[SCSI] isci: performance-fix, shorten default "no outbound task" timeout (6024d38b) · Commits · 戴 / test

"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>

drivers/scsi/isci/host.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -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)

drivers/scsi/isci/init.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -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)");

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