[netperf-talk] (fwd) Performance of USB3 gigabit-ethernet adaptors

[Rick Jones]

If someone happens to have one or more of these devices and the time
to run some TCP_RR through them I suspect Thomas Womack would be
greatful.  If I had such things to measure, I'd be inclined to use a
./configure --include-historgram configured netperf binary with
verbosity set to -2 and/or include all the _LATENCY omni output
selectors.

happy benchmarking,

rick jones

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From: Thomas Womack <twomack at chiark.greenend.org.uk>
Newsgroups: comp.arch
Subject: Performance of USB3 gigabit-ethernet adaptors
Date: 12 Dec 2012 22:18:47 +0000 (GMT)
Organization: Linux Unlimited
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Yes, these are obviously crazy objects and you would expect them to
have really horrible latency properties.

But www.montblanc-project.eu intends to build a non-trivial
supercomputer out of Exynos 5250 chips, and these chips exhibit two
high-speed interfaces, namely USB3 and SATA3.  Networking over SATA3
seems likely to be painful, whereas there is a commercial USB3-GbE
chip, the ASIX AX88179, which is built into dongles by a few
manufacturers.

So I would be interested to hear actual latency benchmarks, ideally
between two machines going X - USB3 - GbE - USB3 - Y but 
X - USB3 - GbE - real switch - GbE - PCIe - Y would also be fine.

I don't have any machine new enough to speak USB3, and the reviews of
USB3 ethernet dongles on the Web are by people who can just barely
spell 'bandwidth'.

Tom
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-- 
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these opinions are mine, all mine; HP might not want them anyway... :)
feel free to post, OR email to rick.jones2 in hp.com but NOT BOTH...