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Postscript: 100 Mbps Ethernet Performance Tests

Since a few alert readers complained that I did not use real 100 Mbps throughput test results in the throughput vs. path loss comparison plots, here is the data.

I ran a few quick IxChariot tests using two machines running Win XP SP2. One is a 2.4GHz P4, the other an Athlon 3000+. Both have Intel PRO/1000 MT gigabit desktop adapters, plugged into 100 Mbps switch ports which autonegotiated 100 Mbps full-duplex connections.

100 Mbps Ethernet - Transmit
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Figure 7: 100 Mbps Ethernet - Transmit

If the 100 Mbps line in Figures 1-4 bugs you that much, just subtract 7 Mbps. The story and my position on the subject don't materially change.

100 Mbps Ethernet - Receive
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Figure 8: 100 Mbps Ethernet - Receive

And for the sake of completeness, Figure 9 shows test results with simultaneous receive and transmit tests run. The Windows Task Manager Networking tab showed 100% network utilization, but the Performance tab showed CPU Usage in the 20s.

100 Mbps Ethernet - Simultaneous Xmit & Rcv
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Figure 9: 100 Mbps Ethernet - Simultaneous Xmit & Rcv

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