On 15 Oct 2008, at 10:35, Jean-Marc Beaune wrote:
...
I'm trying to use usb to serial converter, the data transfer works but it's very very slow.
 
I use FTDI converter with kernel 2.6.25-r7 build in driver.
 
How could I trave where the problem comes from?

Unless you give more information one might assume that your slowness is only that inherent in a serial connection.

Stroller.