This diff fixes an athn(4) performance regression on 2GHz.
Before I added 11n support athn(4), the driver used to send RTS frames
at 2 Mbit/s while operating in the 2GHz band.
I changed this to 1 Mbit/s for consistency with other drivers.
However, it turns out that the chip does not do what I am asking for.
My athn(4) AP for some reason ends up sending RTS at frames 9 Mbit/s (OFDM).
Such frames get lost easily under poor radio conditions, which delays
data frames and hurts throughput. This fix restores the previous behaviour.
Index: ar5008.c
===================================================================
RCS file: /cvs/src/sys/dev/ic/ar5008.c,v
retrieving revision 1.44
diff -u -p -r1.44 ar5008.c
--- ar5008.c 26 Apr 2017 07:53:17 -0000 1.44
+++ ar5008.c 16 Jul 2017 13:00:37 -0000
@@ -1601,7 +1601,7 @@ ar5008_tx(struct athn_softc *sc, struct
}
/* Select protection rate (suboptimal but ok). */
protridx = IEEE80211_IS_CHAN_5GHZ(ni->ni_chan) ?
- ATHN_RIDX_OFDM6 : ATHN_RIDX_CCK1;
+ ATHN_RIDX_OFDM6 : ATHN_RIDX_CCK2;
if (ds->ds_ctl0 & AR_TXC0_RTS_ENABLE) {
/* Account for CTS duration. */
dur += athn_txtime(sc, IEEE80211_ACK_LEN,
