Overclock USB Controller Polling Rate
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Is it possible on Raspberry Pi to Overclock the USB Polling Rate to reduce input latency of attached controllers?
I learned of the concept from this post about doing exactly that on the MiSTer device, which has a Linux Kernel:
https://github.com/eniva/MisSTer_Guides/wiki/Overclock-USB-Controllers-Polling-Rate -
I'd say it's not possible, since it uses a custom kernel and the modifications they may have done are not included in the Raspbian provided kernel.
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Sure it is. @Brunnis recently covered this is his post An input lag-investigation
1000 Hz polling for USB gamepads (add usbhid.jspoll=1 at end of line in /boot/cmdline.txt in Raspbian).
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@Rion That's great, it means that the kernel used by MiSter board is older than the one included in Raspberry Pi if it needs additional patches.
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I knew it had to be possible some how @Rion, while not using the exact same method as seen on MiSTer @mitu, thanks @Rion and thank you @Brunnis - every millisecond counts!
There are some good extra tips for reducing latency in that post worth checking out:
https://forums.libretro.com/t/an-input-lag-investigation/4407/848Hopefully we can get “usbhid.jspoll=1” added to the end line of “/boot/cmdline.txt” in a future build of RetroPie.
/cc @BuZz
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Besides adding that line to cmdline.txt, are other actions or precautions necessary?
Is this on the same level of risk (of increasing temp.) as overclocking the GPU/CPU of the Pi? -
It won't be added by default. Users are free to make these changes.
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@Rion said in Overclock USB Controller Polling Rate:
Sure it is. @Brunnis recently covered this is his post An input lag-investigation
1000 Hz polling for USB gamepads (add usbhid.jspoll=1 at end of line in /boot/cmdline.txt in Raspbian).
Is this also possible or even beneficial for usb input encoders for arcade controls? (I believe I have DragonRise)
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@WeirdH I'm curious as to the answer to your “usb encoder” question, however I have to wonder that if it was always beneficial (or at least not a detriment) the functionality would be the default. Again, I look forward to the answer to your question.
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@TheBattleMaster said in Overclock USB Controller Polling Rate:
Besides adding that line to cmdline.txt, are other actions or precautions necessary?
Is this on the same level of risk (of increasing temp.) as overclocking the GPU/CPU of the Pi?No you are just changing the Polling Rate for usb joysticks/game pads.
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@WeirdH I don't know if it's possible to change the Pooling Rate for Keyboards in Raspian. Mouse and joysticks/gamepads are implemented that i know of.
Found this while searching for the topic.
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@Rion said in Overclock USB Controller Polling Rate:
@TheBattleMaster said in Overclock USB Controller Polling Rate:
Besides adding that line to cmdline.txt, are other actions or precautions necessary?
Is this on the same level of risk (of increasing temp.) as overclocking the GPU/CPU of the Pi?No you are just changing the Polling Rate for usb joysticks/game pads.
Thanks for the info! Just needed some confirmation, because I haven't bought a fan for my setup yet.
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@IanDaemon I just changed the line in my cmdline.txt, but I don't really notice anything different.
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Hello, I tried this with my Xin-Mo arcade setup and while it sorta made things more responsive in games, it ended up making some wacky things happen in EmulationStation. When scrolling through systems left-right it would skip over a system sometimes even though I pressed it once. Same goes for up-down in the game lists, it would skip games over as if it were double tapping.
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