#panfrost on 2023-02-09 — irc logs at oftc.irclog.whitequark.org

2022-12-21 00:45 ChanServ changed the topic of #panfrost to: Panfrost - FLOSS Mali Midgard + Bifrost + Valhall - Logs https://oftc.irclog.whitequark.org/panfrost - I don't know anything about WSI. That's my story and I'm sticking to it.

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02:53 <camio> I have an ODroid N2+. I periodically get gpu sched timeout errors when browsing using firefox.

02:53 <camio> They're accompanied with another strange kernel message.

02:53 <camio> Feb 08 21:01:56 odroid kernel: panfrost ffe40000.gpu: gpu sched timeout, js=1, config=0x7301, status=0x0, head=0xa14a3c0, tail=0xa14a3c0, sched_job=000000007d2fd8ad

02:53 <camio> Feb 08 21:02:01 odroid kernel: meson_clk_pll_set_rate: pll did not lock, trying to restore old rate 3816000000

02:54 <camio> I'm wondering how best to troubleshoot this. Would it be worth it for me to increase JOB_TIMEOUT_MS and see if that does something?

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04:12 <jdavidberger> Anyone have any insight why reading from GPU memory is 20x slower than writing to GPU memory on a bifrost gpu sort of no matter what flags I use?

04:13 <jdavidberger> The benchmark code for it is here: https://github.com/jdavidberger/minipeak/blob/main/apps/glmempeak.cpp

05:50 <HdkR> jdavidberger: Because of how the memory is mapped and which flags are used

06:07 <HdkR> I don't remember which flags are used for normal memory versus GPU memory, but it will be different. :)

06:07 <jdavidberger> I'd expect this with GL_MAP_COHERENT_BIT but not with just read/write. But that code basically tries every combination of flags available to gles and gets the same results

06:08 <HdkR> This will be memory flags for the hardware rather than GL flags. Something like uncached

06:09 <HdkR> Or write-combine more likely

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06:34 <jdavidberger> so like here: https://elixir.bootlin.com/linux/latest/source/drivers/gpu/drm/panfrost/panfrost_gem.c#L232 ?

06:47 <HdkR> Looks like the one

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09:53 <robmur01> Except on a handful of certain SoCs, "GPU memory" is regular memory mapped non-cacheable, so you really want to avoid reading from it as much as possible

09:54 <HdkR> We need these fully coherent SoCs that can snoop each others caches :)

09:55 <HdkR> NVIDIA Grace-Hopper says hello on its way to the server room

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12:04 <Googulator> Greetings! I'm trying out bbrezillon's pancsf kernel (with some modifications to bring it up on a Rock 5B), and have gotten to the point where I have a working desktop with the pancsf kernel driver loaded. Where can I find the repository where the corresponding userspace driver is being developed?

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