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    SubjectRe: Context switch times
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       From: Richard Gooch <rgooch@ras.ucalgary.ca>
    Date: Thu, 4 Oct 2001 15:39:05 -0600

    David S. Miller writes:
    > lat_ctx doesn't execute any FPU ops. So at worst this happens once
    > on GLIBC program startup, but then never again.

    Has something changed? Last I looked, the whole lmbench timing harness
    was based on using the FPU.

    Oops, that's entirely possible...

    But things are usually layed out like this:

    capture_start_time();
    context_switch_N_times();
    capture_end_time();

    So the FPU hit is only before/after the runs, not during each and
    every iteration.

    Franks a lot,
    David S. Miller
    davem@redhat.com
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