[Mesa-dev] Mesa (master): 29 new commits

Nicolai Hähnle nhaehnle at gmail.com
Thu Apr 21 18:35:36 UTC 2016

On 20.04.2016 23:02, Michel Dänzer wrote:
> On 21.04.2016 02:42, Marek Olšák wrote:
>> On Thu, Apr 14, 2016 at 9:29 AM, Michel Dänzer <michel at daenzer.net> wrote:
>>> On 14.04.2016 11:37, Michel Dänzer wrote:
>>>> On 12.04.2016 21:33, Marek =?UNKNOWN?B?T2zFocOhaw==?= wrote:
>>>>> URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=5a4b74d1ba2c156766a7a5dbfef099c7db5d6694
>>>>> Author: Marek Olšák <marek.olsak at amd.com>
>>>>> Date:   Mon Apr 11 19:56:07 2016 +0200
>>>>>      gallium/radeon: relax requirements on VRAM placements on APUs
>>>> This change caused a bunch of ARB_shader_load_image_store piglit tests
>>>> to fail on my Kaveri, see some examples below. The incorrect values
>>>> seem consistent.
>>>> I suppose some buffers end up in GTT instead of VRAM with this
>>>> change, but I'm not sure how that could cause problems. Any ideas?
>>> Also, with the code modified to use GTT only for everything but
>>> (potential) scanout buffers, the performance of Unigine Valley and the
>>> Unreal Engine 4 Elemental demo is reduced by about 30%. So the premise
>>> that GTT is about as fast as VRAM doesn't seem to hold true in practice
>>> (at least with Kaveri and presumably other (pre-)CIK APUs; maybe it's
>>> better with Carrizo and newer), which means that this change may cause
>>> performance of long-running processes to drop significantly over time.
>>> Given all these issues, I'm afraid it may be better to revert this
>>> change for now, until we have a better plan for dealing with this.
>> Assuming you use the radeon kernel driver and you are not busy, would
>> you please check whether the performance is lower on amdgpu as well?
> I am using the radeon driver, but also quite busy. Nicolai, can you try
> it on your Carrizo?

I can probably get to it later today.



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