diff options
| author | jeff <jeff@FreeBSD.org> | 2003-10-16 08:17:43 +0000 |
|---|---|---|
| committer | jeff <jeff@FreeBSD.org> | 2003-10-16 08:17:43 +0000 |
| commit | bf29a9dd12c09202074e962807f15097f0ae53e3 (patch) | |
| tree | 15ab3e56472a0666dc8187030124ca6e4a184824 /sys/kern/sched_ule.c | |
| parent | d00fd6c26e785df586d947bab4a97345e476858a (diff) | |
| download | FreeBSD-src-bf29a9dd12c09202074e962807f15097f0ae53e3.zip FreeBSD-src-bf29a9dd12c09202074e962807f15097f0ae53e3.tar.gz | |
- The non iterative algorithm for interact_update was broken due to
rounding errors. This was the source of the majority of the
interactivity problems. Reintroduce the old algorithm and its XXX.
- Up the interactivity threshold to 30. It really could stand to be even
a tiny bit higher.
- Let the sleep and run time accumulate up to 5 seconds of history rather
than two. This helps stop XFree86 from becoming non-interactive during
bursts of activity.
Diffstat (limited to 'sys/kern/sched_ule.c')
| -rw-r--r-- | sys/kern/sched_ule.c | 14 |
1 files changed, 6 insertions, 8 deletions
diff --git a/sys/kern/sched_ule.c b/sys/kern/sched_ule.c index c0e2044..1f6a4d0 100644 --- a/sys/kern/sched_ule.c +++ b/sys/kern/sched_ule.c @@ -150,11 +150,11 @@ struct td_sched *thread0_sched = &td_sched; * INTERACT_MAX: Maximum interactivity value. Smaller is better. * INTERACT_THRESH: Threshhold for placement on the current runq. */ -#define SCHED_SLP_RUN_MAX ((hz * 2) << 10) +#define SCHED_SLP_RUN_MAX ((hz * 5) << 10) #define SCHED_SLP_RUN_THROTTLE (100) #define SCHED_INTERACT_MAX (100) #define SCHED_INTERACT_HALF (SCHED_INTERACT_MAX / 2) -#define SCHED_INTERACT_THRESH (20) +#define SCHED_INTERACT_THRESH (30) /* * These parameters and macros determine the size of the time slice that is @@ -674,12 +674,10 @@ sched_slice(struct kse *ke) static void sched_interact_update(struct ksegrp *kg) { - int ratio; - if ((kg->kg_runtime + kg->kg_slptime) > SCHED_SLP_RUN_MAX) { - ratio = (SCHED_SLP_RUN_MAX / - (kg->kg_runtime + kg->kg_slptime)) * 4; - kg->kg_runtime = (kg->kg_runtime * ratio) / 5; - kg->kg_slptime = (kg->kg_slptime * ratio) / 5; + /* XXX Fixme, use a linear algorithm and not a while loop. */ + while ((kg->kg_runtime + kg->kg_slptime) > SCHED_SLP_RUN_MAX) { + kg->kg_runtime = (kg->kg_runtime / 5) * 4; + kg->kg_slptime = (kg->kg_slptime / 5) * 4; } } |
