• Suganath Prabu S's avatar
    scsi: mpt3sas: Enable interrupt coalescing on high iops · 2426f209
    Suganath Prabu S authored
    Enable interrupt coalescing only on high iops queues.
    
    In ioc config page 1, offset 0x14 (ProductSpecific field) is used to
    determine interrupt coalescing enabled/disabled on per reply descriptor
    post queue group(8) basis.  If 31st bit is zero, then interrupt coalescing
    is enabled for all reply descriptor post queues. If 31st bit is set to one,
    then user can enable/disable interrupt coalescing on per reply descriptor
    post queue group(8) basis. So to enable interrupt coalescing only on first
    reply descriptor post queue group (i.e. on high iops queues), set bit 0 and
    31.
    
    This configuration should reset during driver unload or shutdown to the
    default settings. For this, the driver takes copy of default ioc page 1 and
    copies back the default or unmodified ioc page1 during unload and
    shutdown. This means that on next driver load (e.g. if older version driver
    is loaded by user), current modified changes on ioc page1 won't take
    effect.
    Signed-off-by: default avatarSuganath Prabu S <suganath-prabu.subramani@broadcom.com>
    Signed-off-by: default avatarMartin K. Petersen <martin.petersen@oracle.com>
    2426f209
mpt3sas_scsih.c 317 KB