Is it possible to saturate 100Mbit ethernet using FreeBSD 4.9-STABLE,
Pentium-133 & Intel 430VX-based motherboard (PCI-33),
Intel 82559 Pro/100 Ethernet (fxp) ?
I tried to use sendfile(2) on /dev/zero but that does not work. Then I created 8Tb holey file and used sendfile() on it. That gave 100% CPU load and only 37Mbit/s on wire.
I usually use ttcp for tcp throughput measurement. You may not be able to do 100Mbps, due to tcp-ness, but it has a udp mode as well. Depends on what you are interested in doing. But ttcp is pretty low impact. Also, when you use it, boost the buffersize; this can help performance (and lower cpu hit) considerably.
I am doing 800+Mbps on gigE with FreeBSD 5.1 these days. The other trick we use for link utilization with tcp is to multiplex several sessions; we do a few score (or a few hundred :-) simultaneous ttcp's just with a shell script and background the processes.
ping -f with larger packets can also be useful.
--ckg
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