157k interrupts per second causing 60% CPU load on idle system

[Ronald Klop]

On Sat, 14 Apr 2012 01:13:30 +0200, Matt Thyer <matt.thyer at gmail.com>  
wrote:

> On Apr 7, 2012 2:38 PM, "Matt Thyer" <matt.thyer at gmail.com> wrote:
>>
>> On 7 April 2012 14:31, Matt Thyer <matt.thyer at gmail.com> wrote:
>>> Since moving the SATA 3 disk to the onboard Intel SATA 2 controller I'm
> no longer having that disk evicted from the raidz2 pool with write errors
> and I thought that the high interrupt rate issue had also been solved but
> it's back again.
>>>
>>> This is on 8-STABLE at revision 230921 (before the new driver hit
> 8-STABLE).
>>>
>>> So now I need to go back to trying to determine what the cause is.
>>>
>> vmstat -i has shown that the issue was on irq 16.
>>
>> Unfortunately there seems to be a lot of things on irq 16:
>>
>> $  dmesg | grep "irq 16"
>>
>> pcib1: <PCI-PCI bridge> irq 16 at device 1.0 on pci0
>> mps0: <LSI SAS2008> port 0xee00-0xeeff mem
> 0xfbdfc000-0xfbdfffff,0xfbd80000-0xfbdbffff irq 16 at device 0.0 on pci1
>> vgapci0: <VGA-compatible display> port 0xff00-0xff07 mem
> 0xfb400000-0xfb7fffff,0xe0000000-0xefffffff irq 16 at device 2.0 on pci0
>> uhci0: <UHCI (generic) USB controller> port 0xfe00-0xfe1f irq 16 at
> device 26.0 on pci0
>> pcib2: <ACPI PCI-PCI bridge> irq 16 at device 28.0 on pci0
>> pcib3: <ACPI PCI-PCI bridge> irq 16 at device 28.4 on pci0
>> atapci0: <JMicron JMB368 UDMA133 controller> port
> 0xdf00-0xdf07,0xde00-0xde03,0xdd00-0xdd07,0xdc00-0xdc03,0xdb00-0xdb0f irq
> 16 at device 0.0 on pci3
>>
>> Any idea how to isolate which bit of hardware could be triggering the
> interrupts ?
>>
>> Unfortunately the only device I could remove would be the SuperMicro
> AOC-USAS2-L8i (so yes I could eliminate that).
>>
>> My biggest problem right now is not knowing how to trigger the issue.
>>
>> At this stage I'm going to upgrade to 9-STABLE and see if it returns.
>
> The problem does not occur with 9-STABLE.
>
> Who knows what the problem was ? USB maybe ?

Do you still have the same hardware on the same interrupts on 9-STABLE?
Are there changes in the use of MSI(-X)?