[Beowulf] Intel buys QLogic InfiniBand business
hahn at mcmaster.ca
Fri Jan 27 13:07:08 PST 2012
> I found that statement interesting. I've actually not known anything
> about their 10GbE products. My bad.
I was a bit surprised that the entire transcript had only one
side-ways mention of IB. also interesting that they seem quite
heavily into the heavily-offloaded adapter market (which is sort
of the opposite of the original infinipath stuff.)
>>> I would guess that we will see message passing/RDMA over
>>> Thunderbolt or similar.
has there been any mention of Thunderbolt in a switched context?
afaikt it's just a weird "let's do faster USB and throw in video" thing.
> Intel buying makes quite a bit of sense IMO. They are in 10GbE silicon
> and NICs, and being in IB silicon and HCAs gives them not only a hedge
> (10GbE while growing rapidly, is not the only high performance network
weird to have redundant/competing parts in many of the same markets though.
afaik, intel 10G has a reasonable rep; they presumably won't be junking
their own products.
> ...). Its quite likely that Intel would need IB for its PetaScale
I can't quite tell whether Qlogic's IB switches use Mellanox chips or not.
afaik, Qlogic has their own adapter chips (and perhaps FC/eth).
> than 30%) better than QDR? I've been hearing numbers like 0.8-0.9 us
> for a while, and switches are still ~150-300ns port to port. At some
mellanox qdr systems I've tested are about 1.6 us half-rtt pingpong.
I don't think the switch latency is a big deal, since with 36x fanout,
you don't need a very tall fat-tree.
> Curiously, I think this suggests that ScaleMP could be in play on the
> software side
really? I'd be interested in hearing from real people who've actually
used it (not marketing, thanks). I don't really understand how ScaleMP
can do the required coherency in units smaller than a page, which means
that "non-embarassing" programs will surely notice...
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