Irq 19 / ATA interrupt storm

[Barney Cordoba]

--- On Tue, 7/28/09, Barney Cordoba <barney_cordoba at yahoo.com> wrote:

> From: Barney Cordoba <barney_cordoba at yahoo.com>
> Subject: Irq 19 / ATA interrupt storm
> To: current at freebsd.org
> Date: Tuesday, July 28, 2009, 5:47 AM
> 
> I'm been googling this problem and it seems to go back to
> early 6.x
> releases, and I've yet to find any intelligent answer to
> the problem. 
> I have the problem on an intel 5520 chipset (Tylersburg).
> Enabling the second SATA controller, which is required to
> use the SATA CD, causes the storm
> on interrupt 19. With USB enabled it appears under vmstat
> as a uhio
> interrupt; with USB disabled it appears as an atapci1
> interrupt. The CD shows up as the 3rd master.
> 
> Has anyone come up with a solution? It seems way too common
> to be ignored for so long.
> 
> Barney

Just for the sake of the archive, I corrected this problem by
porting back the latest sata definitions. It seems that if the
SATA is set up generically on the intel chipset the interrupt storm
is the result.

Barney