Re: [PATCH v7 0/6] V4L2 Explicit Synchronization

[Gustavo Padovan]

2018-01-10 Nicolas Dufresne <nicolas@xxxxxxxxxxxx>:

> Le mercredi 10 janvier 2018 à 14:07 -0200, Gustavo Padovan a écrit :
> > v7 bring a fix for a crash when not using fences and a uAPI fix.
> > I've done a bit more of testing on it and also measured some
> > performance. On a intel laptop a DRM<->V4L2 pipeline with fences is
> > runnning twice as faster than the same pipeline with no fences.
> 
> What does it mean twice faster here ?

That capture then display on the screen for a given number of frames was
completing in about half of the time when using fences and passing then
to the other driver right away when they are received.

Gustavo