Am Dienstag 13 Juli 2010 schrieb Ivo Van Doorn: > On Mon, Jul 12, 2010 at 9:14 PM, Helmut Schaa > <helmut.schaa@xxxxxxxxxxxxxx> wrote: > > Am Montag 12 Juli 2010 schrieb Ivo Van Doorn: > >> I am currently looking into the old problem of the mac80211 rate > >> control algorithms > >> and USB devices. The Ralink USB devices (and as far as I know, the > >> other USB devices > >> as well), do not work well with the PID and Minstrel algorithms. This > >> is caused by the > >> fact that USB devices do not report the TX status to mac80211. > > > > Ivo, do you know by any chance if the USB devices also have a TX_STA_FIFO > > register like the PCI variants? Does it contain useful data or just crap? > > Well I guess he has the registers (we don't have rt2870 specific specsheets, > but the register definitions from the original Ralink driver to > suggest the register > is there). However, even if it contains valid data, how do you want to match > the contents of that register with the sent frames in the queue? We could stuff a unique packet ID into the TXWI and the TX_STA_FIFO should contain the same ID alongside the TX status after the frame was processed by the hw. > And another downside, is that the above only applies to rt2800usb, and not > for rt73usb and rt2500usb, which neither have the TX status register, and were > replaced with statistics registers (which I want to read for the batch > TX status). Ok, that's a valid argument ... Helmut -- To unsubscribe from this list: send the line "unsubscribe linux-wireless" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
