I've seen some posts mitigating this issue but there wasn't really a solution. So I start another conversation.
I have two servers (Win XP Prof) with 1000-SX adapters. I use iperf for measuring throughput.
When I connect the two servers (and only them) to a 3550-12G the throughput is about 300 MBit/s. When copying a file with windows explorer I get about 150 MBit/s.
When I connect them to a 6509 (same cables...) the throughput is about 500 MBit/s. When copying a file with windows explorer I get about 300 MBit/s.
I tried static vlans and "speed nonegotiate" on the 3550 but there was no improvement.
At least when I use parallel connections (5 or more) with iperf, the throughput is about 750 MBit/s on both switches. Copying more files simultaneously with windows explorer does not raise the throughput (still 150 / 300 MBit/s).
My question: what other tuning options can I use on the 3550? Or is the throughput for a one-to-one connection on this model just that bad?
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