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

[Matt Thyer]

On 5 April 2012 01:18, Freddie Cash <fjwcash at gmail.com> wrote:

> On Wed, Apr 4, 2012 at 5:19 AM, Matt Thyer <matt.thyer at gmail.com> wrote:
> > So it seems that both the old and new mps driver have a problem with the
> > Western Digital WD20EARX SATA 3 drive on a SuperMicro AOC-USAS2-L8i (SAS
> > 6G) controller (flashed with -IT firmware).
>
> I wouldn't say the driver has a problem with that specific drive.
> More that it might have a problem with a mixed SATA2/SATA3 setup.
>
> Sorry, that's what I meant to say but it now seems that the 157K
interrupts per second is probably not due to the SuperMicro AOC-USAS2-L8i.

Since moving the SATA 3 disk to the onboard Intel SATA 2 controller I'm no
longer having that disk evicted from the raidz2 pool with write errors and
I thought that the high interrupt rate issue had also been solved but it's
back again.

This is on 8-STABLE at revision 230921 (before the new driver hit 8-STABLE).

So now I need to go back to trying to determine what the cause is.

I'll stop posting in this thread as I don't think it's anything to do with
either the old or new version of this driver.