ftdi-usb-sio-devel

[Patrick B. <bee...@gm...>]

So, I realize that the ftdi_sio in Linux default to ASYNC_LOW_LATENCY so 
latency_timer=1.  However, I have noticed that I still have quite a bit 
of latency in the system when compared to Windows.  I can run the EXACT 
same code on a Windows machine and get MUCH faster IO than in Linux.  
Does anyone out there know where this hidden latency lies?  I don't 
recall this being the case prior to the ASYNC_LATENCY_LOW flag, but it 
also does it when I turn than off and set the latency manually (to 1, 2 
,3, etc.).  I can make it go slower (e.g. 64 ms), but not faster.