how to do i set bulk usb transfer rate

I have a raspberry pi with Ubuntu 20.04 (installed from the image ubuntu-20.04.3-preinstalled-server-arm64+raspi.img).

I want to set the bulk USB transfer rate to 150.

Here is how I do it on Raspberry Pi OS:

• Open /etc/rc.local with an editor.

• Add the following line at the end of the file before exit 0:

sudo sh -c 'echo 150 > /sys/module/usbcore/parameters/usbfs_memory_mb'

• Save & Close the file and reboot the system.

How do I do this on Ubuntu?

Use the systemd start up service instead it actually says rc.local is no longer running upon boot up on Raspberry Pi4

so create a file like this

sudo vi /etc/systemd/system/usb_bulk_transfer_rate.service

write this for example

[Unit] Description=set usb bulk transfer rate After=multi-user.target

[Service] ExecStart=/usr/bin/python3 /home/pi/cams/src/acp/sonyCam/write_bulk_transfer_usb.py

[Install] WantedBy=multi-user.target

then write this in the python file (or what ever you prefer to use) cd /home/pi/cams/src/acp/sonyCam sudo vi write_bulk_transfer_usb.py

with open("/sys/module/usbcore/parameters/usbfs_memory_mb", "w") as f: print("150", file=f) f.close()

then start the service as follows

sudo systemctl enable usb_bulk_transfer_rate.service sudo systemctl start usb_bulk_transfer_rate.service sudo systemctl status usb_bulk_transfer_rate.service

check success by looking for 150 returned from the command

pi@CameraPi:~/cams/src/acp/sonyCam $ cat /sys/module/usbcore/parameters/usbfs_memory_mb 150