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Commit 1109dc39 authored by Felix Fietkau's avatar Felix Fietkau Committed by Johannes Berg
Browse files

mac80211: minstrel: remove cur_prob from debugfs 



This field is redundant, because it is simply last success divided by
last attempt count. Removing it from the rate stats struct saves about
1.2 KiB per HT station.

Signed-off-by: default avatarFelix Fietkau <nbd@nbd.name>
Signed-off-by: default avatarJohannes Berg <johannes.berg@intel.com>
parent 95cd470c

net/mac80211/rc80211_minstrel.c

+6 −4
Original line number Diff line number Diff line
@@ -159,21 +159,23 @@ minstrel_update_rates(struct minstrel_priv *mp, struct minstrel_sta_info *mi) 
void

minstrel_calc_rate_stats(struct minstrel_rate_stats *mrs)

{

	unsigned int cur_prob;



	if (unlikely(mrs->attempts > 0)) {

		mrs->sample_skipped = 0;

		mrs->cur_prob = MINSTREL_FRAC(mrs->success, mrs->attempts);

		cur_prob = MINSTREL_FRAC(mrs->success, mrs->attempts);

		if (unlikely(!mrs->att_hist)) {

			mrs->prob_ewma = mrs->cur_prob;

			mrs->prob_ewma = cur_prob;

		} else {

			/* update exponential weighted moving variance */

			mrs->prob_ewmsd = minstrel_ewmsd(mrs->prob_ewmsd,

							 mrs->cur_prob,

							 cur_prob,

							 mrs->prob_ewma,

							 EWMA_LEVEL);



			/*update exponential weighted moving avarage */

			mrs->prob_ewma = minstrel_ewma(mrs->prob_ewma,

						       mrs->cur_prob,

						       cur_prob,

						       EWMA_LEVEL);

		}

		mrs->att_hist += mrs->attempts;

net/mac80211/rc80211_minstrel.h

+0 −2
Original line number Diff line number Diff line
@@ -62,10 +62,8 @@ struct minstrel_rate_stats { 
	u32 att_hist, succ_hist;



	/* statistis of packet delivery probability

	 *  cur_prob  - current prob within last update intervall

	 *  prob_ewma - exponential weighted moving average of prob

	 *  prob_ewmsd - exp. weighted moving standard deviation of prob */

	unsigned int cur_prob;

	unsigned int prob_ewma;

	u16 prob_ewmsd;

net/mac80211/rc80211_minstrel_debugfs.c

+6 −10
Original line number Diff line number Diff line
@@ -75,7 +75,7 @@ minstrel_stats_open(struct inode *inode, struct file *file) 
{

	struct minstrel_sta_info *mi = inode->i_private;

	struct minstrel_debugfs_info *ms;

	unsigned int i, tp_max, tp_avg, prob, eprob;

	unsigned int i, tp_max, tp_avg, eprob;

	char *p;



	ms = kmalloc(2048, GFP_KERNEL);
@@ -86,9 +86,9 @@ minstrel_stats_open(struct inode *inode, struct file *file) 
	p = ms->buf;

	p += sprintf(p, "\n");

	p += sprintf(p,

		     "best   __________rate_________    ________statistics________    ________last_______    ______sum-of________\n");

		     "best   __________rate_________    ________statistics________    ____last_____    ______sum-of________\n");

	p += sprintf(p,

		     "rate  [name idx airtime max_tp]  [avg(tp) avg(prob) sd(prob)]  [prob.|retry|suc|att]  [#success | #attempts]\n");

		     "rate  [name idx airtime max_tp]  [avg(tp) avg(prob) sd(prob)]  [retry|suc|att]  [#success | #attempts]\n");



	for (i = 0; i < mi->n_rates; i++) {

		struct minstrel_rate *mr = &mi->r[i];
@@ -107,17 +107,15 @@ minstrel_stats_open(struct inode *inode, struct file *file) 


		tp_max = minstrel_get_tp_avg(mr, MINSTREL_FRAC(100,100));

		tp_avg = minstrel_get_tp_avg(mr, mrs->prob_ewma);

		prob = MINSTREL_TRUNC(mrs->cur_prob * 1000);

		eprob = MINSTREL_TRUNC(mrs->prob_ewma * 1000);



		p += sprintf(p, "%4u.%1u    %4u.%1u     %3u.%1u    %3u.%1u"

				"     %3u.%1u %3u   %3u %-3u   "

				"     %3u   %3u %-3u   "

				"%9llu   %-9llu\n",

				tp_max / 10, tp_max % 10,

				tp_avg / 10, tp_avg % 10,

				eprob / 10, eprob % 10,

				mrs->prob_ewmsd / 10, mrs->prob_ewmsd % 10,

				prob / 10, prob % 10,

				mrs->retry_count,

				mrs->last_success,

				mrs->last_attempts,
@@ -148,7 +146,7 @@ minstrel_stats_csv_open(struct inode *inode, struct file *file) 
{

	struct minstrel_sta_info *mi = inode->i_private;

	struct minstrel_debugfs_info *ms;

	unsigned int i, tp_max, tp_avg, prob, eprob;

	unsigned int i, tp_max, tp_avg, eprob;

	char *p;



	ms = kmalloc(2048, GFP_KERNEL);
@@ -175,16 +173,14 @@ minstrel_stats_csv_open(struct inode *inode, struct file *file) 


		tp_max = minstrel_get_tp_avg(mr, MINSTREL_FRAC(100,100));

		tp_avg = minstrel_get_tp_avg(mr, mrs->prob_ewma);

		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.%u,%u,%u,%u,"

		p += sprintf(p, "%u.%u,%u.%u,%u.%u,%u.%u,%u,%u,%u,"

				"%llu,%llu,%d,%d\n",

				tp_max / 10, tp_max % 10,

				tp_avg / 10, tp_avg % 10,

				eprob / 10, eprob % 10,

				mrs->prob_ewmsd / 10, mrs->prob_ewmsd % 10,

				prob / 10, prob % 10,

				mrs->retry_count,

				mrs->last_success,

				mrs->last_attempts,

net/mac80211/rc80211_minstrel_ht_debugfs.c

+6 −10
Original line number Diff line number Diff line
@@ -19,7 +19,7 @@ static char * 
minstrel_ht_stats_dump(struct minstrel_ht_sta *mi, int i, char *p)

{

	const struct mcs_group *mg;

	unsigned int j, tp_max, tp_avg, prob, eprob, tx_time;

	unsigned int j, tp_max, tp_avg, eprob, tx_time;

	char htmode = '2';

	char gimode = 'L';

	u32 gflags;
@@ -83,17 +83,15 @@ minstrel_ht_stats_dump(struct minstrel_ht_sta *mi, int i, char *p) 


		tp_max = minstrel_ht_get_tp_avg(mi, i, j, MINSTREL_FRAC(100, 100));

		tp_avg = minstrel_ht_get_tp_avg(mi, i, j, mrs->prob_ewma);

		prob = MINSTREL_TRUNC(mrs->cur_prob * 1000);

		eprob = MINSTREL_TRUNC(mrs->prob_ewma * 1000);



		p += sprintf(p, "%4u.%1u    %4u.%1u     %3u.%1u    %3u.%1u"

				"     %3u.%1u %3u   %3u %-3u   "

				"     %3u   %3u %-3u   "

				"%9llu   %-9llu\n",

				tp_max / 10, tp_max % 10,

				tp_avg / 10, tp_avg % 10,

				eprob / 10, eprob % 10,

				mrs->prob_ewmsd / 10, mrs->prob_ewmsd % 10,

				prob / 10, prob % 10,

				mrs->retry_count,

				mrs->last_success,

				mrs->last_attempts,
@@ -130,9 +128,9 @@ minstrel_ht_stats_open(struct inode *inode, struct file *file) 


	p += sprintf(p, "\n");

	p += sprintf(p,

		     "              best   ____________rate__________    ________statistics________    ________last_______    ______sum-of________\n");

		     "              best   ____________rate__________    ________statistics________    _____last____    ______sum-of________\n");

	p += sprintf(p,

		     "mode guard #  rate  [name   idx airtime  max_tp]  [avg(tp) avg(prob) sd(prob)]  [prob.|retry|suc|att]  [#success | #attempts]\n");

		     "mode guard #  rate  [name   idx airtime  max_tp]  [avg(tp) avg(prob) sd(prob)]  [retry|suc|att]  [#success | #attempts]\n");



	p = minstrel_ht_stats_dump(mi, MINSTREL_CCK_GROUP, p);

	for (i = 0; i < MINSTREL_CCK_GROUP; i++)
@@ -165,7 +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_max, tp_avg, prob, eprob, tx_time;

	unsigned int j, tp_max, tp_avg, eprob, tx_time;

	char htmode = '2';

	char gimode = 'L';

	u32 gflags;
@@ -226,16 +224,14 @@ minstrel_ht_stats_csv_dump(struct minstrel_ht_sta *mi, int i, char *p) 


		tp_max = minstrel_ht_get_tp_avg(mi, i, j, MINSTREL_FRAC(100, 100));

		tp_avg = minstrel_ht_get_tp_avg(mi, i, j, mrs->prob_ewma);

		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.%u,%u,%u,"

		p += sprintf(p, "%u.%u,%u.%u,%u.%u,%u.%u,%u,%u,"

				"%u,%llu,%llu,",

				tp_max / 10, tp_max % 10,

				tp_avg / 10, tp_avg % 10,

				eprob / 10, eprob % 10,

				mrs->prob_ewmsd / 10, mrs->prob_ewmsd % 10,

				prob / 10, prob % 10,

				mrs->retry_count,

				mrs->last_success,

				mrs->last_attempts,