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    SubjectRe: X15 alpha release: as fast as TUX but in user space (fwd)

    On Wed, 2 May 2001, Andi Kleen wrote:

    > > Whatever happened to that hack that was discussed a year or two ago?
    > > The one where (also on IA32) a magic page was set up by the kernel
    > > containing code for fast system calls, and the kernel would write
    > > calibation information to that magic page. The code written there
    > > would use the TSC in conjunction with that calibration data.
    > >
    > > There was much discussion about this idea, even Linus was keen on
    > > it. But IIRC, nothing ever happened.
    > It's already implemented in the x86-64 port, thanks to Andrea
    > Arcangelli.

    well, it was first prototyped in the vsyscall patches :-)


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