MFC of "Large set of CAM improvements" breaks I/O to Adaptec 29160 SCSI controller

[Robert Noland]

Scott Long wrote:
> On Apr 29, 2010, at 2:50 AM, Pete French wrote:
> 
>>> Thanks. First step successful - I can steadily reproduce problem on
>>> CURRENT. raidtest with 200 I/O streams over gmirror of two disks on same
>>> channel triggers issue in seconds. Any I/O on channel dying after both
>>> disks report "Queue full" error same time. The rest of system works
>>> fine. If I preliminarily manually adjust queue depth of one disk -
>>> everything works fine. I'll investigate it tomorrow.
>> Glad you have managed to dupliate it - the queue depth thing is
>> inetersting, what changes did you make ? I can try them here and see
>> if they improve the situation on either of my two machines.
>>
> 
> For the record, queue-full is a common, expected condition in CAM.  It's not something that should be avoided =-)

Should we maybe have a counter in sysctl rather than flooding the 
console with these messages then?

robert.

> Scott
> 
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