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    SubjectRe: i386 PDA patches use of %gs

    * Jeremy Fitzhardinge <jeremy@goop.org> wrote:

    > Ingo Molnar wrote:
    > > i'd not even use glibc's %gs but set up two separate selectors.
    > > (that's a more controlled experiment - someone might run a non-TLS
    > > glibc, etc.)
    > >
    >
    > Well, in that case they probably don't care whether the kernel uses
    > %fs or %gs ;)
    >
    > But either way, this doesn't have much bearing on Eric's test; we'd be
    > only talking about a few ns per kernel exit, rather than 5% for
    > read/write.

    if the timings are different then it very much has bearing on the
    argument that i made against the current i386 PDA patchset, that mixed
    use segments are suboptimal.

    So i'm NAK-ing the i386 PDA patchset until this has been properly
    measured (and fixed if needed).

    Ingo
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