Pasi Kärkkäinen wrote:

I think SFP+ 10 Gbit has 0.6usec latency.. ? 10GBase-T is 2.6 usec.

They are reporting 7+ us latency. ConnectX are a bit better on latency than the Intel NICs.

shows latency, server to server of ~5us. This is about what you expect (and why 10GbE isn't quite to IB capability yet in low latency apps).

I suspect that they really aren't seeing ~1us latencies, but that with some neat tricks, it appears to be this.

Physically, it isn't there. I'd classify this as a "marketing number" (e.g. unachievable in applications that matter). I'd be happy to be proven wrong, but there really isn't much to suggest that I am wrong.

Joseph Landman, Ph.D
Founder and CEO
Scalable Informatics Inc.
web  :
phone: +1 734 786 8423 x121
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