//   a. The current implementation only works on one (local) disk at a
//	time, as specified by MAJOR (0x74 for IDE and 0xd for SCSI) and
//	UNIT (0, 1, 2, .. depending on drive number). If unsure of this,
//	chdir to the experimental disk and do "df .". /dev/ad0xxx
//	corresponds to (0x74,0) and /dev/da3xxx to (0xd,3).

/* scheduler works only for one disk at a time, specified here: */
#define MAJOR	0x74	/* IDE:ad:0x74, SCSI:da:0xd */
#define UNIT	0x0	/* 0, 1, .. for ad0/da0, ad1/da1 */


//   b. Set the scheduling policy to one of:
//        * SPTF - shortest positioning-time first. has potential starvation.
//	* SPTF and ASPTF_BOUND=1000 - Aged-SPTF, which forces SPTF to
//	  switch to a request from some other process after 1000ms.
//	* CLOOK - same as CSCAN (i.e. bidirectional Elevator)
//
//	* STRIDE - pure (simplified) proportional-share scheduler
//	* STRIDE and SPTF and ASPTF_BOUND=1000 - proportional scheduler
//	  combined with seek reducing component.
//	* LOTTERY - a simplified lottery scheduler
//
//	Default scheduling policy is Aged-SPTF, you can start with that.
//
//	NOTE: some scheduling policies like Aged-SPTF and Stride are
//	rather simplified, but are sufficient to make the desired point.
//
//	If using Stride, there's a PROP_RELAX_THRESH in milliseconds
//	that specifies the slack period granted for seek reduction.
//
//	Also, the number of resource principals for proportional
//	schedulers is hardcoded here, and the proportions themselves are
//	fixed at 1:2:3:..:NRC. NRC *needs* to be correct; set it well.

/* Which seek reducing scheduler? */
#define SPTF
#define ASPTF_BOUND 1000 // define this bound (in ms) along with SPTF
/* #define CLOOK */
/* #define SSTF */

/* or which proportional scheduler? */
/* #define STRIDE */
/* #define YFQ */
/* #define LOTTERY */

#define PROP_RELAX_THRESH 100 // relaxed scheduler for seek reduction (ms)
#define NRC 2	// number of resource containers, and their shares, hardcoded


//   c. define NWCS to enable anticipatory scheduling; comment out to
//      disable. Default is enabled.

/* choose: original scheduler or non work conserving? */
#define NWCS


//   d. Choose between i8254 PIT and on-chip APIC. PIT should work fine.

/* which timer facility? */
#define PIT
/* #define APIC */


/* (skip) */

/* cause the full NWCS overhead, but always schedule immediately */
/* #define noNWCS */
/* cause only the timer overhead */
/* #define onlyTIMER */
/* #define DEBUG */
/* #define DI_CAM_DEBUG */
/* application-aware blockedness reporting */
/* #define APP_NOTIFYBLOCKED */


#define DECAY decay10
#define BUCKETDECAY 90

#define MAXTIME 15000 // us
#define TIMEGRAIN 500 // us

#define FROM 5 // sec -- measurement.start
#define TO 25  // sec -- measurement.end