Date: Thu, 31 Jan 2008 10:48:28 -0800 From: Nate Lawson <nate@root.org> To: Tech Lab Manager <tech@liveoaksf.org> Cc: freebsd-acpi@freebsd.org Subject: Re: SMP, ACPI and interrupt storm Message-ID: <47A217FC.1080606@root.org> In-Reply-To: <429F40B0-20EE-4F47-847A-A6B1E91BA79F@liveoaksf.org> References: <429F40B0-20EE-4F47-847A-A6B1E91BA79F@liveoaksf.org>
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Tech Lab Manager wrote: > 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. That doesn't turn off acpi, that turns of the APIC (interrupt controller). Try: hint.acpi.0.disabled=1 > The BIOS ACPI settings are all Enabled. Hyperthreading is Enabled. > These machines have been running RedHat Enterprise 5.0 with full > multiprocessor support. This looks like a failure to sleep in C1 (hlt). Someone else reported this probably earlier, but all debugging showed the inexplicable -- the HLT instruction was being executed but just did not work (returned immediately). There will be a new 7.0 build that fixes one interrupt storm related to level-triggered GPEs. If you can cvsup your 7.0 branch (RELENG_7_0) and retry, that might be helpful to see if it also fixes your problem. -- Nate
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