[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>

diff --git a/drivers/scsi/isci/host.c b/drivers/scsi/isci/host.c
index 9a52b984620f6f529d5614b94163bbf7c111c54a..670ecb456d4811b1fcf4fb372477b9e37ee0fe17 100644 (file)
--- 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 1047108ba4de3a21b97c8b1dceeafda36ff301f1..3c4ddad9705315944bfc0965b53f91c7b441766b 100644 (file)
--- 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)");