interrupt storm on ahci

[Peter Grehan]

Hi Steve,

> I'm running a FreeBSD guest in bhyve on a FreeBSD host. Both are running
> FreeBSD CURRENT, r266947. I've gotten this message about 12 times since boot:
>
> interrupt storm detected on "irq268:"; throttling interrupt source
>
> vmstat -i shows:
>
> irq268: ahci1                  236514222        839
>
> ahci1 is the second disk connected to the system:
>
> ahci1: <Intel ICH8 AHCI SATA controller> mem 0xc0002400-0xc00027ff irq 18 at device 4.0 on pci0
>
> The VM itself runs poudriere and was building a bunch of packages. At the
> moment, the VM seems to be in a rather odd state. The poudriere jails are
> running, but not doing anything. Ideas?

  Is this an 8.* host ? I don't believe AHCI has MSI support on that 
version, and AHCI legacy interrupts haven't had a huge amount of testing 
under load.

  If it is 8.*, I'd recommend using virtio-blk for the block device 
until we can work out what's going wrong.

later,

Peter.