On Thu, Jan 28, 2010 at 01:44:00PM -0500, Joe Landman wrote:
> 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
>

This one is from 2008..

> 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).
>

Yeah.. well, I don't seem to be able to find better data :)

> 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.
>

I hope I get to test some 10 Gbit Ethernet equipment soon.. let's see 
what I can get myself.

-- Pasi

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