On Fri, Apr 14, 2017 at 12:14 PM, Michel Dänzer <mic...@daenzer.net> wrote: > On 04/04/17 05:11 AM, Marek Olšák wrote: >> On Fri, Mar 31, 2017 at 5:24 AM, Michel Dänzer <mic...@daenzer.net> wrote: >>> On 30/03/17 07:03 PM, Michel Dänzer wrote: >>>> On 25/03/17 01:33 AM, Marek Olšák wrote: >>>>> Hi, >>>>> >>>>> I'm sharing this idea here, because it's something that has been >>>>> decreasing our performance a lot recently, for example: >>>>> http://openbenchmarking.org/prospect/1703011-RI-RADEONDIR06/7b7668cfc109d1c3dc27e871c8aea71ca13f23fa >>>> >>>> The attached proof-of-concept patch (on top of Christian's "CPU mapping >>>> of split VRAM buffers" series, ported from radeon) results in 145.05 fps >>>> on my Tonga. >>> >>> I get the same result without my or Christian's patches though, with >>> 4.11 based DRM or amd-staging-4.9. So I guess I just can't reproduce the >>> problem with this test. Are there any other tests for it? >> >> It's random. Sometimes the benchmark runs OK, other times it's slow. >> You can easily see the difference but observing how smooth it is. The >> visible VRAM evictions result in constant 100-200ms stalls but not >> every frame, which feels like the frame rate is much lower than it >> actually is. >> >> Make sure your graphics details are maxed out. The best score I can >> get with my rig is 70 fps. (Fiji & Core i5 3570) > > I'm getting around 53-54 fps at Ultra with Tonga, both with Mesa 13.0.6 > and Git. > > Have you tried if Christian's patches for CPU access to split VRAM > buffers help? I can imagine that forcing contiguous VRAM buffers for CPU > access could cause lots of other BOs to be unnecessarily evicted from > VRAM, if at least one of their fragments happens to be in the CPU > visible part of VRAM.
I've finally tested latest amd-staging-4.9 and I'm very pleased. For the first time, the Deus Ex benchmark has almost no hiccups. I've never seen it so smooth. At one point, the MB/s BO move rate increase to 200MB/s, stayed there for a couple of seconds, and then it dropped to 0 again. The frame rate was OK-ish, so I guess the moves didn't happen all at once. I also tested DiRT Rally and I haven't been able to reproduce the low FPS with the consistently-high BO move rate that I saw several months ago. We could do some move throttling there for sure, but it's much better than it ever was. Marek _______________________________________________ amd-gfx mailing list amd-gfx@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/amd-gfx
