[Beowulf] specific motherboard???

[Mark Hahn]

> DX38BT have a 82566DC Gigabit controller, that isn't capable of jumbo frames
> (frame size is limited to 1500 bytes).
> But S3200SH have a 82566 controller too and a  82541PI that support jumbo
> frames up to 16kb (probably your switch will support frames up to 10kb).

do you have any data showing that jumbo frames will make a significant
difference?  yes, they will reduce interrupt-handling overhead (and perhaps
other overheads), but those tend to be fairly minor concerns on modern,
obscenely-fast cores...