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    SubjectRe: [PATCH] scheduler patch, faster still
    On Tue, Sep 29, 1998 at 07:57:43AM -0700, D.A. Harris wrote:
    > Well, it wouldn't be waste if you are implementing a voice mail system for
    > say 400 users. If the RT stuff was stable and reliable you could challenge
    > Qunix in that market.

    RTlinux already does that. The reason why the RT stuff in RTLinux is not
    in the main kernel is that it is exceptionally difficult to make
    a time sharing general purpose kernel also do real-time.
    Scheduling may help, but there are serious problems with
    1. interrupt processing
    2. memory management
    3. the numerous shared data structures guarded by sleep

    Linux is designed to be non-preemptive in kernel mode. That's a common
    and smart design, but it makes "real-time" impossible. There is no
    point in putting racing tires on a Jeep.

    Victor Yodaiken
    Department of Computer Science
    New Mexico Institute of Mining and Technology
    Socorro NM 87801
    PowerPC Linux page
    Real-Time Page

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