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

[Tim Gardner]

Stefan Bader wrote:
> 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

We might want to think about this one. There is some discussion from
James Bottomley that the symptom might be firmware version related, so
all we're doing is fixing one case. He proposed an alternative solution
which did not involve a kernel change. Since Andy was on the email
thread, he ought to have the details.

rtg
-- 
Tim Gardner tim.gardner at canonical.com