On Thu, 24 May 2018 15:26:23 +0800 zou lan <nancy.lan....@gmail.com> wrote:
> Hi pekka > > >>are the c2p numbers from weston-presentation-shm demo? > yes. I use this demo. My clock is CLOCK_MONOTONIC. > > I check the drm kernel code, I find each vblank event send the last > vblank's timestamp. > > system time sec msec > [ 263.000526] vblank_event 262 983 > [ 263.017236] vblank_event 263 0 > [ 263.033864] vblank_event 263 17 > [ 263.050533] vblank_event 263 33 > [ 263.067215] vblank_event 263 50 > > I think that's should be the main reason cause the c2p time weird. I don't > know why kernel return last frame's timestamp. I am still debuging it. Indeed, that does not sound right. Maybe contact the driver developers about this? Which kernel display driver are you using? Thanks, pq
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