[Beowulf] using two separate networks for different data streams
lindahl at pathscale.com
Mon Jan 30 01:54:50 EST 2006
On Mon, Jan 30, 2006 at 01:18:22AM -0500, Mark Hahn wrote:
> hmm, I had the impression that InfiniPath operated in either fast
> InfiniPath-to-InfiniPath mode, or in slow generic IB mode. that is,
> that in "fast" mode, it was mostly just recycling IB phy layers.
Our fast mode is the moral equivalent to sending packets with unusual
ethertypes over Ethernet. That's still Ethernet; the standard allows
for such an extension. IB is similarly extensible.
The Cray XT3 is an example, I think, of a system which sends
non-IB-like packets over an IB physical layer. But I don't think the
details are public and I don't know much about the XT3.
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