[Beowulf] EM64T Clusters

Bill Broadley bill at cse.ucdavis.edu
Mon Jul 19 13:00:48 PDT 2004

On Fri, Jul 16, 2004 at 04:34:04PM -0400, Mark Hahn wrote:
> have a x16 PCI-e slot, which afaikt, would be a perfect place to put
> a low-latency cluster interconnect board.  I haven't heard Quadrics
> or Myri talking about their roadmap for PCI-e, but IB people seem to 
> think it'll give them the throne.  hard to see why, since it'll 
> help their competitors as well.  come to think of it, if IB people 
> claim PCI-e will shave over 1 us off their latency, what will PCI-e
> do for Quadrics (already under 2 us!)?

Myrinet at least for the current generation doesn't require more bandwidth
than PCI-x can give.  IB cards typically have 2 20 Gbit ports (10 Gbit each
direction).  So x8 or x16 slots make a much bigger difference with IB.

I suspect most if not everyone in the interconnect market has plans
for pci-e bandwidth.

Bill Broadley
Computational Science and Engineering
UC Davis

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