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Experimental Results

 

We ran our experiments on four Intel and Alpha hardware configurations:

All systems run kernels built from the same FreeBSD 4.0 source pool, which was current as of 4/15/99. The hosts are interconnected through diverse Myrinet switch models, which have no measurable effects on the results.

To take timings, we used netperf version 2.1pl3 built from the FreeBSD ports collection. We modified netperf to collect CPU utilization by reading the system timers directly from kernel memory via libkvm, in order to correctly charge interrupt overhead to the netperf process. All tests were run on isolated machines, and the vast majority of the interrupts serviced came from the gigabit NIC.



 
next up previous
Next: TCP Bandwidth Up: Trapeze/IP: TCP/IP at Near-Gigabit Previous: Checksum Offloading
Jeff Chase
8/4/1999