Date: Wed, 30 Jan 2008 16:58:31 -0800 From: Tech Lab Manager <tech@liveoaksf.org> To: freebsd-acpi@freebsd.org Subject: SMP, ACPI and interrupt storm Message-ID: <429F40B0-20EE-4F47-847A-A6B1E91BA79F@liveoaksf.org>
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Hello, Sorry for the cross-post from freebsd-smb. Building 6.3-RELEASE and 7.0-RC1 on dual Xeon (4 CPU) boxes: options SMP device apic SMP kernel builds fine, all 4 CPUs launch on reboot. But I get a TON of interrupts from acpi0 -- about 67,000 per second according to vmstat -i. With system at idle and almost no services running, here is output of top -S: last pid: 877; load averages: 1.18, 0.48, 0.19 75 processes: 6 running, 54 sleeping, 15 waiting CPU states: 0.0% user, 0.0% nice, 0.2% system, 22.4% interrupt, 77.4% idle Mem: 31M Active, 12M Inact, 28M Wired, 16K Cache, 15M Buf, 3822M Free Swap: 4096M Total, 4096M Free PID USERNAME THR PRI NICE SIZE RES STATE C TIME WCPU COMMAND 10 root 1 171 52 0K 8K RUN 3 1:11 99.18% idle: cpu3 13 root 1 171 52 0K 8K CPU0 0 1:10 98.88% idle: cpu0 12 root 1 171 52 0K 8K CPU1 1 1:09 98.78% idle: cpu1 21 root 1 -52 -171 0K 8K CPU2 2 0:54 87.24% irq9: acpi0 11 root 1 171 52 0K 8K RUN 2 0:17 11.19% idle: cpu2 Notice high load and interrupt % of CPU. If turn off ACPI (e.g. set hint.apic.0.disabled=1 in /boot/loader.conf), the interrupt storm ceases, but then I'm only running on one CPU. The BIOS ACPI settings are all Enabled. Hyperthreading is Enabled. These machines have been running RedHat Enterprise 5.0 with full multiprocessor support. Any pointers? TIA. -- John Berliner Live Oak School http://www.liveoaksf.org
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