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


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 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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