[Ftdi-usb-sio-devel] latency on serial port

[Tao J. <jin...@gm...>]

Dear all,

I am trying to get my laptop running Ubuntu to communicate with a
sensor through serial interface.  I used usb-to-serial adapter to
connect the laptop and sensor serial RX/TX pins.  I observed a long
latency when I do a one-byte serial echo test, around 10ms.

I googled a bit, and seems a lot of people had the same issue. someone
said setserial /dev/ttyS* low_latency can get the serial device work
in low latency mode, with higher CPU load.  I tried, that doesn't work
for me.

Anyone here know about this latency issue on serial link?  Could you
please provide some guidance to resolve this issue?

Thanks a lot in advance!

jintao