Wondering if a user-space gettimofday() for kvm-clock has been
considered before. I am seeing a pretty large difference in performance
between tsc and kvm-clock. I have to assume at least some of this is
due to the mode switch for kvm-clock. Here are the results:
(this is a 16 vCPU VM on a 16 thread 2S Nehalem-EP host, looped
gettimeofday() calls on all vCPUs)
tsc: .0645 usec per call
kvm-clock: .4222 usec per call (6.54x)
-Andrew Theurer
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