dean gaudet <[email protected]> writes:
> on AMD x86 pre-family 10h the boundary is 8 bytes, and on fam 10h it's 16
> bytes. the penalty is a mere 3 cycles if an access crosses the specified
> boundary.
Worth noting though, is that atomic accesses that cross cache lines on
an Opteron system is going to lock down the Hypertransport fabric for
you during the operation -- which is obviously not so nice.
--
Arne.
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