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1b1ed1a
(Get the code!)
Well, I think there are actually two things at play in this BZ. The original request is to shift from using CPUID to serialize gettimeofday to using MFENCE/LFENCE for serializing. This should be faster under *full* virtualization, so a backport to RHEL-5 might be desirable.
Comment #3, however, talks about something different. In particular, it's talking about the Xen kernel, which does indeed have the vsyscall stuff off in 64-bit. I'm not entirely sure why; I don't think segmentation protection should have anything to do with it. In a quick test, I turned it on, and your little benchmark there went from 2m17s on this box to about 30s. I'm going to make a new BZ about that issue, since it doesn't really belong here.
Chris Lalancette