Re: should ia64_spinlock_contention do backoff?

On 25 Mar, David Mosberger wrote:
> Has anyone studied the impact of doing exponential backoff in
> ia64_spinlock_contention.  My theory is that it wouldn't buy much _if_
> spinlocks always were in their own cachelines, but since they're not,
> not using backoff could cause extra cache-line bouncing.  To be
> honest, I'd rather not spend time on this myself, since I don't have
> convenient access to large machines, but me thinks this is a question
> that's long overdue to have a proper answer.

We have 4-way Itanium2 systems here.  Is that large enough for testing?

Mark
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