> We found that using an hrtimer enabled host with > CONFIG_HZ=1000 improves > things. However I don't think that it's as accurate as 7 > seconds in 20 > minutes (that's better than 1% accuracy), so probably more work is > needed in qemu to correct time drift. > Time virtualization for HVM is always a headache, no simple way can provide accurate source :-( Per current KVM time virtualization policy, drop of jiffies or redundant jiffies may happen frequently. BTW, even in Xen, we are not satisfied with the time virtualization especially for TSC timer. Some modification in guest Linux side is really needed, maybe somebody can bring this issue to virtualization mini summit?
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