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mac80211: restructure per-rate throughput calculation into function
This patch moves Minstrels and Minstrel-HTs per-rate throughput calculation (EWMA(thr)) into a dedicated function to be called. Therefore the variable "unsigned int cur_tp" within struct "minstrel_rate_stats" becomes obsolete. and is removed to free up its space. Signed-off-by: Thomas Huehn <thomas@net.t-labs.tu-berlin.de> Acked-by: Felix Fietkau <nbd@openwrt.org> Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
parent
9134073bc6
commit
6a27b2c40b
6 changed files with 88 additions and 61 deletions
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@ -69,14 +69,32 @@ rix_to_ndx(struct minstrel_sta_info *mi, int rix)
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return i;
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}
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/* return current EMWA throughput */
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int minstrel_get_tp_avg(struct minstrel_rate *mr)
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{
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int usecs;
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usecs = mr->perfect_tx_time;
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if (!usecs)
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usecs = 1000000;
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/* reset thr. below 10% success */
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if (mr->stats.prob_ewma < MINSTREL_FRAC(10, 100))
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return 0;
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else
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return MINSTREL_TRUNC(mr->stats.prob_ewma * (100000 / usecs));
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}
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/* find & sort topmost throughput rates */
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static inline void
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minstrel_sort_best_tp_rates(struct minstrel_sta_info *mi, int i, u8 *tp_list)
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{
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int j = MAX_THR_RATES;
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while (j > 0 && mi->r[i].stats.cur_tp > mi->r[tp_list[j - 1]].stats.cur_tp)
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while (j > 0 && (minstrel_get_tp_avg(&mi->r[i]) >
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minstrel_get_tp_avg(&mi->r[tp_list[j - 1]])))
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j--;
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if (j < MAX_THR_RATES - 1)
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memmove(&tp_list[j + 1], &tp_list[j], MAX_THR_RATES - (j + 1));
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if (j < MAX_THR_RATES)
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@ -158,8 +176,7 @@ minstrel_update_stats(struct minstrel_priv *mp, struct minstrel_sta_info *mi)
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{
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u8 tmp_tp_rate[MAX_THR_RATES];
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u8 tmp_prob_rate = 0;
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u32 usecs;
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int i;
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int i, tmp_cur_tp, tmp_prob_tp;
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for (i = 0; i < MAX_THR_RATES; i++)
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tmp_tp_rate[i] = 0;
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@ -168,19 +185,9 @@ minstrel_update_stats(struct minstrel_priv *mp, struct minstrel_sta_info *mi)
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struct minstrel_rate *mr = &mi->r[i];
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struct minstrel_rate_stats *mrs = &mi->r[i].stats;
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usecs = mr->perfect_tx_time;
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if (!usecs)
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usecs = 1000000;
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/* Update success probabilities per rate */
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minstrel_calc_rate_stats(mrs);
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/* Update throughput per rate, reset thr. below 10% success */
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if (mrs->prob_ewma < MINSTREL_FRAC(10, 100))
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mrs->cur_tp = 0;
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else
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mrs->cur_tp = mrs->prob_ewma * (1000000 / usecs);
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/* Sample less often below the 10% chance of success.
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* Sample less often above the 95% chance of success. */
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if (mrs->prob_ewma > MINSTREL_FRAC(95, 100) ||
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@ -205,7 +212,9 @@ minstrel_update_stats(struct minstrel_priv *mp, struct minstrel_sta_info *mi)
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* (2) if all success probabilities < 95%, the rate with
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* highest success probability is chosen as max_prob_rate */
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if (mrs->prob_ewma >= MINSTREL_FRAC(95, 100)) {
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if (mrs->cur_tp >= mi->r[tmp_prob_rate].stats.cur_tp)
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tmp_cur_tp = minstrel_get_tp_avg(mr);
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tmp_prob_tp = minstrel_get_tp_avg(&mi->r[tmp_prob_rate]);
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if (tmp_cur_tp >= tmp_prob_tp)
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tmp_prob_rate = i;
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} else {
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if (mrs->prob_ewma >= mi->r[tmp_prob_rate].stats.prob_ewma)
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@ -676,11 +685,15 @@ static u32 minstrel_get_expected_throughput(void *priv_sta)
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{
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struct minstrel_sta_info *mi = priv_sta;
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int idx = mi->max_tp_rate[0];
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int tmp_cur_tp;
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/* convert pkt per sec in kbps (1200 is the average pkt size used for
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* computing cur_tp
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*/
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return MINSTREL_TRUNC(mi->r[idx].stats.cur_tp) * 1200 * 8 / 1024;
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tmp_cur_tp = minstrel_get_tp_avg(&mi->r[idx]);
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tmp_cur_tp = tmp_cur_tp * 1200 * 8 / 1024;
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return tmp_cur_tp;
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}
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const struct rate_control_ops mac80211_minstrel = {
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@ -38,9 +38,6 @@ struct minstrel_rate_stats {
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/* total attempts/success counters */
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u64 att_hist, succ_hist;
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/* current EWMA of rate throughput */
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unsigned int cur_tp;
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/* statistis of packet delivery probability
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* cur_prob - current prob within last update intervall
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* prob_ewma - exponential weighted moving average of prob */
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@ -137,6 +134,7 @@ void minstrel_remove_sta_debugfs(void *priv, void *priv_sta);
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/* Recalculate success probabilities and counters for a given rate using EWMA */
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void minstrel_calc_rate_stats(struct minstrel_rate_stats *mrs);
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int minstrel_get_tp_avg(struct minstrel_rate *mr);
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/* debugfs */
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int minstrel_stats_open(struct inode *inode, struct file *file);
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@ -75,7 +75,7 @@ minstrel_stats_open(struct inode *inode, struct file *file)
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{
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struct minstrel_sta_info *mi = inode->i_private;
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struct minstrel_debugfs_info *ms;
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unsigned int i, tp, prob, eprob;
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unsigned int i, tp_avg, prob, eprob;
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char *p;
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ms = kmalloc(2048, GFP_KERNEL);
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@ -105,13 +105,13 @@ minstrel_stats_open(struct inode *inode, struct file *file)
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p += sprintf(p, "%3u ", i);
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p += sprintf(p, "%6u ", mr->perfect_tx_time);
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tp = MINSTREL_TRUNC(mrs->cur_tp / 10);
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tp_avg = minstrel_get_tp_avg(mr);
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prob = MINSTREL_TRUNC(mrs->cur_prob * 1000);
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eprob = MINSTREL_TRUNC(mrs->prob_ewma * 1000);
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p += sprintf(p, " %4u.%1u %3u.%1u %3u.%1u %3u"
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" %3u %-3u %9llu %-9llu\n",
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tp / 10, tp % 10,
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tp_avg / 10, tp_avg % 10,
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eprob / 10, eprob % 10,
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prob / 10, prob % 10,
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mrs->retry_count,
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@ -144,7 +144,7 @@ minstrel_stats_csv_open(struct inode *inode, struct file *file)
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{
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struct minstrel_sta_info *mi = inode->i_private;
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struct minstrel_debugfs_info *ms;
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unsigned int i, tp, prob, eprob;
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unsigned int i, tp_avg, prob, eprob;
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char *p;
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ms = kmalloc(2048, GFP_KERNEL);
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@ -169,13 +169,13 @@ minstrel_stats_csv_open(struct inode *inode, struct file *file)
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p += sprintf(p, "%u,", i);
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p += sprintf(p, "%u,",mr->perfect_tx_time);
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tp = MINSTREL_TRUNC(mrs->cur_tp / 10);
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tp_avg = minstrel_get_tp_avg(mr);
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prob = MINSTREL_TRUNC(mrs->cur_prob * 1000);
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eprob = MINSTREL_TRUNC(mrs->prob_ewma * 1000);
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p += sprintf(p, "%u.%u,%u.%u,%u.%u,%u,%u,%u,"
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"%llu,%llu,%d,%d\n",
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tp / 10, tp % 10,
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tp_avg / 10, tp_avg % 10,
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eprob / 10, eprob % 10,
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prob / 10, prob % 10,
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mrs->retry_count,
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@ -314,11 +314,11 @@ minstrel_get_ratestats(struct minstrel_ht_sta *mi, int index)
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}
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/*
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* Calculate throughput based on the average A-MPDU length, taking into account
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* the expected number of retransmissions and their expected length
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* Return current throughput based on the average A-MPDU length, taking into
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* account the expected number of retransmissions and their expected length
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*/
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static void
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minstrel_ht_calc_tp(struct minstrel_ht_sta *mi, int group, int rate)
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int
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minstrel_ht_get_tp_avg(struct minstrel_ht_sta *mi, int group, int rate)
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{
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struct minstrel_rate_stats *mrs;
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unsigned int nsecs = 0;
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@ -328,10 +328,8 @@ minstrel_ht_calc_tp(struct minstrel_ht_sta *mi, int group, int rate)
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tmp_prob_ewma = mrs->prob_ewma;
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/* do not account throughput if sucess prob is below 10% */
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if (mrs->prob_ewma < MINSTREL_FRAC(10, 100)) {
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mrs->cur_tp = 0;
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return;
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}
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if (mrs->prob_ewma < MINSTREL_FRAC(10, 100))
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return 0;
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/*
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* For the throughput calculation, limit the probability value to 90% to
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@ -346,7 +344,7 @@ minstrel_ht_calc_tp(struct minstrel_ht_sta *mi, int group, int rate)
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nsecs += minstrel_mcs_groups[group].duration[rate];
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/* prob is scaled - see MINSTREL_FRAC above */
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mrs->cur_tp = MINSTREL_TRUNC(1000000 * ((tmp_prob_ewma * 1000) / nsecs));
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return MINSTREL_TRUNC(100000 * ((tmp_prob_ewma * 1000) / nsecs));
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}
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/*
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@ -360,22 +358,22 @@ static void
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minstrel_ht_sort_best_tp_rates(struct minstrel_ht_sta *mi, u16 index,
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u16 *tp_list)
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{
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int cur_group, cur_idx, cur_thr, cur_prob;
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int tmp_group, tmp_idx, tmp_thr, tmp_prob;
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int cur_group, cur_idx, cur_tp_avg, cur_prob;
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int tmp_group, tmp_idx, tmp_tp_avg, tmp_prob;
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int j = MAX_THR_RATES;
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cur_group = index / MCS_GROUP_RATES;
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cur_idx = index % MCS_GROUP_RATES;
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cur_thr = mi->groups[cur_group].rates[cur_idx].cur_tp;
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cur_tp_avg = minstrel_ht_get_tp_avg(mi, cur_group, cur_idx);
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cur_prob = mi->groups[cur_group].rates[cur_idx].prob_ewma;
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do {
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tmp_group = tp_list[j - 1] / MCS_GROUP_RATES;
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tmp_idx = tp_list[j - 1] % MCS_GROUP_RATES;
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tmp_thr = mi->groups[tmp_group].rates[tmp_idx].cur_tp;
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tmp_tp_avg = minstrel_ht_get_tp_avg(mi, tmp_group, tmp_idx);
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tmp_prob = mi->groups[tmp_group].rates[tmp_idx].prob_ewma;
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if (cur_thr < tmp_thr ||
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(cur_thr == tmp_thr && cur_prob <= tmp_prob))
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if (cur_tp_avg < tmp_tp_avg ||
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(cur_tp_avg == tmp_tp_avg && cur_prob <= tmp_prob))
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break;
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j--;
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} while (j > 0);
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@ -396,14 +394,19 @@ minstrel_ht_set_best_prob_rate(struct minstrel_ht_sta *mi, u16 index)
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{
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struct minstrel_mcs_group_data *mg;
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struct minstrel_rate_stats *mrs;
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int tmp_group, tmp_idx, tmp_tp, tmp_prob, max_tp_group;
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int tmp_group, tmp_idx, tmp_tp_avg, tmp_prob;
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int max_tp_group, cur_tp_avg, cur_group, cur_idx;
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int max_group_prob_rate_group, max_group_prob_rate_idx;
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int max_group_prob_rate_tp_avg;
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cur_group = index / MCS_GROUP_RATES;
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cur_idx = index % MCS_GROUP_RATES;
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mg = &mi->groups[index / MCS_GROUP_RATES];
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mrs = &mg->rates[index % MCS_GROUP_RATES];
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tmp_group = mi->max_prob_rate / MCS_GROUP_RATES;
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tmp_idx = mi->max_prob_rate % MCS_GROUP_RATES;
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tmp_tp = mi->groups[tmp_group].rates[tmp_idx].cur_tp;
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tmp_tp_avg = minstrel_ht_get_tp_avg(mi, tmp_group, tmp_idx);
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tmp_prob = mi->groups[tmp_group].rates[tmp_idx].prob_ewma;
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/* if max_tp_rate[0] is from MCS_GROUP max_prob_rate get selected from
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@ -414,9 +417,18 @@ minstrel_ht_set_best_prob_rate(struct minstrel_ht_sta *mi, u16 index)
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return;
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if (mrs->prob_ewma > MINSTREL_FRAC(75, 100)) {
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if (mrs->cur_tp > tmp_tp)
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cur_tp_avg = minstrel_ht_get_tp_avg(mi, cur_group, cur_idx);
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if (cur_tp_avg > tmp_tp_avg)
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mi->max_prob_rate = index;
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if (mrs->cur_tp > mg->rates[mg->max_group_prob_rate].cur_tp)
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max_group_prob_rate_group = mg->max_group_prob_rate /
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MCS_GROUP_RATES;
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max_group_prob_rate_idx = mg->max_group_prob_rate %
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MCS_GROUP_RATES;
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max_group_prob_rate_tp_avg = minstrel_ht_get_tp_avg(mi,
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max_group_prob_rate_group,
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max_group_prob_rate_idx);
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if (cur_tp_avg > max_group_prob_rate_tp_avg)
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mg->max_group_prob_rate = index;
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} else {
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if (mrs->prob_ewma > tmp_prob)
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@ -443,11 +455,11 @@ minstrel_ht_assign_best_tp_rates(struct minstrel_ht_sta *mi,
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tmp_group = tmp_cck_tp_rate[0] / MCS_GROUP_RATES;
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tmp_idx = tmp_cck_tp_rate[0] % MCS_GROUP_RATES;
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tmp_cck_tp = mi->groups[tmp_group].rates[tmp_idx].cur_tp;
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tmp_cck_tp = minstrel_ht_get_tp_avg(mi, tmp_group, tmp_idx);
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tmp_group = tmp_mcs_tp_rate[0] / MCS_GROUP_RATES;
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tmp_idx = tmp_mcs_tp_rate[0] % MCS_GROUP_RATES;
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tmp_mcs_tp = mi->groups[tmp_group].rates[tmp_idx].cur_tp;
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tmp_mcs_tp = minstrel_ht_get_tp_avg(mi, tmp_group, tmp_idx);
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if (tmp_cck_tp > tmp_mcs_tp) {
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for(i = 0; i < MAX_THR_RATES; i++) {
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@ -466,8 +478,7 @@ static inline void
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minstrel_ht_prob_rate_reduce_streams(struct minstrel_ht_sta *mi)
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{
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struct minstrel_mcs_group_data *mg;
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struct minstrel_rate_stats *mrs;
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int tmp_max_streams, group;
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int tmp_max_streams, group, tmp_idx;
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int tmp_tp = 0;
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tmp_max_streams = minstrel_mcs_groups[mi->max_tp_rate[0] /
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@ -476,11 +487,14 @@ minstrel_ht_prob_rate_reduce_streams(struct minstrel_ht_sta *mi)
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mg = &mi->groups[group];
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if (!mg->supported || group == MINSTREL_CCK_GROUP)
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continue;
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mrs = minstrel_get_ratestats(mi, mg->max_group_prob_rate);
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if (tmp_tp < mrs->cur_tp &&
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tmp_idx = mg->max_group_prob_rate % MCS_GROUP_RATES;
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if (tmp_tp < minstrel_ht_get_tp_avg(mi, group, tmp_idx) &&
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(minstrel_mcs_groups[group].streams < tmp_max_streams)) {
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mi->max_prob_rate = mg->max_group_prob_rate;
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tmp_tp = mrs->cur_tp;
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tmp_tp = minstrel_ht_get_tp_avg(mi, group,
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tmp_idx);
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}
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}
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}
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@ -541,9 +555,8 @@ minstrel_ht_update_stats(struct minstrel_priv *mp, struct minstrel_ht_sta *mi)
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mrs = &mg->rates[i];
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mrs->retry_updated = false;
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minstrel_calc_rate_stats(mrs);
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minstrel_ht_calc_tp(mi, group, i);
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if (!mrs->cur_tp)
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if (minstrel_ht_get_tp_avg(mi, group, i) == 0)
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continue;
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/* Find max throughput rate set */
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@ -1302,7 +1315,7 @@ static u32 minstrel_ht_get_expected_throughput(void *priv_sta)
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{
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struct minstrel_ht_sta_priv *msp = priv_sta;
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struct minstrel_ht_sta *mi = &msp->ht;
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int i, j;
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int i, j, tp_avg;
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if (!msp->is_ht)
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return mac80211_minstrel.get_expected_throughput(priv_sta);
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@ -1310,8 +1323,10 @@ static u32 minstrel_ht_get_expected_throughput(void *priv_sta)
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i = mi->max_tp_rate[0] / MCS_GROUP_RATES;
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j = mi->max_tp_rate[0] % MCS_GROUP_RATES;
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/* convert cur_tp from pkt per second in kbps */
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return mi->groups[i].rates[j].cur_tp * AVG_PKT_SIZE * 8 / 1024;
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/* convert tp_avg from pkt per second in kbps */
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tp_avg = minstrel_ht_get_tp_avg(mi, i, j) * AVG_PKT_SIZE * 8 / 1024;
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return tp_avg;
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}
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static const struct rate_control_ops mac80211_minstrel_ht = {
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@ -121,5 +121,6 @@ struct minstrel_ht_sta_priv {
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void minstrel_ht_add_sta_debugfs(void *priv, void *priv_sta, struct dentry *dir);
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void minstrel_ht_remove_sta_debugfs(void *priv, void *priv_sta);
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int minstrel_ht_get_tp_avg(struct minstrel_ht_sta *mi, int group, int rate);
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#endif
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@ -19,7 +19,7 @@ static char *
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minstrel_ht_stats_dump(struct minstrel_ht_sta *mi, int i, char *p)
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{
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const struct mcs_group *mg;
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unsigned int j, tp, prob, eprob, tx_time;
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||||
unsigned int j, tp_avg, prob, eprob, tx_time;
|
||||
char htmode = '2';
|
||||
char gimode = 'L';
|
||||
u32 gflags;
|
||||
|
@ -81,13 +81,13 @@ minstrel_ht_stats_dump(struct minstrel_ht_sta *mi, int i, char *p)
|
|||
tx_time = DIV_ROUND_CLOSEST(mg->duration[j], 1000);
|
||||
p += sprintf(p, "%6u ", tx_time);
|
||||
|
||||
tp = mrs->cur_tp / 10;
|
||||
tp_avg = minstrel_ht_get_tp_avg(mi, i, j);
|
||||
prob = MINSTREL_TRUNC(mrs->cur_prob * 1000);
|
||||
eprob = MINSTREL_TRUNC(mrs->prob_ewma * 1000);
|
||||
|
||||
p += sprintf(p, "%4u.%1u %3u.%1u %3u.%1u "
|
||||
"%3u %3u %-3u %9llu %-9llu\n",
|
||||
tp / 10, tp % 10,
|
||||
tp_avg / 10, tp_avg % 10,
|
||||
eprob / 10, eprob % 10,
|
||||
prob / 10, prob % 10,
|
||||
mrs->retry_count,
|
||||
|
@ -163,7 +163,7 @@ static char *
|
|||
minstrel_ht_stats_csv_dump(struct minstrel_ht_sta *mi, int i, char *p)
|
||||
{
|
||||
const struct mcs_group *mg;
|
||||
unsigned int j, tp, prob, eprob, tx_time;
|
||||
unsigned int j, tp_avg, prob, eprob, tx_time;
|
||||
char htmode = '2';
|
||||
char gimode = 'L';
|
||||
u32 gflags;
|
||||
|
@ -222,12 +222,12 @@ minstrel_ht_stats_csv_dump(struct minstrel_ht_sta *mi, int i, char *p)
|
|||
tx_time = DIV_ROUND_CLOSEST(mg->duration[j], 1000);
|
||||
p += sprintf(p, "%u,", tx_time);
|
||||
|
||||
tp = mrs->cur_tp / 10;
|
||||
tp_avg = minstrel_ht_get_tp_avg(mi, i, j);
|
||||
prob = MINSTREL_TRUNC(mrs->cur_prob * 1000);
|
||||
eprob = MINSTREL_TRUNC(mrs->prob_ewma * 1000);
|
||||
|
||||
p += sprintf(p, "%u.%u,%u.%u,%u.%u,%u,%u,%u,%llu,%llu,",
|
||||
tp / 10, tp % 10,
|
||||
tp_avg / 10, tp_avg % 10,
|
||||
eprob / 10, eprob % 10,
|
||||
prob / 10, prob % 10,
|
||||
mrs->retry_count,
|
||||
|
|
Loading…
Reference in a new issue