Seeking performance tuning pointers/tracking down GIANT

[Lucky Green]

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I read man tuning and did some goggling. Yet questions remain.

System:
Dual processor Intel PentiumPro motherboard. FreeBSD 5.3 SMP kernel. fxp
100baseT NIC.

I am managing a system that is running tor, a fairly network intensive
service. See http://tor.eff.org
The service processes about 7Mbps symmetric traffic sustained. "top" shows
about 33% CPU idle. There is plenty of inactive/free RAM. While server
throughput grew steadily over time, throughput appears to have hit a ceiling
at between 7 and 8 Mbps. The bottleneck is not upstream from the server. I
am trying to track down the bottleneck inside the server that is
establishing this ceiling. I played around with various sysctl variables,
but to no effect. One thing that I do notice is that the main tor process
tends to spend a fair amount of time in GIANT.

Does perhaps one of the readers of this list have any suggestions how to
determine where the bottleneck may be found and if so how to remove it?

Thanks,
- --Luck

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