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    SubjectRe: Why HZ on i386 is 100 ?
    Hi!

    > Davide> i still have pieces of paper on my desk about tests done on
    > Davide> my dual piii where by hacking HZ to 1000 the kernel build
    > Davide> time went from an average of 2min:30sec to an average
    > Davide> 2min:43sec. that is pretty close to 10%
    >
    > The last time I measured timer tick overhead on ia64 it was well below
    > 1% of overhead. I don't really like using kernel builds as a
    > benchmark, because there are far too many variables for the results to
    > have any long-term or cross-platform value. But since it's popular, I
    > did measure it quickly on a relatively slow (old) Itanium box: with
    > 100Hz, the kernel compile was about 0.6% faster than with 1024Hz
    > (2.4.18 UP kernel).

    .5% still looks like a lot to me. Good compiler optimization is .5% on
    average...

    And think what it does with old 386sx.. Maybe time for those "tick on demand"
    patches?
    Pavel
    --
    Philips Velo 1: 1"x4"x8", 300gram, 60, 12MB, 40bogomips, linux, mutt,
    details at http://atrey.karlin.mff.cuni.cz/~pavel/velo/index.html.

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