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Date: Mon, 21 Feb 2005 19:47:12 +0200
From: Dani Popa <dani@vipnet.ro>
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Subject: 46.3% interrupt
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Hi all,

i have install freebsd 5.3 stable on compaq p3 633 and i have some problems with it. I do nat for a network with 800 users with ipnat and i use device polling and my network interfaces are : fxp (intel)

kern.polling.burst: 24
kern.polling.each_burst: 50
kern.polling.burst_max: 150
kern.polling.idle_poll: 0
kern.polling.poll_in_trap: 1
kern.polling.user_frac: 50
kern.polling.reg_frac: 20
kern.polling.short_ticks: 0
kern.polling.lost_polls: 11093211
kern.polling.pending_polls: 0
kern.polling.residual_burst: 0
kern.polling.handlers: 3
kern.polling.enable: 1
kern.polling.phase: 0
kern.polling.suspect: 3964467
kern.polling.stalled: 0
kern.polling.idlepoll_sleeping: 1

in the same time i have a scsi controler on that machine and 1 hdd scsi

on vmstat -i :
interrupt                          total       rate
irq22: sym0                       793796          2
irq23: fxp0                            1          0
irq30: fxp1                            1          0
irq31: fxp2                            1          0
irq1: atkbd0                           4          0
irq6: fdc0                             8          0
irq8: rtc                       38518980        128
irq14: ata0                           31          0
irq15: ata1                            3          0
irq0: clk                      601377783       1998
Total                          640690608       2129

but on top :
CPU states: 25.3% user,  0.0% nice, 56.4% system, 46.3% interrupt,  0.0% idle

my question is: why 46.3% interrupt , i don't see with vmstat -i any device use interrupt so many