>>>>> "Chase" == Chase Venters <[email protected]> writes:
Chase> On Fri, 9 Jun 2006, Chris Friesen wrote:
>> Will this cause cacheline pingpong? If I do this sort of thing do
>> I need to ensure that the struct is a multiple of cacheline size
>> (or specify cacheline alignement)?
Chase> Yes. If CPU 2 tries to write to struct member 1 of array
Chase> element 2, and array element 1 is in CPU 1's cache, it must be
Chase> invalidated.
Chase> GCC (and kernel macros) provide good support for enforced
Chase> cacheline alignment, but it's also possible to pad your
Chase> structures.
Best way to go is to use __cacheline_aligned rather than try to get
the padding right manually. Someone will add a field somewhere in the
middle and mess it up and nobody notices.
Cheers,
Jes
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