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Subject: Re: [OMPI users] Slightly off topic: Ethernet and InfiniBand speed evolution
From: Peter Kjellstrom (cap_at_[hidden])
Date: 2009-05-07 04:23:21


On Thursday 07 May 2009, neeraj_at_[hidden] wrote:
> Thanks Pasha for sharing IB Roadmaps with us. But i am more interested in
> to find out latency figures since they often matter more than bit rate.
>
> Could there be rough if not accurate the latency figures being targeted in
> IB World?

The (low level verbs) latency has AFAIR changed only a few times:

1) started at 5-6us with PCI-X Infinihost3
2) dropped to 3-4us with PCI-express Infinihost3
3) dropped to ~1us with PCI-express ConnectX

Disclaimer: rough figures and only for Mellanox chips.

/Peter

> Regards
>
> Neeraj Chourasia