> On Jan 22, 2013, at 2:40 AM, Adrian Chadd <[email protected]> wrote:> > > On Jan 21, 2013, at 4:33 AM, Daniel Braniss <[email protected]> wrote: > > > >> host: DELL PowerEdge R710, 16GB, > > I administer a Dell PowerEdge R710 and I've been seeing the exact same > =thing. It's currently running FreeBSD 9.0-STABLE #0 r236355. It has a =ZFS > pool which sees moderate load most of the time but can be very high =at times > (when certain scripts run, etc.). I hadn't previously =correlated the issue > with ZFS load but that is very possible.> > I set a cron job to restart ntpd > when it dies (because the time =difference exceeds the sanity check). The > cron job runs "every 20 =minutes", but that varies greatly when the system > stops counting. The =time offset from ntpdate (which the script runs before > restarting ntpd) =varies a lot, but always in increments of 300 seconds. I've > seen =everything from 1200 to 23100. (Yes, that's 23 thousand seconds aka 6 > =hours 25 minutes that the system wasn't keeping time for.) > > Sysctl kern.timecounter.hardware defaults to HPET. I experimented with > =setting it to ACPI-fast but the issue persisted so I put it back. > kern.timecounter.choice: TSC-low(-100) ACPI-fast(900) HPET(950) i8254(0) > =dummy(-1000000)> > I first installed the box with an older 9.0-STABLE and > this issue was =not present. I have been tracking -STABLE on it (albeit > irregularly) so =I'm not sure when the issue came up. > > > Have you run tests with the machdep.idle value changed, and fiddling > > kern.eventtimer.periodic / kern.eventtimer.idletick ? > > I would love to resolve this and am able to do some experimenting. I've > =_usually_ been seeing the issue 2-3 times every 1-2 days, but I did just > =make some changes: > disabling ZFS compression and deduplication on all pools > updated to 9.1-STABLE from yesterday (r245821) > > If the issue persists I will try changing some of the sysctls above and > =follow up with the result. If it goes away, I'll try to remember to =report > that too. > > JN >
set kern.eventtimer.timer=LAPIC this solved it for me. danny _______________________________________________ [email protected] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-stable To unsubscribe, send any mail to "[email protected]"
