Overclock USB Controller Polling Rate

Rion · 6 Dec 2019, 16:09

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).

mitu · 6 Dec 2019, 17:13

@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.

vretro · 8 Dec 2019, 00:22

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/4407/848

Hopefully we can get “usbhid.jspoll=1” added to the end line of “/boot/cmdline.txt” in a future build of RetroPie.

/cc @BuZz

TheBattleMaster · 8 Dec 2019, 01:24

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?

BuZz · 8 Dec 2019, 11:30

It won't be added by default. Users are free to make these changes.

WeirdH · 11 Dec 2019, 16:17

@Rion said in Overclock USB Controller Polling Rate:

@vretro @mitu

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)

IanDaemon · 11 Dec 2019, 16:40

@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.

Rion · 12 Dec 2019, 15:57

@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.

Rion · 12 Dec 2019, 16:04

@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.

Increase USB polling rate across all devices in linux?

TheBattleMaster · 14 Dec 2019, 03:33

@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.

WeirdH · 17 Dec 2019, 17:34

@IanDaemon I just changed the line in my cmdline.txt, but I don't really notice anything different.

GreenHawk84 · 27 Jan 2020, 18:37

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.