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

[Ivan Voras]

On 20 March 2012 12:52, Matt Thyer <matt.thyer at gmail.com> wrote:
> On 20 March 2012 21:12, Ivan Voras <ivoras at freebsd.org> wrote:
>>
>> On 20/03/2012 06:26, Matt Thyer wrote:
>> > I've upgraded my FreeBSD-STABLE NAS from r225723 (22nd Sept 2011) to
>> > r232477 (4th Mar 2012) and am finding that a system process called
>> > "intr"
>> > is now constantly using about 60% of 1 CPU starting a short time after
>> > reboot (possibly triggered by use of the samba server).
>> >
>> > When this starts, systat -vm 1 says that the system is 85% idle and 14%
>> > interrupt handling.
>> > It says that there's around 157k interrupts per second.
>> >
>>
>> Ok, but *which* interrupt is getting triggered? Please send the output
>> of "vmstat -i".
>>
>>
> interrupt                          total       rate
> irq16: uhci0+                 3392184862     126692

Ok, something's probably wrong with USB. Can you disable it in BIOS?


> cpu0: timer                     53549677       1999
> irq256: mps0                     2643187         98
> irq257: re0                      5508108        205
> irq258: ahci0                     160717          6
> cpu1: timer                     53525300       1999
> cpu2: timer                     53525300       1999
> cpu3: timer                     53525296       1999
> Total                         3614622447     134999
>