| Bug ID | 84663 |
|---|---|
| Summary | high cpu usage, poor performance in Borderlands 2 with radeonsi, PRIME |
| Product | Mesa |
| Version | git |
| Hardware | Other |
| OS | All |
| Status | NEW |
| Severity | normal |
| Priority | medium |
| Component | Drivers/Gallium/radeonsi |
| Assignee | dri-devel@lists.freedesktop.org |
| Reporter | haagch@frickel.club |
Created attachment 107328 [details] sysprof recording from borderlands 2 only 00:02.0 VGA compatible controller: Intel Corporation 3rd Gen Core processor Graphics Controller (rev 09) 01:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Wimbledon XT [Radeon HD 7970M] (rev ff) xorg stable, mesa git, linux 3.17-rc7. I have had something similar in some games I think, but most recently with Borderlands 2. Here is a random screenshot with the HUD fps display from someone with a HD 7870 that shows that it runs mostly with 60 fps: https://i.imgur.com/qH0sBkl.jpg And here is a short clip of how it runs for me that shows it runs with 20-30 fps: https://www.youtube.com/watch?v=ZeZreRntt3k Radeontop says that the gpu is only used to ~30%. While running Borderlands 2 the CPU usage is always at 100+% on my i7 3632qm. I was undecided whether to report this here, but the difference is quite large so I thought I'd give it a try because I think the game itself is not supposed to use this much cpu time, so maybe it has something to do with the driver. Theories: < glennk> guessing from that output that the game engine uses a lot of occlusion queries and is stalling on them I haven't really found anything to test that yet. < agd5f> haagch, hybrid laptops have to do a lot of extra copying to get the frame from the rendering GPU to the display GPU I hope that the overhead is not *that* large because losing 70+% of gpu time would make it kind of useless for the affected games. Fortunately many (most?) games run much better, for example unigine valley shows good gpu usage: https://www.youtube.com/watch?v=sLWvYJlfvWM which makes me believe that there is a specific bottleneck. Attached is a sysprof profile of borderlands 2 but I don't know which of it is normal (like 25% total cpu time for glDrawRangeElements?).
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