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    SubjectRe: Intel P6 vs P7 system call performance
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    On Tue, 2002-12-17 at 19:12, H. Peter Anvin wrote:
    > The complexity only applies to nonsynchronized TSCs though, I would
    > assume. I believe x86-64 uses a vsyscall using the TSC when it can
    > provide synchronized TSCs, and if it can't it puts a normal system call
    > inside the vsyscall in question.

    For x86-64 there is the hpet timer, which is a lot saner but I don't
    think we can mmap it


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