diff options
| author | Adam Jackson <ajax@redhat.com> | 2013-11-05 10:20:04 -0500 |
|---|---|---|
| committer | Adam Jackson <ajax@redhat.com> | 2013-12-09 13:20:36 -0500 |
| commit | b61ccd5d9d368f3fbbae27ce14ac02a3db1884c4 (patch) | |
| tree | bb8137203a1951d959a699ae31dd5139ff3ad30b /dix/dispatch.c | |
| parent | 66310ea2893811614b3c3aade8992624a95a6ee7 (diff) | |
smartsched: Tweak the default scheduler intervals
A default timeslice of 20ms means a pathological client can ruin up to
two frames per scheduler tick. And a fifth of a second is just insane.
Pick two different numbers out of the hat. A 5ms slice means you can
probably keep up with two or three abusive clients, and letting it burst
to 15ms should give you about all the timeslice you need for a
fullscreen game (that's doing server-side rendering for some reason).
If you're running on a system with a 10ms granularity on SIGALRM, then
this effectively changes the intervals to 10ms and 30ms. Which is still
better, just not as better.
I suspect this is about as good as we can do without actually going
preemptive, which is an entire other nightmare.
Reviewed-by: Julien Cristau <jcristau@debian.org>
Signed-off-by: Adam Jackson <ajax@redhat.com>
Diffstat (limited to 'dix/dispatch.c')
| -rw-r--r-- | dix/dispatch.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/dix/dispatch.c b/dix/dispatch.c index 4fecfea7b..8dcd9cbcf 100644 --- a/dix/dispatch.c +++ b/dix/dispatch.c @@ -220,8 +220,9 @@ UpdateCurrentTimeIf(void) #undef SMART_DEBUG -#define SMART_SCHEDULE_DEFAULT_INTERVAL 20 /* ms */ -#define SMART_SCHEDULE_MAX_SLICE 200 /* ms */ +/* in milliseconds */ +#define SMART_SCHEDULE_DEFAULT_INTERVAL 5 +#define SMART_SCHEDULE_MAX_SLICE 15 #if defined(WIN32) && !defined(__CYGWIN__) Bool SmartScheduleDisable = TRUE; |