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Haven't used Mango HUD, but I think it was forked from Mesa Vulkan overlay and diverged into its own direction.
But similar idea I suppose. If Mango HUD can log the values you need - you can use that all the same for analysis.
Last edited by Shmerl on 31 October 2022 at 5:56 am UTC
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Yeah I've been using MangoHud's frame time graph and logging functionality, which check out, no spikes upwards.
I usually limit to 66FPS by the way, but that's just a habit I got from using Nvidia's "fast sync" on Windows years ago, where any frames delivered before the next refresh are discarded (bloody fantastic solution that was, wish we had that).
Unlimited framerates exhibit the same issue. I've updated the main post thanks to your good questions.
Will try 59fps as my limit, thanks! :)
Last edited by ridge on 31 October 2022 at 6:01 am UTC
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Search about MESA_VK_WSI_PRESENT_MODE usage here: https://docs.mesa3d.org/envvars.html
Details on logic here: https://registry.khronos.org/vulkan/specs/1.3-extensions/man/html/VkPresentModeKHR.html
Last edited by Shmerl on 31 October 2022 at 6:04 am UTC
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Or instead of limiting try using one of the alternatives to vsync from those present modes. I think one of them is similar to what AMD call "enhanced sync".
Last edited by Shmerl on 31 October 2022 at 6:13 am UTC
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Oh, right! Yeah didn't think about that myself either but it makes sense now that you bring it up haha. Not worried about tearing BTW.
Yeah, saw your link; had no idea about these envvars! Gonna experiment with those when I have time 😁 Really appreciate it.
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Today I updated to Plasma 6.1 Beta and Mesa 24.1, and sure enough, frame pacing is OK now with vsync off!
Turns out implicit synchronisation was the problem all along, explicit sync was the solution. Very happy about this development.
Suppose that solves the thread at long last. Thanks to everyone who posted educated inputs.
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How did your stutter look like? Was it always stuttery or does it happen in an (not exactly set) interval? Like once every 10-30 seconds?
Currently running fedora kinoite 40, but I did manage to overlay the 6.10 kernel and run mesa-git inside steam flatpak (although I'm not sure if it works correctly). KDE is 6.0.5 which should have the explicit sync implementation.
If your stutter was always happening I'm planning to get an SSD to just temporarily install ArchLinux (which as you can guess is not something I'd want to do for a small test :D).
At least for me the framegraphs were smooth on both MangoHud and DXVK_HUD.
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