Hi David,
Could this be an issue with pause frames? At a previous job I remember
having issues with a similar configuration using two broadcom sb1250 3
gigE port devices. If I ran bidirectional tests on a single pair of
ports connected via cross over, it was slower than when I gave each
direction its own pair of ports. The problem turned out to be that
pause frame generation and handling was not configured correctly.
We had PAUSE frames turned off for our testing. The idea is to let TCP
do the flow and congestion control.
The problem with PAUSE+TCP is that it can cause head-of-line blocking,
where a single oversubscribed output port on a switch can PAUSE a large
number of flows on other paths.
Cheers,
Bruce
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