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

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"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>
This commit is contained in:
Marcin Tomczak 2012-01-04 01:32:54 -08:00 committed by James Bottomley
parent 9fee607f0b
commit 6024d38b86
2 changed files with 2 additions and 2 deletions
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2
drivers/scsi/isci/host.c
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@ -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)

2
drivers/scsi/isci/init.c
View File

@ -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)");