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DSCHED(4)	      DragonFly Kernel Interfaces Manual	     DSCHED(4)


NAME

     dsched -- kernel disk scheduler framework


DESCRIPTION

     The dsched framework implements a disk scheduler framework that can be
     used to switch disk scheduling policies at runtime for each disk in the
     system.  The dsched framework and the policies for each disk can be man-
     aged via loader(8) tunables and via sysctl(8) variables.


LOADER TUNABLES

     Tunables can be set at the loader(8) prompt before booting the kernel or
     stored in loader.conf(5).

     dsched.policy.default  This tunable sets the default policy used for
			    every device that has no policy specified via any
			    of the other tunables.

     dsched.policy.da0	    This tunable sets the dsched policy for the disk
			    da0.  The default value is 0.

     dsched.policy.da	    This tunable sets the dsched policy for all disks
			    created by the driver da(4).


SYSCTL VARIABLES

     dsched.debug	    set the debug-level, 0 means no debugging, 5 for
			    maximum.

     dsched.policy.default  shows and sets the current default dsched policy.

     dsched.policy.da0	    shows and sets the current policy for the disk
			    da0.

     dsched.policy.SN39A39  shows and sets the current policy for the disk
			    with serial number SN39A39.

     The following are informative only:

     dsched.policies	    shows all available dsched policies, separated by
			    spaces.


SEE ALSO

     dsched_bfq(4), loader.conf(5), sysctl.conf(5), dsched(9)


HISTORY

     The dsched framework first appeared in DragonFly 2.5.


AUTHORS

     The dsched framework was written by Alex Hornung.

DragonFly 4.3			August 16, 2010 		 DragonFly 4.3

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