On Thu, 13 Aug 2009, Tom Uffner wrote:

i'm hoping a few people will give me estimates on what kind of throughput i should theoretically expect before i provide any actual test data.

also, any suggestions on tuning would be welcome.

so far in preliminary tests, enabling polling on the network interfaces
reduces my performance slightly both to/from and through the box.
net.inet.ip.fastforwarding doesn't seem to make much difference either
way but i haven't done very thorough testing of it. increasing
net.inet.tcp.sendbuf_max & recvbuf_max may have helped, but again, not
sufficiently tested.

I can't speak to absolute numbers, but I wouldn't expect net.inet.tcp.* changes to make any difference, as they should affect only locally terminated sockets on the firewall host, not forwarded packets.

You might want to try experimenting with net.isr.direct -- try setting it to 0, as this changes the kernel dispatch model for the network stack. On a UP box, I would probably anticipate a performance loss for making that change, or similar configuration changes for multiple netisr threads using net.isr.maxthreads.

If you're using firewall code, fast forwarding is unlikely to make a difference. Depending on the cache/memory/CPU trade-off, you might find turning off flowtable support helps -- net.inet.flowtable.enable=0.

Robert N M Watson
Computer Laboratory
University of Cambridge
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