I'm getting what I consider to be sub-par performance under FreeBSD 5.3 from a userland program using ngsockets connected into ng_tee to play with packets that are traversing a ng_bridge, and I finally have an opportunity to look into this. I say "sub-par" because when we've tested this configuration using three 2.8GHz Xeon machines with Gigabit Ethernet interfaces at 1000Mbps full-duplex, we obtained peak performance of a single TCP stream of about 12MB/sec through the bridging machine as measured by NetPIPE and netperf.
I'm wondering if bumping the recvspace should help, if changing the ngsocket hook to queue incoming data should help, if it would be best to replace ngsocket with a memory-mapped interface, or if anyone has any other ideas that would help performance.
Thanks in advance for any advice, Guy Helmer
-- Guy Helmer, Ph.D. Principal System Architect Palisade Systems, Inc.
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