[Beowulf] Intel CSA performance?

[Mark Hahn]

Intel added a special connection on their chipset to connect 
gigabit on some chipsets (CSA).  I've been wondering whether 
this would offer a latency advantage, since it's conventional wisdom
that PCI latency is a noticable part of MPI latency.

this article:
http://tinyurl.com/2vlez
claims that CSA actually hurts latency, which is a bit puzzling.
it is, admittedly, "gamepc.com", so perhaps they are unaware of 
tuning issues like interrupt-coalescing/mitigation.

do any of you have CSA-based networks and have done performance tests?

thanks, mark hahn.

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