On Thu, Apr 14, 2022 at 09:26:41PM -0000, Stuart Henderson wrote: > I have some OpenBSD guests in Proxmox VE 7.1-7 (pve-qemu-kvm_6.1.0) and > seeing pretty bad clock drift (50 seconds in ~7h uptime). ntpd can't cope > with it. From boot: > > 2022-04-14T13:58:19.844Z ntpd[26996]: adjusting local clock by 1.745061s > 2022-04-14T13:59:24.070Z ntpd[26996]: adjusting local clock by 1.504470s > 2022-04-14T14:03:51.176Z ntpd[26996]: adjusting local clock by 2.430486s > 2022-04-14T14:07:40.299Z ntpd[26996]: adjusting local clock by 2.411118s > 2022-04-14T14:11:51.540Z ntpd[26996]: adjusting local clock by 3.173884s > 2022-04-14T14:15:03.534Z ntpd[26996]: adjusting local clock by 3.109722s > 2022-04-14T14:16:04.848Z ntpd[26996]: adjusting local clock by 3.185755s > 2022-04-14T14:17:40.286Z ntpd[26996]: adjusting local clock by 3.575126s > 2022-04-14T14:18:45.582Z ntpd[26996]: adjusting local clock by 4.231518s > 2022-04-14T14:22:27.618Z ntpd[26996]: adjusting local clock by 4.231999s > 2022-04-14T14:25:41.618Z ntpd[26996]: adjusting local clock by 4.844904s > 2022-04-14T14:29:58.888Z ntpd[26996]: adjusting local clock by 4.451876s > 2022-04-14T14:32:41.628Z ntpd[26996]: adjusting local clock by 5.250357s > > etc. No difference whether qemu-ga is used or not. No difference between > passing through the real cpu type (i.e. cpu=host, Ryzen 5650G in this case) > and passing through as "common KVM processor". The guest does detect and > use pvclock(4). > > $ sysctl kern.timecounter > kern.timecounter.tick=1 > kern.timecounter.timestepwarnings=0 > kern.timecounter.hardware=pvclock0 > kern.timecounter.choice=i8254(0) pvclock0(1500) acpihpet0(1000) > acpitimer0(1000) > > Anyone have ideas of things I could try that are less wrong than > running rdate from cron? Thanks.
I have a -current built-a-week-ago guest on stock Debian KVM, no problems with time-keeping. It picks acpihpet as timecounter instead of pvclock: $ sysctl kern.timecounter kern.timecounter.tick=1 kern.timecounter.timestepwarnings=0 kern.timecounter.hardware=acpihpet0 kern.timecounter.choice=i8254(0) pvclock0(500) acpihpet0(1000) acpitimer0(1000)
