Hi,

I developed a software that relies on a usb stick to communicate with a radio network. The USB stick essentially is a usb serial converter (pl2303), it is correctly detected and found in /dev/ttyUSB0. If I just plug the Usb stick into the devboard and then run my programm everything works fine. But when I use a usb hub between the stick and the board, then run my programm, the whole system is going very slow (ssh connection takes years to connect, a simple "ps" takes about 2 sec ...). I already tried another usb hub, same problem.
USB-Stick -> devboard => runs fine
USB-Stick -> USB hub -> devboard => everything slow

So do you have any suggestions what could cause this problem or what i can do?

Thanks in advance

Try FTDI chip based USB to serial converter. PL* and some other "low end" converters have issues with drivers (also applies to PC's, MAC's, etc).

hi

thanks for your reply.
I think I didn't express myself clearly enough, I can't modify the usb stick (I just bought it), so I can't change the pl2303 to a ftdi chip.
The stick also works fine on windows and linux machines (both with and without hub).
You got any other suggestions?

You can debug usb driver, this could help answering some questions. Else, try different hardware configurations.

Are you using wi-fi? Then try turning it off.

yes i'm using wifi. I disabled it but that didn't help