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Re: [Xen-devel] Re: [patch 14/21] Xen-paravirt: Add XEN config options and disableunsupported config options.

Dan Hecht wrote:

Yes, and regardless of whether you run your periodic timer slower than HZ, calibrating time in a VM is always difficult due to the fact the kernel is time sharing the physical cpu. Why not just ask the underlying hypervisor?

Upstream Xen does just that.

I'm guessing we'll want something similar for KVM paravirt.

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