[SCSI] isci: performance-fix, shorten default "no outbound task" timeout

"No task timeout timer reduced from 20 to 2 This timer controls how
long the SCU hardware will hold open the TX side of the connection
before sending a DONE.  The timer allows the hardware to attempt to
optimize the DONE/CLOSE behavior to allow for new COMMAND IU to be
posted.  In practice closing the connection quicker is better."

Signed-off-by: Marcin Tomczak <marcin.tomczak@intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>

2 files changed, 2 insertions, 2 deletions

diff --git a/drivers/scsi/isci/host.c b/drivers/scsi/isci/host.c
index 9a52b984620f..670ecb456d48 100644
--- a/drivers/scsi/isci/host.c
+++ b/drivers/scsi/isci/host.c
@@ -1697,7 +1697,7 @@ static void sci_controller_set_default_config_parameters(struct isci_host *ihost
         ihost->user_parameters.ssp_inactivity_timeout = 5;
         ihost->user_parameters.stp_max_occupancy_timeout = 5;
         ihost->user_parameters.ssp_max_occupancy_timeout = 20;
-        ihost->user_parameters.no_outbound_task_timeout = 20;
+        ihost->user_parameters.no_outbound_task_timeout = 2;
 }
 
 static void controller_timeout(unsigned long data)
diff --git a/drivers/scsi/isci/init.c b/drivers/scsi/isci/init.c
index 1047108ba4de..3c4ddad97053 100644
--- a/drivers/scsi/isci/init.c
+++ b/drivers/scsi/isci/init.c
@@ -94,7 +94,7 @@ MODULE_DEVICE_TABLE(pci, isci_id_table);
 
 /* linux isci specific settings */
 
-unsigned char no_outbound_task_to = 20;
+unsigned char no_outbound_task_to = 2;
 module_param(no_outbound_task_to, byte, 0);
 MODULE_PARM_DESC(no_outbound_task_to, "No Outbound Task Timeout (1us incr)");