"Interrupt storm"?!

Chuck Swiger cswiger at mac.com
Wed Feb 1 18:33:29 PST 2006

Garrett Cooper wrote:
[ ... ]
> Interrupt storm detected on "irq11: ahc0"; throttling interrupt source
> ahc0: PCI error Interrupt at seqaddr = 0x9
> ach0: Data Parity Error Detected during address or write data phase
>     Any ideas what this means?
>     ahc0 is the dev name for my adaptec scsi card. I also had some
> issues just a little earlier with RAM and the slot on the motherboard I
> was using (turns out the slot is bad and not the RAM), but this is sure
> a weird error.

Taking a look at "vmstat -i", and trying to avoid interrupt sharing with other
devices if possible might help.  (If you can, try turning off the USB controller
in your BIOS, since that commonly shares an IRQ with other devices.)

If you're seeing a RAM slot going bad, it's also quite possible that your
motherboard is simply corrupting data and needs to be replaced.  Check cooling,
check power supply...


More information about the freebsd-questions mailing list