On 22.03.2010, at 10:15, Dor Laor wrote: > On 03/21/2010 01:29 PM, Thomas Løcke wrote: >> Hey, >> >> What is considered "best practice" when running a KVM host with a >> mixture of Linux and Windows guests? >> >> Currently I have ntpd running on the host, and I start my guests using >> "-rtc base=localhost,clock=host", with an extra "-tdf" added for >> Windows guests, just to keep their clock from drifting madly during >> load. >> >> But with this setup, all my guests are constantly 1-2 seconds behind >> the host. I can live with that for the Windows guests, as they are not > > Is it just during boot time? If you run ntpdate after the boot inside the guest, does the time is 100% in sync with the host from that moment on? > > Glauber once analyzed it and blames hwclock call in rc.sysinit In fact, my kvm-clock based guests lag about 1 second behind as well. I suppose there's some compensation code that doesn't work correctly. Alex-- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
