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    SubjectRe: [PATCH] i386-pda UP optimization
    Date
    On Wednesday 15 November 2006 18:20, Ingo Molnar wrote:
    >
    > * Andi Kleen <ak@suse.de> wrote:
    >
    > > On Wednesday 15 November 2006 12:27, Eric Dumazet wrote:
    > > > Seeing %gs prefixes used now by i386 port, I recalled seeing strange
    > > > oprofile results on Opteron machines.
    > > >
    > > > I really think %gs prefixes can be expensive in some (most ?) cases,
    > > > even if the Intel/AMD docs say they are free.
    > >
    > > They aren't free, just very cheap.
    >
    > Eric's test shows a 5% slowdown. That's far from cheap.

    I have my doubts about the accuracy of his test results. That is why I asked
    him to double check.

    -Andi
    -
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