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| author | Felix Fietkau <nbd@openwrt.org> | 2008-10-15 19:13:59 +0200 |
|---|---|---|
| committer | John W. Linville <linville@tuxdriver.com> | 2008-10-31 19:00:36 -0400 |
| commit | f4a8cd94fc43829d065aae94f6d379c6f0f1301c (patch) | |
| tree | 19159beeca84268804a4ea33c80d695da64087ce /net | |
| parent | 0a9542ee12fb57d408f19aac738e8abe8670be7a (diff) | |
| download | linux-f4a8cd94fc43829d065aae94f6d379c6f0f1301c.tar.gz linux-f4a8cd94fc43829d065aae94f6d379c6f0f1301c.tar.bz2 linux-f4a8cd94fc43829d065aae94f6d379c6f0f1301c.zip | |
minstrel: improve performance for non-MRR drivers
This patch enhances minstrel's performance for non-MRR setups,
by preventing it from sampling slower rates with >95% success
probability and by putting at least 1 non-sample frame between
several sample frames.
Signed-off-by: Felix Fietkau <nbd@openwrt.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Diffstat (limited to 'net')
| -rw-r--r-- | net/mac80211/rc80211_minstrel.c | 29 | ||||
| -rw-r--r-- | net/mac80211/rc80211_minstrel.h | 2 |
2 files changed, 27 insertions, 4 deletions
diff --git a/net/mac80211/rc80211_minstrel.c b/net/mac80211/rc80211_minstrel.c index 759ddd8bf0f4..c10debc29ad6 100644 --- a/net/mac80211/rc80211_minstrel.c +++ b/net/mac80211/rc80211_minstrel.c @@ -126,7 +126,9 @@ minstrel_update_stats(struct minstrel_priv *mp, struct minstrel_sta_info *mi) mr->adjusted_retry_count = mr->retry_count >> 1; if (mr->adjusted_retry_count > 2) mr->adjusted_retry_count = 2; + mr->sample_limit = 4; } else { + mr->sample_limit = -1; mr->adjusted_retry_count = mr->retry_count; } if (!mr->adjusted_retry_count) @@ -265,7 +267,8 @@ minstrel_get_rate(void *priv, struct ieee80211_sta *sta, (mi->sample_count + mi->sample_deferred / 2); /* delta > 0: sampling required */ - if (delta > 0) { + if ((delta > 0) && (mrr || !mi->prev_sample)) { + struct minstrel_rate *msr; if (mi->packet_count >= 10000) { mi->sample_deferred = 0; mi->sample_count = 0; @@ -284,13 +287,20 @@ minstrel_get_rate(void *priv, struct ieee80211_sta *sta, } sample_ndx = minstrel_get_next_sample(mi); + msr = &mi->r[sample_ndx]; sample = true; - sample_slower = mrr && (mi->r[sample_ndx].perfect_tx_time > + sample_slower = mrr && (msr->perfect_tx_time > mi->r[ndx].perfect_tx_time); if (!sample_slower) { - ndx = sample_ndx; - mi->sample_count++; + if (msr->sample_limit != 0) { + ndx = sample_ndx; + mi->sample_count++; + if (msr->sample_limit > 0) + msr->sample_limit--; + } else { + sample = false; + } } else { /* Only use IEEE80211_TX_CTL_RATE_CTRL_PROBE to mark * packets that have the sampling rate deferred to the @@ -302,10 +312,20 @@ minstrel_get_rate(void *priv, struct ieee80211_sta *sta, mi->sample_deferred++; } } + mi->prev_sample = sample; + + /* If we're not using MRR and the sampling rate already + * has a probability of >95%, we shouldn't be attempting + * to use it, as this only wastes precious airtime */ + if (!mrr && sample && (mi->r[ndx].probability > 17100)) + ndx = mi->max_tp_rate; + ar[0].idx = mi->r[ndx].rix; ar[0].count = minstrel_get_retry_count(&mi->r[ndx], info); if (!mrr) { + if (!sample) + ar[0].count = mp->max_retry; ar[1].idx = mi->lowest_rix; ar[1].count = mp->max_retry; return; @@ -401,6 +421,7 @@ minstrel_rate_init(void *priv, struct ieee80211_supported_band *sband, /* calculate maximum number of retransmissions before * fallback (based on maximum segment size) */ + mr->sample_limit = -1; mr->retry_count = 1; mr->retry_count_cts = 1; mr->retry_count_rtscts = 1; diff --git a/net/mac80211/rc80211_minstrel.h b/net/mac80211/rc80211_minstrel.h index 9a90a6aee043..869fe0ef951d 100644 --- a/net/mac80211/rc80211_minstrel.h +++ b/net/mac80211/rc80211_minstrel.h @@ -16,6 +16,7 @@ struct minstrel_rate { unsigned int perfect_tx_time; unsigned int ack_time; + int sample_limit; unsigned int retry_count; unsigned int retry_count_cts; unsigned int retry_count_rtscts; @@ -57,6 +58,7 @@ struct minstrel_sta_info { int n_rates; struct minstrel_rate *r; + bool prev_sample; /* sampling table */ u8 *sample_table; |