On Jul 9, 2007, at 3:17 PM, Peter Kjellstrom wrote:
> Our new HP cluster has 25208 HCAs (Mellanox Arbel) but a new vendor-
> id... We
> have 0x1708 (presumably HP, hardware wise Cisco (Mellanox)) to add
> to the
Added in r15316; thanks for pointing it out.
> existing list in share/openmpi/mca-btl-openib-hca-params.ini that
> # Mellanox 0x2c9
> # Cisco 0x5ad
> # Silverstorm 0x66a
> # Voltaire 0x8f1
> Somewhat related question 1: Is there a blessed way to map these
> ids back to
Not via C API, no. But the IEEE OUI web page can be used to look up
> question 2: Is 1024 really the best MTU for DDR Arbel? I seem to
> remember this
> being 2048...
I *believe* that that value came from Mellanox, but I don't remember
offhand. But it could also be a "doesn't really matter either way"
issue. You might want to try both with your apps and see if there's
a performance difference. Let us know what happens.