PS: As of number of packets sent thru computer:
50 packets per second * 400 channels * 2 in/out = 40 000 packets
per second.
Performance dies not because of system calls, but because 20 000
interruptions/sec happened at that moment.
It's named IRQ poisoning. Because IRQ switching is longer that
standard
task switching.
<snip/>
These IRQ storms are only happening on crappy network hardware. My
testing was one with intel gigabit NICs with large buffers,
effectively producing < 100 interrupts per second. kernel profiling
showed time was indeed spent in system calls
roy
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