On 20:20 26-Apr 2015 Stefan Sperling wrote:
> On Sun, Apr 26, 2015 at 01:31:17PM +0200, Stefan Sperling wrote:
> > On Sun, Apr 19, 2015 at 11:48:32PM +0300, Mikhail wrote:
> > > Bellow new version of the patch with above things fixed, also I've fixed
> > > detection of ETV chip in urtwn_attach(), nothing else is changed.
> >
> > I'm seeing very low data transmission rates with your patch and a
> > TP-Link TL-WN725N device. In both 11b and 11g mode, the data rate
> > remains very low (less than 100Kbit/s). A different urtwn(4) device
> > (with 8188CUS chip) has much better throughput.
> >
> > Are you seeing this, too?
>
> The chunk below is wrong for OpenBSD since it sets the intitial transmit
> rate to an 11n rate. 0x13 corresponds to the "MCS7" 11n rate,
> see linux/drivers/net/wireless/rtlwifi/rtl8188ee/def.h enum rtl_desc92c_rate.
> The value 11 corresponds to OFDM 54Mbit which is fine for OpenBSD.
> We only support 11a/b/g at present.
>
> --- sys/dev/usb/if_urtwn.c 14 Mar 2015 03:38:49 -0000 1.43
> +++ sys/dev/usb/if_urtwn.c 19 Apr 2015 20:27:41 -0000
> @@ -1813,7 +2011,10 @@ urtwn_tx(struct urtwn_softc *sc, struct
> txd->txdw4 |= htole32(SM(R92C_TXDW4_RTSRATE, 8));
> txd->txdw5 |= htole32(0x0001ff00);
> /* Send data at OFDM54. */
> - txd->txdw5 |= htole32(SM(R92C_TXDW5_DATARATE, 11));
> + if (sc->chip & URTWN_CHIP_88E)
> + txd->txdw5 |= htole32(0x13 & 0x3f);
> + else
> + txd->txdw5 |= htole32(SM(R92C_TXDW5_DATARATE, 11));
>
> } else {
> txd->txdw1 |= htole32(
>
> Reverting this change doesn't fix the transmit speed problem, unfortunately.
>
> I wonder if we're making some mistake while setting up the TX descriptor?
> There are several differences in the TX descriptors of 88E vs 92C.
> For example, 88E has third antenna C available.
Hello, in urtwn_init(), in part:
if (sc->chip & URTWN_CHIP_88E)
urtwn_write_1(sc, R92C_RXDMA_AGG_PG_TH + 1, 4);
else
urtwn_write_1(sc, R92C_USB_DMA_AGG_TO, 4);
comment first 3 lines. It fixes speed problem for me, but I need to
understand the issue further, before proposing any solution.
