Avi, I don't think this causes such a huge performance regression. NOHZ makes the frequency of timer reads go down significantly.
As for constant tick guests, well, the impact will be similar to changing to SMP, since those fallback to ACPI timer anyway now. The C2 emulation is required by Ubuntu 7.10 for example, which refuses to process the CST notification. Stock Linux kernels (as old as 2.6.20) do mark C2 invalid upon the CST notification. -- -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html
