Pasi Kärkkäinen wrote:
I think SFP+ 10 Gbit has 0.6usec latency.. ? 10GBase-T is 2.6 usec.
http://www.mellanox.com/pdf/whitepapers/wp_mellanox_en_Arista.pdf
They are reporting 7+ us latency. ConnectX are a bit better on latency
than the Intel NICs.
http://www.ednasia.com/article-24923-solarflarearistanetworkspublishtestreportdemonstratinglowlatencywith10gbe-Asia.html
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.
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