[PATCH 1/1] aacraid: add aacraid.cache parameter to driver to control FUA and SYNCHRONIZE_CACHE policy

["Salyzyn, Mark" <Mark_Salyzyn@xxxxxxxxxxx>]

aacraid.cache parameter, Disable Queue Flush commands:
        bit 0 - Disable FUA in WRITE SCSI commands
        bit 1 - Disable SYNCHRONIZE_CACHE SCSI command
        bit 2 - Disable only if Battery not protecting adapter supplied Cache

e.g.: aacraid.cache=7 will disable the FUA and SYNCHRONIZE_CACHE commands if the adapter has reported that it's cache is battery backed up.

This parameter permits experimentation with tradeoffs between performance and caching policy.

ObligatoryDisclaimer: Please accept my condolences regarding Outlook's handling of patch attachments.

Signed-off-by: Mark Salyzyn <aacraid@xxxxxxxxxxx>

 drivers/scsi/aacraid/aachba.c  |   36 ++++++++++++++++++++++++------------
 drivers/scsi/aacraid/aacraid.h |    2 ++
 drivers/scsi/aacraid/commsup.c |    4 ++++
 3 files changed, 30 insertions(+), 12 deletions(-)

Sincerely -- Mark Salyzyn

Attachment: aacraid_cache_parm.patch
Description: aacraid_cache_parm.patch