Date: Tue, 29 Jan 2008 15:14:21 -0800 From: John Berliner <john@johnberliner.com> To: freebsd-questions@freebsd.org Subject: SMP kernel and interrupt storm Message-ID: <A11B51F8-66D7-483A-B6F7-3A0FB3301388@johnberliner.com>
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Building 6.3-RELEASE on dual Xeon boxes, SMP kernel builds fine, all
4 CPUs launch on reboot.
options SMP
device apic
But I get a TON of interrupts from acpi0 -- about 68,000 per second
according to vmstat -i. With system at idle with almost no services
running, here is output of top -S:
last pid: 1026; load averages: 0.94, 0.96, 0.91
63 processes: 6 running, 42 sleeping, 15 waiting
CPU states: 0.0% user, 0.0% nice, 0.0% system, 45.3% interrupt,
54.7% idle
Mem: 9296K Active, 13M Inact, 28M Wired, 16K Cache, 17M Buf, 3843M Free
Swap: 4096M Total, 4096M Free
PID USERNAME THR PRI NICE SIZE RES STATE C TIME WCPU
COMMAND
13 root 1 171 52 0K 8K RUN 0 42:54 99.02%
idle: cpu0
21 root 1 -52 -171 0K 8K CPU2 2 32:26 85.25%
irq9: acpi0
11 root 1 171 52 0K 8K RUN 2 10:33 12.74%
idle: cpu2
Notice high load (0.94, often higher) and 45% interrupt.
If turn off ACPI (set hint.apic.0.disabled=1 in loader.conf), the
interrupt 'storm' ceases, but then I'm only running on one CPU.
Help? -- John
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