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

Also, to support this really cleanly, Linux will need to fully implement
the ENTIRE UI (Unix International) sync object standard. It does not
appear that Linux supports barrier sync objects, which their code does.

I will think about this more and see what else I can remember.

Jeff

"Jeff V. Merkey" wrote:
>
> 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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