I'm fireing 400Kpps at a udp blackhole port. I'm getting 6000 interrupts per second on em3: testbox# vmstat -i; sleep 1; vmstat -i interrupt total rate irq1: atkbd0 1 0 irq6: fdc0 1 0 irq17: uhci1+ 2226 9 irq18: uhci2 ehci+ 9 0 cpu0: timer 470507 1993 irq256: em0 665 2 irq259: em3 1027684 4354 cpu1: timer 470272 1992 cpu3: timer 470273 1992 cpu2: timer 470273 1992 Total 2911911 12338 interrupt total rate irq1: atkbd0 1 0 irq6: fdc0 1 0 irq17: uhci1+ 2226 9 irq18: uhci2 ehci+ 9 0 cpu0: timer 472513 1993 irq256: em0 668 2 irq259: em3 1033703 4361 cpu1: timer 472278 1992 cpu3: timer 472279 1992 cpu2: timer 472279 1992 Total 2925957 12345 top -SH shows: PID STATE C TIME CPU COMMAND 10 CPU3 3 7:32 100.00% idle 10 CPU2 2 7:32 100.00% idle 10 RUN 0 7:31 100.00% idle 10 CPU1 1 7:31 100.00% idle This implies that CPU usage is substantially under-reported in general by the system. Note that I've modified em_irq_fast() to call em_handle_rxtx() directly rather than scheduling a task to illustrate the problem BarneyReceived on Thu Mar 12 2009 - 19:23:32 UTC
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