linux-kernel - Re: [PATCH v1 2/2] mac80211: minstrel

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Date:   Mon, 04 Apr 2022 20:21:24 +0200
From:   Toke Høiland-Jørgensen <toke@...e.dk>
To:     Peter Seiderer <ps.report@....net>, linux-wireless@...r.kernel.org
Cc:     Kalle Valo <kvalo@...nel.org>,
        "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Johannes Berg <johannes@...solutions.net>,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        Felix Fietkau <nbd@....name>
Subject: Re: [PATCH v1 2/2] mac80211: minstrel_ht: fill all requested rates

+Felix

Peter Seiderer <ps.report@....net> writes:

> Fill all requested rates (in case of ath9k 4 rate slots are
> available, so fill all 4 instead of only 3), improves throughput in
> noisy environment.

How did you test this? Could you quantify the gains in throughput you saw?

-Toke

> Signed-off-by: Peter Seiderer <ps.report@....net>
> ---
>  net/mac80211/rc80211_minstrel_ht.c | 14 +++++++-------
>  1 file changed, 7 insertions(+), 7 deletions(-)
>
> diff --git a/net/mac80211/rc80211_minstrel_ht.c b/net/mac80211/rc80211_minstrel_ht.c
> index 9c6ace858107..cd6a0f153688 100644
> --- a/net/mac80211/rc80211_minstrel_ht.c
> +++ b/net/mac80211/rc80211_minstrel_ht.c
> @@ -1436,17 +1436,17 @@ minstrel_ht_update_rates(struct minstrel_priv *mp, struct minstrel_ht_sta *mi)
>  	/* Start with max_tp_rate[0] */
>  	minstrel_ht_set_rate(mp, mi, rates, i++, mi->max_tp_rate[0]);
>  
> -	if (mp->hw->max_rates >= 3) {
> -		/* At least 3 tx rates supported, use max_tp_rate[1] next */
> -		minstrel_ht_set_rate(mp, mi, rates, i++, mi->max_tp_rate[1]);
> -	}
> +	/* Fill up remaining, keep one entry for max_probe_rate */
> +	for (; i < (mp->hw->max_rates - 1); i++)
> +		minstrel_ht_set_rate(mp, mi, rates, i, mi->max_tp_rate[i]);
>  
> -	if (mp->hw->max_rates >= 2) {
> +	if (i < mp->hw->max_rates)
>  		minstrel_ht_set_rate(mp, mi, rates, i++, mi->max_prob_rate);
> -	}
> +
> +	if (i < IEEE80211_TX_RATE_TABLE_SIZE)
> +		rates->rate[i].idx = -1;
>  
>  	mi->sta->max_rc_amsdu_len = minstrel_ht_get_max_amsdu_len(mi);
> -	rates->rate[i].idx = -1;
>  	rate_control_set_rates(mp->hw, mi->sta, rates);
>  }
>  
> -- 
> 2.35.1