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    SubjectRe: [PATCH] tsc-disable_B9
    Alan Cox writes:
    > On Thu, 2002-08-15 at 17:56, Andrea Arcangeli wrote:
    > > sorry but I don't see the point of badtsc only in kernel.
    > >
    > > If the TSC is bad that will be in particular bad from userspace where
    > > there's no hope to know what CPU you're running on.
    > You can still do meaningful measurements for things like profiling
    > because the cpu hop is statistically uninteresting.

    There are kernel extensions around that handle process migration across
    CPUs while providing virtualised per-process TSC counts, and for which
    the TSCs do NOT need to be in perfect sync.

    Disabling user-space RDTSC just because the TSCs aren't in sync is stupid.

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