Messages in this thread |  | | Date | Sun, 11 Feb 2001 12:06:14 +0100 | From | Pavel Machek <> | Subject | Re: [OT] Major Clock Drift |
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Hi!
> > > > >I've discovered that heavy use of vesafb can be a major source of clock > > > > >drift on my system, especially if I don't specify "ypan" or "ywrap". On my > > > > > > > > This is extremely interesting. What version of ntp are you using? > > > > > > Is vesafb one of the drivers which blocks interrupts for (many) tens > > > of milliseconds? > > > > Vesafb is happy to block interrupts for half a second. > > And has this been observed to cause clock drift?
YEs. I've seen time running 3 times slower. Just do cat /etc/termcap with loaded PCI bus. Yesterday I lost 20 minutes during 2 hours -- I have been using USB (load PCI) and framebuffer. Pavel -- The best software in life is free (not shareware)! Pavel GCM d? s-: !g p?:+ au- a--@ w+ v- C++@ UL+++ L++ N++ E++ W--- M- Y- R+ - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org Please read the FAQ at http://www.tux.org/lkml/
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