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    SubjectRE: Cyrix 6x86

    > I have a rev 2.7 chip. These changes seem to work ok, but there seems to be
    > NO difference in performance. In fact, even with the "6x86opt.zip" which
    > turns on lots of 6x86 features, there seems to be no difference. Kernel
    > compile (which is mostly CPU bound) takes just as long with as without.

    Most 6x86 BIOS' seem to enable most of the performance features
    anyway (not that is easy to benchmark the difference without
    using somewhat contrived code). The main difference comes from
    using VSPM to map the kernel and that only helps things that
    bounce around in kernel space pretty regularly. Larry McVoy's
    pipe bandwidth benchmark picks it up well (which also suggests
    that we could boost performance in the non-VSPM case by doing
    a code locality analysis of the kernel...)

    Mike

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    | Mike Jagdis | Internet: mailto:mike@roan.co.uk |
    | Roan Technology Ltd. | |
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