Date: Sat, 24 Jan 2004 13:52:58 -0500 From: Don Bowman <don@sandvine.com> To: 'Bill Moran' <wmoran@potentialtech.com>, current@freebsd.org Subject: RE: DragonflyBSD kernel clock improvements Message-ID: <FE045D4D9F7AED4CBFF1B3B813C85337035E4680@mail.sandvine.com>
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> From: Bill Moran [mailto:wmoran@potentialtech.com] > > Hello all, > > I saw this recently: > http://www.dragonflybsd.org/Docs/nanosleep/ > > 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 > this. > > 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 (http://lists.freebsd.org/pipermail/freebsd-stable/2003-November/005194.html ) 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 of measurements. --don
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