* Allan Jude ([email protected]) wrote: > > I'm running a bunch of FreeBSD VMs on VPS provider which uses KVM. > > Recently one of them began bahaving strangely. Symptoms: > > > > - Much ~(30%) CPU spent in intr > > - top shows CPU used by "intr{swi4: clock (0)}" > > - kernel: calcru: runtime went backwards from 13958 usec to 10792 usec for > > pid 919 (sshd) > > messages in logs > > - There's no much load, no high network traffic, systat shows no excess > > interrupts. > > - This intr load is sporadic in form of ~30 minute busts each several > > hours > > - The box had ntpd running, but disabling it doesn't help > > - Playing with timer-related sysctls does not help either > > > > I've tried i8254 and TSC-low timecounters: > > > > kern.timecounter.hardware: ACPI-fast > > kern.timecounter.choice: TSC-low(800) i8254(0) ACPI-fast(900) > > dummy(-1000000) > > > > and kern.eventtimer.periodic=1 > > > > to no effect. > > > > > > I suspect that this began after some changes on the hoster's side. > > > > - This VM was working for more than a year without problems before > > - A graph which monitors a reply time of website running on that VM > > showed min. response time jump from 50 to 75 msec on Monday, after > > which problems began. > > > > So while I'm getting the hoster to tell me what they have changed, any > > ideas? > > > > Look at: > kern.eventtimer.choice > > and try different kern.eventtimer.timer values
Thank you. kern.eventtimer.choice: LAPIC(400) i8254(100) RTC(0) kern.eventtimer.timer was LAPIC, trying i8254. -- Dmitry Marakasov . 55B5 0596 FF1E 8D84 5F56 9510 D35A 80DD F9D2 F77D [email protected] ..: jabber: [email protected] http://amdmi3.ru _______________________________________________ [email protected] mailing list https://lists.freebsd.org/mailman/listinfo/freebsd-virtualization To unsubscribe, send any mail to "[email protected]"
