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    SubjectRe: X15 alpha release: as fast as TUX but in user space (fwd)
    From my experience system calls are not an issue.

    What costs a lot is moving data around, since modern CPUs spend most of their
    time in memory/bus wait cycles...

    - Fabio

    Linus Torvalds wrote:

    > >I think that applies to all really high-performance servers.
    >
    > Note that it is definitely not always true.
    >
    > Linux system calls are reasonably light-weight. And sometimes trying to
    > avoid them ends up beaing _more_ work - because you might have to worry
    > about synchronization and cache coherency in user mode.
    >
    > So the rule should be "avoid _unnecessary_ system calls".
    >
    > Linus
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