I am measuring the performance of one TCP connection over two symmetric
paths. Packets are sent to two paths
alternatively. I found that when the latency of each path are within 1ms, the overall TCP
throughput is the *sum* of the
throughput of the two paths. However, when the latency of the two
paths increases to 5ms, the overal TCP throughput drops to the throughput of
a *single* path. Has anyone studied similar problem? What
makes the performance go down?
I use Fedora Core 3
and 4, teql and netem for my emulation.
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