Bug 109021 - Kaveri no fix perfomance
Summary: Kaveri no fix perfomance
Alias: None
Product: Mesa
Classification: Unclassified
Component: Drivers/Vulkan/radeon (show other bugs)
Version: unspecified
Hardware: x86-64 (AMD64) Linux (All)
: medium normal
Assignee: mesa-dev
QA Contact: mesa-dev
Depends on:
Reported: 2018-12-12 01:50 UTC by Dmitry
Modified: 2019-01-08 01:34 UTC (History)
0 users

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Description Dmitry 2018-12-12 01:50:32 UTC
Apparently fix Kaveri A10 7850K did not touch the RADV driver. I did a benchmark in the game Rise of the Tomb Raider before and after the fix, and FPS remained the same. Despite the fact that the fixed yields of approximately 50%.

P.S.Mesa RADV 18.2.6, linux kernel 4.19.8
Comment 1 Samuel Pitoiset 2018-12-12 12:41:12 UTC
I'm sorry but I don't understand what your report means.

What are you talking about? And what fix?
Comment 2 Dmitry 2018-12-12 12:50:43 UTC
Have 7850К earlier, it was stated the wrong number of render backends.

This should have been fixed in the new kernel version and Mesa 18.2, respectively. But in RADV, I'm seeing old performance.
Comment 3 Samuel Pitoiset 2018-12-12 12:58:25 UTC
This code is shared by RadeonSI and RADV, so I assume that commit should also help RADV.
Comment 4 Dmitry 2018-12-12 13:05:46 UTC
I also think. But I measured the FPS before and after the Mesa and kernel update.
Comment 5 Bas Nieuwenhuizen 2019-01-02 17:10:08 UTC
Note that the patch is a theoretical 2x benefit in a very specific case.

Do you have a GL game where there is a significant difference? Otherwise I'd assume this is just a specific bottleneck that is not hit a lot in practice and hence would not typically result in significant performance changes.
Comment 6 Dmitry 2019-01-02 21:23:35 UTC
GL games are not compared, only Vulkan. Because there is a suspicion that the patch is not touched RADV.
Comment 7 Bas Nieuwenhuizen 2019-01-08 00:42:48 UTC
Unless you have numbers that for GL it actually improves performance for some implications I'm not going to spend time on this.
Comment 8 Dmitry 2019-01-08 01:32:22 UTC
OK. Then close.

Hopefully pay attention to another important bug report.
Comment 9 Dmitry 2019-01-08 01:34:42 UTC
More precisely this, sorry.

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