On Mon, Jan 10, 2011 at 03:34:19PM -0800, Donna Rigas wrote: > kernel version: 2.6.29.6 Wow, that's really old and obsolete and unsupported. Can you try something a bit more modern (i.e. written in the past year at the least?) > Alan Cox wrote: > >On Mon, 10 Jan 2011 13:23:46 -0800 > >Donna Rigas <donna.rigas@xxxxxxxxx> wrote: > > > >>Can anyone tell me how to change the rx and tx fifo sizes for a > >>USB virtual serial port? We're trying to run at high effective > >>baud rates (would like to utilize the full 12mbps of our USB 1.1 > >>device), and servicing a read routine at 16Hz. Initial > >>investigations reveal what looks like a buffer size of PAGE_SIZE > >>(but we may have looked in the wrong area), or 4K. We can't > >>easily service the read routine faster than 16Hz, which if our > >>math is right, that means we'll average 7500 byte reads if we > >>utilize 100% of the throughput. On the host side, we're using > >>the cdc_acm driver, and on the device side (if it matters at > >>all), we're using LPCUSB. What usb to serial device are you using that you need to control the uart size? Not all of them allow this type of control to be made. thanks, greg k-h -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
