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.
