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Commit caabf2bf authored by Felix Fietkau's avatar Felix Fietkau Committed by John W. Linville
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ath9k_hw: fix the slot time setting for long distance links 



Testing shows that adjusting the slot time based on the coverage class
produces very high latencies and very low throughput on long distance links.

Adjusting only the ACK timeout and leaving the slot time at the regular
values - while technically not optimal for CSMA - works a lot better on
long links (tested with 10 km distance)

Signed-off-by: default avatarFelix Fietkau <nbd@openwrt.org>
Signed-off-by: default avatarJohn W. Linville <linville@tuxdriver.com>
parent 4357c6bf

drivers/net/wireless/ath/ath9k/hw.c

+1 −1
Original line number Original line Diff line number Diff line
@@ -808,7 +808,7 @@ void ath9k_hw_init_global_settings(struct ath_hw *ah) 
	if (conf->channel && conf->channel->band == IEEE80211_BAND_2GHZ)

	if (conf->channel && conf->channel->band == IEEE80211_BAND_2GHZ)

		acktimeout += 64 - sifstime - ah->slottime;

		acktimeout += 64 - sifstime - ah->slottime;





	ath9k_hw_setslottime(ah, slottime);

	ath9k_hw_setslottime(ah, ah->slottime);

	ath9k_hw_set_ack_timeout(ah, acktimeout);

	ath9k_hw_set_ack_timeout(ah, acktimeout);

	ath9k_hw_set_cts_timeout(ah, acktimeout);

	ath9k_hw_set_cts_timeout(ah, acktimeout);

	if (ah->globaltxtimeout != (u32) -1)

	if (ah->globaltxtimeout != (u32) -1)