[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] RE: [Xen-devel] Re: time drift on dom0
> > I've been using Xen exclusively on one of my machines for the past > > couple of weeks and I've also noticed a time drift. I've noticed it > > more as minutes over the course of a week. I thought it was just my > > hardware dying... > > > > I've seen this on 2.0.2 with 2.6.9 and 2.0.3 with 2.6.10. > > It's probably losing some timer interrupts. The lost tick handling > in Linux is not very clever and results in drifting time. The arch/xen patches to Linux effectively do away with the need for a periodic ticker, so it's not a lost interrupt issue. If you run NTP in dom0 the problem should go away for all domains. Free-running from the PIT timer is typically only accurate to about 100ppm, which is about a minute a week. However, there are a couple of things we could do to reduce some of the systematic error in setting the PIT frequency, but this is well under 10ppm as I recall. Ian ------------------------------------------------------- The SF.Net email is sponsored by: Beat the post-holiday blues Get a FREE limited edition SourceForge.net t-shirt from ThinkGeek. It's fun and FREE -- well, almost....http://www.thinkgeek.com/sfshirt _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxxxx https://lists.sourceforge.net/lists/listinfo/xen-devel
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