The one setting that I do suggest you keep is:
kern.ipc.somaxconn=512 (128 may be too low for http testing)
In our experience with Apache and clients that do not use Keep Alive (are short lived), 512 is also very low. It causes listen queue overflows and leads to a very low throughput.
Another place that we had to look at was the IP sw interrupt queue length.
# IP sw interrupt queue len, default 50; # check queue drops stats in net.inet.ip.intr_queue_drops net.inet.ip.intr_queue_maxlen=1000
Hope this helps
Aniruddha
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