On 03/03/2011 02:06 AM, Nikola Ciprich wrote:
No worries. What mess?
twice sending the same mail, nevermind :)
I have two things you can try:
first is running a single VCPU guest, if you have not done so already.
yup, UP guest is fine, just SMP doesn't work.
Second is adding the bootparameter "clocksource=acpi_pm" to your guest
kernel.
yes, this makes SMP work too! I just realized when You were asking about current
clocksource, I told You only host source, not the guest. So I checked now,
and (at least for UP, I guess for SMP it's the same), the clocksource is
kvm-clock! So seems like it got broken with the TSC changes?
What is the exact kernel version you are using in the guest.
It appears that some earlier 32-bit versions of kvm-clock enabled
kernels are still missing the required atomic check for backwards-time
protection which would be needed on SMP. This explains why 64-bit is
fine, 32-bit is not.
Why this change triggers that problem still is a slight mystery,
logically it should only affect the system if you have an unstable TSC.
Zach
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