[129772] in North American Network Operators' Group
Re: Troubleshooting TCP performance tutorial
daemon@ATHENA.MIT.EDU (Michael Painter)
Sat Sep 18 17:42:43 2010
From: "Michael Painter" <tvhawaii@shaka.com>
To: "Abel Alejandro" <aalejandro@worldnetpr.com>,
<nanog@nanog.org>
Date: Sat, 18 Sep 2010 11:42:30 -1000
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
Abel Alejandro wrote:
> Greetings,
>
> This past week I have been trying to find the root cause of tcp
> performance problems of a few clients that are using a third party metro
> Ethernet for transport. RFC2544 tests (Layer 2) and iperf using UDP give
> good symmetric performance almost 100% the speed of the circuit. However
> all kind of TCP tests result in some kind of asymmetrical deficiency,
> either the upstream or downstream of the client is hugely different. The
> latency is not a huge factor since all the metro Ethernet connections
> have less than 2 ms.
>
> So the question basically if is there a good tutorial or white paper for
> troubleshooting tcp with emphasis of using tools like Wireshark to debug
> and track this kind of problems.
>
> Regards,
> Abel.
It might be worth your while to run the analysis found here:
http://netalyzr.icsi.berkeley.edu/index.html
