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Annotation of 41BSD/sys/h/vmtune.h, revision 1.1.1.1

1.1       root        1: /*     vmtune.h        4.1     11/9/80 */
                      2: 
                      3: /*
                      4:  * Tunable performance parameters
                      5:  *
                      6:  * These may vary per-cpu due to configuration as well as the flavor of
                      7:  * the local job mix.  MAXPGIO in multiplied by the number of swap devices
                      8:  * available (nswdev) at boot time.
                      9:  */
                     10: #define        LOOPSIZ         ((maxfree - firstfree) / CLSIZE)
                     11:                                        /* loop circumference */
                     12: #define        LOTSFREE        ((maxfree - firstfree) / 4)
                     13:                                        /* very high mark to freeze scans */
                     14: #define        DESFREE         200             /* minimum desirable free memory */
                     15: #define        MINFREE         64              /* water mark to run swap daemon */
                     16: #define        MAXSLP          20              /* max blocked time (in seconds) allowed
                     17:                                           before being very swappable */
                     18: #define        SLOWSCAN        25              /* seconds per loop when memory easy */
                     19: #define        FASTSCAN        15              /* seconds per loop when memory tight */
                     20: #define        SAFERSS         32              /* nominal ``small'' resident set size
                     21:                                           protected against replacement */
                     22: #define        MAXPGIO         50              /* max desired paging i/o per second
                     23:                                           per paging device, controls max
                     24:                                           paging ops per second */
                     25: /* WITH MAXPGIO SET TO 50, IT RARELY TAKES OVER */

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