[Beowulf] ethernet performance testing

Fred Youhanaie fly at anydata.co.uk
Fri Mar 17 08:44:01 PDT 2017


Brendan Gregg's web site is worth visiting:

	http://www.brendangregg.com/linuxperf.html

You may even be tempted to print out one or more of the diagrams and stick them on the wall ;-)

Cheers,
f.


On 17/03/17 14:33, Lux, Jim (337C) wrote:
> This is a bit of a blast from the past question.. Back when Beowulfs were the “new hot thing”, we all used Ethernet as the interconnect
> There was a bunch of traffic on the list about measuring Ethernet performance using various utilities, and all the ways to optimize the performance (zero copy Ethernet drivers and the like, some
> interfaces just being slow, etc.).
>
> What’s the current strategy and tools for looking at the Ethernet stack and identify?  I have a colleague who is working with a software radio peripheral (USRP) that streams samples out, and he’s
> getting better performance with USB3 than with GigE - it may be that this is just the way it works USB is dedicated master/client, while GigE is peer to peer.   So I suggested he do some back to back
> testing using a pair of PCs to know what the limit is.
>
> And he turned it around and asked “so what tools can I use?”
>
> iperf?
> netcat?
>
> I’ll dig through the archives too..
>
>
> James Lux, P.E.
>
> Task Manager, DHFR Space Testbed
>
> Jet Propulsion Laboratory
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> +1(818)354-2075
>
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>
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>
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