https://bugs.freedesktop.org/show_bug.cgi?id=43191
Bug #: 43191
Summary: AMD E-350 needs 2D (MACRO) color tiling to perform
well, but fully enabling it results in scanout
corruption
Classification: Unclassified
Product: xorg
Version: unspecified
Platform: Other
OS/Version: All
Status: NEW
Severity: normal
Priority: medium
Component: Driver/Radeon
AssignedTo: [email protected]
ReportedBy: [email protected]
QAContact: [email protected]
Created attachment 53797
--> https://bugs.freedesktop.org/attachment.cgi?id=53797
Patch to enable color tiling on Evergreen.
I'm trying to get AMD E-350 graphics performance up to the level I experience
on Intel Pineview (open source drivers in both cases), and I hit performance
issues with blits.
On #radeon IRC, rak_adam confirmed via compute shaders that I should be able to
achieve the blit speed I achieve on Intel (he measured around 7 GBit/s, I need
around 4GBit/s).
At agd5f's suggestion, I've enabled Mesa-side tiling with the R600_TILING
environment variable. I've used the attached patch (written by Alex, but
completely untested by him) to get the DDX to do tiling as well, but this
results in corrupted scanout.
I'm using Linux kernel 3.1.0. I'm going to dig into this myself, and see if I
can find a fix.
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