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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] Could you please answer some questions regarding Solaris PVHVM pvclock support.
ä 2014/2/27 21:03, Stefano Stabellini åé: >I guest linux guest will do the same thing, rdtsc() fetch current timestamp from current running vCPU, TSC out-of-sync issue is still there. >It seems to me pvclock finally fix the time drift issue just because the workaround enforced as above, right?First you should know that TSC is not always guaranteed to be synchronized across multiple processors, especially on older systems. On "TSC-safe" systems, Xen would export a consistent TSC to guests, by setting the vtsc offset and scale appropriately. Stefano,Is there a easy way to check whether the system is "TSC-safe"? Do you mean "X86_FEATURE_TSC_RELIABLE" bit in "boot_cpu_data.x86_capability"? Thanks, Michael _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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