Date: Fri, 11 Mar 2005 23:51:40 +0100 From: "Daniel Eriksson" <daniel_k_eriksson@telia.com> To: "'FreeBSD Current'" <freebsd-current@freebsd.org> Subject: Higher interrupt rate after recent SMP/APIC timer changes? Message-ID: <!~!UENERkVCMDkAAQACAAAAAAAAAAAAAAAAABgAAAAAAAAA0VcX9IoJqUaXPS8MjT1PdsKAAAAQAAAAeMYUhtckfk%2BR4a3yIBKgtAEAAAAA@telia.com>
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After the recent changes to the use of APIC timers on SMP systems, the reported interrupt rate has gone up significantly: # vmstat -i interrupt total rate irq1: atkbd0 3 0 irq0: clk 55294842 1998 irq4: sio0 656 0 irq6: fdc0 13 0 irq13: npx0 1 0 irq14: ata0 28299 1 irq15: ata1 28144 1 irq17: atapci1+ 60822 2 irq19: atapci3+ 19848 0 irq20: ciss0 857173 30 irq21: em0 1 0 irq22: em1 1 0 lapic1: timer 110665583 3998 lapic0: timer 110649350 3998 Total 277604736 10031 This is an SMP box (dual AMD AthlonMP) running with HZ=2000 and POLLING enabled. Should I worry about the 4k intr/sec reported for lapic0 and lapic1, or is this the way things should be? I should add that system load has not changed noticeably, leading me to believe that the lapic* interrupt rate is by design and nothing to worry about. (But I still wanted to ask.) /Daniel Eriksson
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