Hi!
> >>You can't tell that CPUs behave exactly
> >>probabilistically --- it may
> >>happen that one gets out of the wait loop always too
> >>late.
> >
> >Well, I don't need them to be _exactly_
> >probabilistical.
> >
> >Anyway, if you have 2048 CPUs... you can perhaps get
> >some non-broken
> >ones.
>
> No intel document guarantees you that if more CPUs
> simultaneously execute locked cmpxchg in a loop that a
If we are talking 2048 cpus, we are talking ia64.
> CPU will see compare success in a finite time. In fact,
> CPUs can't guarantee this at all, because they don't
> know that they're executing a spinlock --- for them its
> just an instruction stream like anything else.
...even i386 has monitor/mwait these days.
Pavel
--
Thanks for all the (sleeping) penguins.
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