Interrupt storm detected on "irq16:"; throttling interrupt source - what to do?

[BlackArchon]

Here I have the following setup:

Intel Celeron G540, Asrock Z68 Pro3-M, 16 GB RAM, 4x WD Caviar Green 1TB (WD10EADS) connected to the motherboard's SATA AHCI ports (running as a raidz1 pool) and a 3ware Escalade 7506-4LP IDE-RAID-Controller with 4x Seagate Barracuda 320GB (also running as another raidz1 pool).

Yesterday I wrote some data on the last pool while also reading from it, and I got some of these errors:

interrupt storm detected on "irq16:"; throttling interrupt source

The 3ware RAID controller is on IRQ 16. This happens irregularly. What can I do to fix this behaviour? The write speed is also very unstable on this ZFS pool.

 

[cyberjock]

I don't have any good recommendations on how to help alleviate or identify the problem, but I'd try a different controller if possible.

 

[tingo]

Try

Code:

vmstat -i 

from a shell to see if there is anything else on irq16.
If it is, you can always try to move things around and see if that fixes it. Does your machine have more than one PCI slot? If so, you can try the 3ware controller in another slot.

 

[BlackArchon]

There is only the 3ware RAID controller on IRQ 16, and this is the only one PCI slot on this mainboard.

 

[jasonlitka]

Change hw.intr_storm_threshold.