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sna/dri: Remove busy-wait spin from vblank chaining of swapbuffers 

The issue being that, due to the delay, the chained swap would miss its
intended vblank and so cause an unwanted reduction in frame throughput
and increase output latency even further. Since both client and server
have other rate-limiting processes in place, we can forgo the stall here
and still keep the clients in check.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=54274
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
This commit is contained in:
Chris Wilson 2012-09-01 10:36:09 +01:00
parent b56e8c5105
commit f837807cc2
1 changed files with 0 additions and 3 deletions
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3
src/sna/sna_dri.c
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@ -1268,9 +1268,6 @@ void sna_dri_vblank_handler(struct sna *sna, struct drm_event_vblank *event)
break;
case DRI2_SWAP_THROTTLE:
if (!sna_dri_blit_complete(sna, info))
return;
DBG(("%s: %d complete, frame=%d tv=%d.%06d\n",
__FUNCTION__, info->type,
event->sequence, event->tv_sec, event->tv_usec));