On Tue, 09 Mar 2010 23:29:04 +0100 Andres Meyer <andres.meyer@xxxxxxxxxxxx> wrote: > TCP test: slow > > dump at: http://cputoasters.com/ameyer/dumps/dump_twin_1s.bin If you use tcptrace to produce xplot graphs of sequence number, you get the attached result. The upper line is the sequence number of the upper bound of the window. It shows the window for the sender is open but is not being used. This means the send window is not configured large enough on the sender. With current Linux kernels, you should not have to configure socket send buffers in the application. It maybe that the application is using setsockopt to set send buffer space but not allowing for enough window.
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