On Feb 4, 2008 8:20 PM, Kalle Valo <kalle.valo@xxxxxxxxx> wrote: > Sam Leffler <sam@xxxxxxxxx> writes: > > >>> I see. Rate scale algorithm only tels FW from what rate to start > >>> transmission. FW is responsible to do downscaling. Which is quite > >>> reasonable as retransmission is real time process. Instead of > >>> retransmitting on the same rate FW downscales. T X response provides > >>> to the rate scaling algorithm the successful rate. > >> > >> I just want to point out this is an important feature when the bus is > >> very slow, for example SPI bus in embedded devices. Retransfering > >> frames through SPI for every rate restransmit would make such a device > >> extremely slow. > > > > I don't know of a part that does repeated DMA to implement retransmit; > > do you have an example? > > Asking me? No, I have never heard of such a device. > Actually what is probably happening with some devices, I'm not sure though, they retries in FW/HW but do not downscale. Tomas > Kalle Valo > - 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
