On 05/27/2010 12:12 PM, Bernhard Schmidt wrote:
On 27.05.2010 23:53, Zachary Amsden wrote:
Hello Zachary,
I have server side fixes for this kvm-clock which seem to give me a
stable clock on this machine, but for true SMP stability, you will need
Glauber's guest side changes to kvmclock as well. It is impossible to
guarantee strictly monotonic clocksource across multiple CPUs when
frequency is dynamically changing (and also because of the C1E idle
problems).
Is all this relevant only when the host is on TSC? Because I have seen
these jumps when the host was on HPET and the guests were using
kvm-clock.
It doesn't matter what the host uses (although the host on TSC with
unstable TSC can make things worse), tsc and kvmclock sources in the
guest will be unstable regardless.
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