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SubjectRe: Serious problem with ticket spinlocks on ia64
Date
On Friday 27 of August 2010 22:29:41 Luck, Tony wrote:
> > If this is a memory ordering problem (and that seems quite plausible)
> > then a liberal sprinkling of "ia64_mf()" calls throughout the spinlock
> > routines would probably make it go away.
>
> I think I take this back ... if it were a memory ordering problem, then
> it could show up any time - not just at wrap-around.

Well, I wasn't originally sure if it only happens at wrap-around. OTOH I've
now modified my tests, so that they would also catch any other badness, and I
still only got another two failures after wrap-around.

From looking at the traces, I'm afraid this smells like another Itanium
erratum. I'm now trying to write a minimal test case...

Petr Tesarik


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