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    SubjectUSB making time drift [was Re: dynamic-hz]
    Hi!

    > On Tue, Dec 14, 2004 at 10:59:39AM +0100, Pavel Machek wrote:
    > > Are you using CONFIG_HPET_TIMER by chance? It seems to be missing some
    > > strategic -1, TSC (etc) get it right.
    >
    > I'm not using hpet because it's an old hardware, this is with timer_tsc.
    > It must be reproducible in any machine out there, especially with
    > machines with usb it should be reproducible even without any userspace
    > testcase doing iopl/cli/sti. Time will go silenty in the future at every
    > usb irq (they often last 3/4msec).

    How much drift do you see?

    I have machine with UHCI here, and am using usb most of the time
    (bluetooth for gprs connection), and did not notice too bad
    drift. ntpdate does some adjustment each time I connect to the
    network, but it

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