[Mesa-dev] [PATCH 1/3] vl/dri3: use external texture as back buffers

[Nayan Deshmukh]

On Thu, Oct 27, 2016 at 11:52:13AM +0100, Andy Furniss wrote:
> Andy Furniss wrote:
> > Michel Dänzer wrote:
> > > On 26/10/16 08:07 PM, Andy Furniss wrote:
> > > > 
> > > > The bad = Starting with DRI3 (which is default) I still get trashed
> > > > rendering full screen. Windowed including re-sizing seems OK.
> > > > 
> > > > I use Fluxbox window manager, which does not use compositing -
> > > > IIRC this has historically shown some ddx DRI2/3 issue that wasn't
> > > > visible to those testing with compositing (but then the full screen
> > > > case may avoid compositing anyway depending on settings).
> > > 
> > > You may be running into a DDX driver issue fixed by
> > > https://patchwork.freedesktop.org/patch/118514/ .
> > 
> > Yes, that was it, OK with that patch.
> 
> Though "OK", sub-optimal loosing pageflip on tonga, as a vsync test
> fails top 5% of screen unless I force GPU perf high.

This reason for this is that in case of single gpu, I have to recalculate 
its handle and get a pixmap from that buffer for each frame. This calulation 
is avoided due to the presence of a linear buffer in case of different gpu.

Regards,
Nayan
> 
> Not related to this patch directly of course, but I am a bit surprised
> that on auto powerplay the tonga is too slow to make 60Hz.
> 
> Tested with CPU forced high, so it's not CPU freq.
> 
>