Asus P5W DH Deluxe APIC/SMP IRQ problem

Nate Lawson nate at
Mon Jul 9 21:29:39 UTC 2007

John Baldwin wrote:
> On Friday 06 July 2007 06:01:43 am Михаил Кучин wrote:
>> Hi people!
>> Sorry for my bad english. Writing for the first time. I am searching help
>> =)
>> My OS:
>>    FreeBSD 6.2-RELEASE
>> Hardware:
>>   Asus P5W DH Deluxe MB (ICH7 Chipset)
>>   Intel Core 2 Duo CPU (6700)
>>   Integrated Netw Card (Marvell Yukon 88E8053 based Ethernet Controller)
>>   S3 Trio PCI Video Card (very-very old)
>> Problem:
>>   40% of CPU is occupied by interrupts, in some cases (I tried many
>>   ways of solving), I have "Interrupt storm detected" message.
>>   atapci2 (see vmstat), as I understand, occupies CPU. Here is my RAID1 
> controller with
>>   400G Samsung Disks and other ICH7 stuff.
>>   I tried to change in BIOS everything, disable everything, re-plug vga
>>   card, unplug some RAM. BIOS is fresh: a week ago release. Tried 3
>>   different versions.
> Try turning off various device drivers (like myk) to see if you can get the 
> interrupt storm on IRQ 23 to go away.  It is likely a bug in interrupt 
> routing in your BIOS, but you can use a tunable to work around it, you just 
> need to figure out which _other_ PCI device (not atapci2) is sending its 
> interrupts to IRQ 23 rather than the IRQ the BIOS told the OS.

I've noticed it's hard to find all the devices on a given irq with
vmstat -i, especially if a lot are sharing one.  I guess dmesg | grep
"irq 23" is the only way?


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