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Improve heuristic for VOSF profitability: we should not spend more than

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the half of a video interrupt quantum for updating the screen. Also improve
the wording of the result.
This commit is contained in:
gbeauche 2007-06-16 07:24:39 +00:00
parent 320b4ccd61
commit e3f9d46556
1 changed files with 7 additions and 9 deletions
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16
BasiliskII/src/Unix/video_vosf.h
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@ -218,12 +218,12 @@ static uint32 page_extend(uint32 size)
*/
const int VOSF_PROFITABLE_TRIES = 3; // Make 3 attempts for full screen update
const int VOSF_PROFITABLE_THRESHOLD = 16667; // 60 Hz
const int VOSF_PROFITABLE_THRESHOLD = 16667/2; // 60 Hz (half of the quantum)
static bool video_vosf_profitable(void)
{
int64 durations[VOSF_PROFITABLE_TRIES];
int mean_duration = 0;
uint32 duration = 0;
const uint32 n_page_faults = mainBuffer.pageCount * VOSF_PROFITABLE_TRIES;
#ifdef SHEEPSHAVER
const bool accel = PrefsFindBool("gfxaccel");
@ -240,9 +240,8 @@ static bool video_vosf_profitable(void)
else
addr[0] = 0; // Trigger Screen_fault_handler()
}
int64 duration = GetTicks_usec() - start;
mean_duration += duration;
durations[i] = duration;
uint64 elapsed = GetTicks_usec() - start;
duration += elapsed;
PFLAG_CLEAR_ALL;
mainBuffer.dirty = false;
@ -250,9 +249,8 @@ static bool video_vosf_profitable(void)
return false;
}
mean_duration /= VOSF_PROFITABLE_TRIES;
D(bug("Triggered %d screen faults in %ld usec on average\n", mainBuffer.pageCount, mean_duration));
return (mean_duration < (VOSF_PROFITABLE_THRESHOLD * (frame_skip ? frame_skip : 1)));
D(bug("Triggered %d page faults in %ld usec (%.1f usec per fault)\n", n_page_faults, duration, double(duration) / double(n_page_faults)));
return ((duration / VOSF_PROFITABLE_TRIES) < (VOSF_PROFITABLE_THRESHOLD * (frame_skip ? frame_skip : 1)));
}