Date: Thu, 12 Mar 2009 13:23:31 -0700 (PDT) From: Barney Cordoba <barney_cordoba@yahoo.com> To: current@freebsd.org Subject: Interrupt routine usage not shown by top in 8.0 Message-ID: <156527.19600.qm@web63901.mail.re1.yahoo.com>
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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
Barney
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