Re: Time jumping forward issue under OpenBSD 6.6 VMM

2020-03-03 Thread Ian Gregory
On Tue, 3 Mar 2020 at 15:47, mabi wrote: > It looks like there is a time issue on that VM although I am running the > default ntpd of OpenBSD 6.6 and I have added the following parameter into my > /etc/sysctl.conf on that VM: > > kern.timecounter.hardware=tsc I've had similar issues with timeke

Re: pvclock stability

2019-11-19 Thread Ian Gregory
On Tue, 19 Nov 2019 at 21:20, Ian Gregory wrote: > I can > confirm that change resolved the precision issue described in the > linked thread, but it also seems to have resulted in much improved > clock stability (4 steps in 24hr, 1.0s, 1.0s, 0.5s, 0.5s). Correction - there wer

Re: pvclock stability

2019-11-19 Thread Ian Gregory
nt ntpd is able to keep the clock synced so in the absence of further lines of investigation I'm inclined to leave as-is and continue to monitor. I will update the list if I discover anything new. Ian On Fri, 15 Nov 2019 at 09:17, Ian Gregory wrote: > > I continued to investigate this

Re: pvclock stability

2019-11-15 Thread Ian Gregory
dvise if I've missed something? Happy to provide further data if needed. Thanks Ian On Fri, 8 Nov 2019 at 13:53, Ian Gregory wrote: > > Hi > > Since the 6.6 release I've been experimenting with using pvclock as > the selected timecounter on a virtual machine running under v

pvclock stability

2019-11-08 Thread Ian Gregory
Hi Since the 6.6 release I've been experimenting with using pvclock as the selected timecounter on a virtual machine running under vmm. Both the host and guest are running 6.6-stable (the environment is provided by openbsd.amsterdam). With 6.5 and the tsc source, the clock would drift linearly by