DragonflyBSD kernel clock improvements
don at sandvine.com
Sat Jan 24 10:55:01 PST 2004
> From: Bill Moran [mailto:wmoran at potentialtech.com]
> Hello all,
> I saw this recently:
> I was wondering if anyone on the FreeBSD team has looked at
> this. It doesn't
> appear as if any recent change have been made in the FreeBSD
> tree regarding
> It's probably not a big deal, but I just thought I'd point it out.
I think its important, we do have some persistent time problems
which seem to require kern.timecounter.method=1 to work around.
I think an increased focus on clock accuracy and jitter can't
be a bad thing, even if FreeBSD is not a real time system.
increasing the repeatability is good for DEVICE_POLLING, for
tcp timers, etc. As more and more things move out from under the
giant lock, events can become increasingly deterministic.
Glad to see someone is putting a scientific method to the
problem, it provides a good baseline for increasing the accuracy
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