On Mon, Dec 08, 2008 at 10:19:17AM -0500, Lawrence Stewart wrote: > Well <of course> the NIC should read from cache or update the cache if the > data happens to be there. Don't all well designed I/O systems do that?
There are a small number of systems that don't. Needless to say, it's a bit confusing for library writers to get I/O right in that circumstances. BTW, any interconnect that sends messages using PIO sends from cache. I wish people would invent a real receive-to-cache, since it would be nice overhead reducer for small messages on InfiniPath -- a small latency benefit (~ 7%), a bigger overhead benefit (~ 15%). -- greg _______________________________________________ Beowulf mailing list, [email protected] To change your subscription (digest mode or unsubscribe) visit http://www.beowulf.org/mailman/listinfo/beowulf
