know. It is a few years since I set this up, but at that time I figured that if I use three ntp servers for my firewall, and just used the firewall for all my internal machines, that would be good enough for my uses. Perhaps I need to re-evaluate my needs. -- Regards, Torfinn
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