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    SubjectRe: SCO: "thread creation is about a thousand times faster than onnative Linux"

    Tigran,

    One other area whee Linux could get into trouble. Unixware does not
    implement a spin_lock reader/writer lock nor does it implement spin_lock
    style barrier synch object (from UI). Some of their kernel apps will
    barf if they use the reader/writer locks in Linux. Their kernel cannot
    support cases where spin_lock() style reader/writer locks are used.

    They also implemet priority inheritance for sleep locks as an SMP
    optimization. Linux appears to use priority inversion (Linus is this
    correct). Priority inheritence is a good feature for SMP scaling. They
    also implement a ticket scheme for sleep locks that are taken in a lock
    ordering model, so if you deadlock, they have very good mechanisms for
    detecting this. Something Linux could use ....

    Jeff

    "Jeff V. Merkey" wrote:
    >
    > They've got a lot of very good apps (about 40,000+) that run on this
    > platform. The Applications they host are the best thing Uniware brings
    > to the party. Most of them will port to Linux without a lot of fus.
    > TUX was the best thing they had, but isn't this already on Linux?
    >
    > Some of the NetWare pieces (they have a better server than MARS-NWE)
    > would move over nicely. Their kernel, as you probably know, is slot
    > based and is different from Linux, but Linux is smaller, cleaner, more
    > intuitive, and easier to work on.
    >
    > :-)
    >
    > Jeff
    >
    > Tigran Aivazian wrote:
    > >
    > > On Wed, 23 Aug 2000, Jeff V. Merkey wrote:
    > > > Just remember, Caldera is a LINUX company -- they will take the
    > > > best of both, and use it to improve Linux ....
    > > >
    > > > :-)
    > >
    > > Hi Jeff,
    > >
    > > Good stuff, but what I am still wondering is whethere is indeed anything
    > > in UnixWare (or any other commercial UNIX) that can be used to improve
    > > Linux. Pray do tell us, what do you think such areas might be?
    > >
    > > At the moment, I can't think of any, and I did work as a UnixWare7 kernel
    > > escalations engineer for 2 years :)
    > >
    > > Regards,
    > > Tigran
    -
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