[Cerowrt-devel] trying to make sense of what switch vendors say wrt buffer bloat

[dpreed at reed.com]

Just today I found out that a datacenter my company's engineering group is expanding into is putting us on Arista 7050's. And our very preliminary tests of our systems there is showiung what seems to be a latency problem under load.  I can't get in the way of the deployment process, but it's interesting/worrying that "big buffers" are there in the middle of our system, which is highly latency sensitive.

I may also need a diagnostic test that would detect the  potential occurence of bufferbloat within a 10 GigE switch, now.  Our software layers are not prepared to self-diagnose at the ethernet layer very well.

My thought is to use an ethernet ping while our system is loaded.  (our protocol is at the Ethernet layer, no IP stack). Anyone have an idea of the simplest way to do that?

On Tuesday, June 7, 2016 1:51pm, "Eric Johansson" <esj at eggo.org> said:



 

On 6/6/2016 10:58 PM, [ dpreed at reed.com ]( mailto:dpreed at reed.com ) wrote:
Even better, it would be fun to get access to an Arista switch and some high performance TCP sources and sinks, and demonstrate extreme bufferbloat compared to a small-buffer switch.  Just a demo, not a simulation full of assumptions and guesses.
 I'm in the middle of a server room/company move.  I can make a available a  XSM4348S NETGEAR M4300-24X24F, and probably an arista 7050T-52 for a short time frame as part of my "testing".  tell me what you need for a test setup, give me a script I can run and where I should send the results.  I really need a cut and paste test because I have no time to think about anything more than the move.

 thanks.

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