> Date: Fri, 17 Sep 2010 20:06:09 -0400 > From: "Abel Alejandro" <aalejan...@worldnetpr.com> > > 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.
You might look at http://fasterdata.es.net. A lot of it is aimed at very large volume data transfers, but quite a bit is relevant to all TCP issues. -- R. Kevin Oberman, Network Engineer Energy Sciences Network (ESnet) Ernest O. Lawrence Berkeley National Laboratory (Berkeley Lab) E-mail: ober...@es.net Phone: +1 510 486-8634 Key fingerprint:059B 2DDF 031C 9BA3 14A4 EADA 927D EBB3 987B 3751
