Messages in this thread | | | Date | Tue, 14 Dec 2004 23:02:39 +0100 | From | Pavel Machek <> | Subject | USB making time drift [was Re: dynamic-hz] |
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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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