On Tue, May 23, 2017 at 2:45 AM, Michel Dänzer <michel at daenzer.net> wrote: > On 22/05/17 07:09 PM, Marek Olšák wrote: >> On Mon, May 22, 2017 at 12:00 PM, Michel Dänzer <michel at daenzer.net> wrote: >>> On 20/05/17 06:26 PM, Marek Olšák wrote: >>>> On May 20, 2017 3:26 AM, "Michel Dänzer" <michel at daenzer.net >>>> <mailto:michel at daenzer.net>> wrote: >>>> >>>> On 20/05/17 01:14 AM, Marek Olšák wrote: >>>> > Hi Michel, >>>> > >>>> > I've applied your series >>>> >>>> Thanks for testing it. >>>> >>>> > and it doesn't help with low Dirt Rally performance on Fiji. I see TTM >>>> > buffer moves at 800MB/s and many VRAM page faults. >>>> >>>> Did you see this: >>>> >>>> >> Note that there's only little if any improvement of the average >>>> framerate >>>> >> reported, but the minimum framerate as seen on the HUD goes from >>>> ~10 fps >>>> >> to ~17. >>>> >>>> I.e. it mostly affects the minimum framerate and smoothness for me >>>> as well. >>>> >>>> >>>> Without the series, I get 70 average fps. With the series, I get 30 >>>> average fps. That might just be random bad luck. I don't know. >>> >>> Hmm, yeah, maybe that was just one of the random slowdowns you've been >>> talking about in other threads and on IRC? >>> >>> I can't reproduce any slowdown with these patches, even leaving visible >>> VRAM size at 256 MB. >> >> The random slowdowns with Dirt Rally are only caused by the pressure >> on visible VRAM. This whole thread is about those random slowdowns. > > No, this thread is about the scenario described in the cover letter of > this patch series. > > >> If you're saying "maybe it was just one of the random slowdowns", you're >> saying "maybe it was just the visible VRAM pressure". It's only >> random with Dirt Rally, which makes it difficult to believe statements >> such as "I can't reproduce any slowdown". > > I could say the same thing about you seeing random slowdowns... I've > never seen that, I had to artificially limit the size of visible VRAM to > 64 MB to make it significantly affect the benchmark result. > > How many times do you need to run the benchmark on average to hit a > random slowdown? Which desktop environment and other X clients are > running during the benchmark? Which tab is active in the Steam window > while the benchmark runs? > > In my case, it's only xfwm4, xterm and steam on the Dirt Rally page in > the library. Ubuntu Unity, Steam small mode (there are no tabs), Ultra settings in Dirt Rally. Every single time I run the game with this series, I get 700-1000MB/s of TTM BO moves. There doesn't seem to be any randomness. It was better without this series. (meaning it was sometimes OK, sometimes bad) Marek
