Messages in this thread | | | Date | Sat, 04 May 2013 16:44:05 +0400 | From | Stas Sergeev <> | Subject | Re: Regression: ftdi_sio is slow (since Wed Oct 10 15:05:06 2012) |
| |
04.05.2013 15:15, Johan Hovold пишет: > The query takes longer than the transmit at decent baudrates (>=38k) > and under the assumption that flow control isn't causing any delays. > > But you do have a point, and I have been meaning to look into whether > the added overhead of checking the hardware buffers could be mitigated > by adding wait_until_sent support to usb-serial. This way the we would > only query the hardware buffers on tty_wait_until_sent (e.g. at close) > and select and TIOCMOUTQ would not suffer. This is also the way things > are handled in serial_core. Thanks for taking a look. Indeed, it seems .wait_until_sent is the best candidate for that kind of things, and the patch in question would even match its description be it using .wait_until_sent and not .chars_in_buffer. Please count on testing your patches here when they are ready. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
| |