[PATCH 0/1] [Hardy SRU] LP#249964: AACRAID driver stalls under high load

[Tim Gardner]

Andy Whitcroft wrote:
> We have had reports of driver stalls on AACRAID drivers under high load.  This
> seems to be related to the ammount of concurrent IO that can be pushed
> to the controller.  Reducing the maximum queue count for this driver sorts
> this out.  For further details see the upstream and Ubuntu bugs:
> 
>     http://bugzilla.kernel.org/show_bug.cgi?id=11120
>     http://bugs.launchpad.net/bugs/249964
> 
> Following this email is a patch from Mathias Urlichs to reduce the
> queue size.  This has been tested and confirmed to fix the issue by a
> couple of those affected.
> 
> I have pushed this same patch up to the driver maintainers for their
> consideration.  Proposing for SRU to hardy.
> 
> -apw
> 
> Mathias Urlichs (1):
>   UBUNTU: SAUCE: Reduce AACRAID hardware queue size
> 
>  drivers/scsi/aacraid/aacraid.h |    2 +-
>  1 files changed, 1 insertions(+), 1 deletions(-)
> 

ACK. Its curious that the adapter firmware doesn't have a known resource
limit. After all, the driver was written by Adaptec.

-- 
Tim Gardner tim.gardner at canonical.com