[PATCH xserver 0/3] glamor: Accelerate XY format images

[Eric Anholt]

Adam Jackson <ajax at redhat.com> writes:

> On Fri, 2016-09-30 at 22:43 -0700, Keith Packard wrote:
>
>>        1                 2                 Operation
>> ------------   -------------------------   -------------------------
>>      10900.0        99900.0 (     9.165)   PutImage XY 10x10 square 
>>       1740.0         2160.0 (     1.241)   PutImage XY 100x100 square 
>>         83.2           90.4 (     1.087)   PutImage XY 500x500 square 
>
> 90 ops per second is still shameful. No blit should take 11ms.
>
>>      11800.0       351000.0 (    29.746)   PutImage XYBitmap 10x10 square 
>>       6280.0        81600.0 (    12.994)   PutImage XYBitmap 100x100 square 
>>        752.0        14300.0 (    19.016)   PutImage XYBitmap 500x500 square 
>
> Where does one get a copy of x11perf that has this test?
>
> Also I assume this is measuring before the whole series vs after. Would
> be nice to see the impact between 2/3 and 3/3 too.
>
>> I'd like to know why the GPU expansion version has so much GL
>> overhead; it "should" be faster for everything as it uploads a lot
>> less data to the GPU.
>
> On i965, at least, scissor updates are an appreciable amount of gl
> driver time, so small ops get punished.

Not sure if you've seen this, but it helped i965 a ton.  Radeon already
had equivalent code.

https://lists.freedesktop.org/archives/mesa-dev/2016-September/129809.html
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