Rick Jones wrote:
8KB socket buffers, 8KB writes to the socket or both?
8KB write to the socket with an 8KB read on the other end. TCP socket buffers at default. I'm using netperf now since the numbers were about the same and netperf has more options.
netperf -t TCP_STREAM -H <remote> -- -s 128K -S 128K -m 32K
Didn't help. I tried various buffer sizes and can't get over 60Mbit transmit from the machine with a 9000 MTU. I'll try to find out at what point between 8500 and 9000 the performance drops. I'll also swap the network cards around to rule them out.
I've used two other machines as the remote and the results are the same. Between those two remote machines there's no problem.
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