On Fri, Jul 16, 2010 at 11:47:23PM +0300, Alexander Motin wrote: > > It is probably hard to see pattern due to to very high clock frequency. > But TSC timecounter is unreliable even on real SMP systems. What it > counts on virtual SMP - even bigger question. As system seems never uses > timecounters with negative quality - you've left with > kern.timecounter.hardware=dummy - that's why time is not going. As last > resort you may try to set sysctl kern.timecounter.hardware=TSC in run time.
I came across the same problem on rootbsd a few days ago, and set the TSC as the timecounter in /etc/sysctl.conf - I've since found it should be possible to also set kern.timecounter.smp_tsc=1 in /boot/loader.conf to let the TSC be chosen. The system's now been running for a day and I've not had any warnings about the clock going backward, and since the time has remained correct I guess Xen synchronises with the host? Should I still switch back to using the i8254? -- Bruce Cran _______________________________________________ freebsd-current@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-current To unsubscribe, send any mail to "freebsd-current-unsubscr...@freebsd.org"
