Jeff> Are you concerned about ordering, or write-combining?
ordering... write combining would be fine.
Jeff> I am unaware of a situation where writes are re-ordered into Jeff> a reversed, descending order for no apparent reason.
Hmm... I've seen ppc64 do some pretty freaky reordering but on the other hand that's a 64-bit arch so we don't care in this case. I guess I'd rather keep the barrier there so we don't have the possibility of a rare hardware crash when the HCA just happens to read the doorbell record in a corrupt state.
Well, we don't just add code to "hope and pray" for an event that nobody is sure can even occur...
Does someone have a concrete case where this could happen? ever?
Jeff
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