https://bugs.freedesktop.org/show_bug.cgi?id=97549
--- Comment #5 from Eero Tamminen <[email protected]> ---
(In reply to Michel Dänzer from comment #4)
> Created attachment 126214 [details] [review]
> Always use at least two buffers
>
> Does this patch fix the problem?
Yes, but that's not all...
BXT performance raised a lot in the affected programs end of last week (some
more than the drop, some less than the drop). This was due Chris' commit
adding BXT & KBL PCI IDs to xf86-video-intel. I assume with this, X will be
using SNA also on BXT instead of the "default acceleration" that uses (slow)
legacy blitter.
So, I did few tests:
* BXT: reverting the "Overhaul dri3_update_num_back" with the new X DDX didn't
affect the performance (same good one)
* BXT: with old X DDX attached patch fixes the drops
* BXT: with new X DDX attached patch doesn't give additional improvement
* SNB: attached patch fixes the drops
Comments:
- This isn't necessarily Mesa issue, but X DDX one
- Something fishy with SNB for which it would be good to get comment from Chris
Still TODO:
-Check modesetting driver perf with the before and after the commit
- Provide requested info from GDB
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