The Linux iwlwifi driver uses less retry attempts for management frames,
as in the diff below. I think it makes sense to do likewise.
Index: if_iwm.c
===================================================================
RCS file: /cvs/src/sys/dev/pci/if_iwm.c,v
retrieving revision 1.92
diff -u -p -r1.92 if_iwm.c
--- if_iwm.c 22 Jun 2016 11:32:12 -0000 1.92
+++ if_iwm.c 22 Jun 2016 13:15:38 -0000
@@ -4381,6 +4381,7 @@ iwm_tx_fill_cmd(struct iwm_softc *sc, st
/* for non-data, use the lowest supported rate */
ridx = (IEEE80211_IS_CHAN_5GHZ(ni->ni_chan)) ?
IWM_RIDX_OFDM : IWM_RIDX_CCK;
+ tx->data_retry_limit = IWM_MGMT_DFAULT_RETRY_LIMIT;
} else if (ic->ic_fixed_mcs != -1) {
ridx = sc->sc_fixed_ridx;
} else if (ic->ic_fixed_rate != -1) {
