mirror of
https://github.com/FEX-Emu/linux.git
synced 2024-12-13 20:33:15 +00:00
mac80211: minstrel: store probability variance instead of standard deviation
This avoids the costly int_sqrt calls in the statistics update and moves it to the debugfs code instead. This also fixes an overflow in the previous standard deviation calculation. Signed-off-by: Thomas Huehn <thomas.huehn@evernet-eg.de> Signed-off-by: Felix Fietkau <nbd@nbd.name> Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Felix Fietkau
Johannes Berg
parent
0217eefa64
commit
4f0bc9c61b
@ -168,10 +168,10 @@ minstrel_calc_rate_stats(struct minstrel_rate_stats *mrs)
|
||||
mrs->prob_ewma = cur_prob;
|
||||
} else {
|
||||
/* update exponential weighted moving variance */
|
||||
mrs->prob_ewmsd = minstrel_ewmsd(mrs->prob_ewmsd,
|
||||
cur_prob,
|
||||
mrs->prob_ewma,
|
||||
EWMA_LEVEL);
|
||||
mrs->prob_ewmv = minstrel_ewmv(mrs->prob_ewmv,
|
||||
cur_prob,
|
||||
mrs->prob_ewma,
|
||||
EWMA_LEVEL);
|
||||
|
||||
/*update exponential weighted moving avarage */
|
||||
mrs->prob_ewma = minstrel_ewma(mrs->prob_ewma,
|
||||
|
||||
@ -36,21 +36,16 @@ minstrel_ewma(int old, int new, int weight)
|
||||
}
|
||||
|
||||
/*
|
||||
* Perform EWMSD (Exponentially Weighted Moving Standard Deviation) calculation
|
||||
* Perform EWMV (Exponentially Weighted Moving Variance) calculation
|
||||
*/
|
||||
static inline int
|
||||
minstrel_ewmsd(int old_ewmsd, int cur_prob, int prob_ewma, int weight)
|
||||
minstrel_ewmv(int old_ewmv, int cur_prob, int prob_ewma, int weight)
|
||||
{
|
||||
int diff, incr, tmp_var;
|
||||
int diff, incr;
|
||||
|
||||
/* calculate exponential weighted moving variance */
|
||||
diff = MINSTREL_TRUNC((cur_prob - prob_ewma) * 1000000);
|
||||
diff = cur_prob - prob_ewma;
|
||||
incr = (EWMA_DIV - weight) * diff / EWMA_DIV;
|
||||
tmp_var = old_ewmsd * old_ewmsd;
|
||||
tmp_var = weight * (tmp_var + diff * incr / 1000000) / EWMA_DIV;
|
||||
|
||||
/* return standard deviation */
|
||||
return (u16) int_sqrt(tmp_var);
|
||||
return weight * (old_ewmv + MINSTREL_TRUNC(diff * incr)) / EWMA_DIV;
|
||||
}
|
||||
|
||||
struct minstrel_rate_stats {
|
||||
@ -65,7 +60,7 @@ struct minstrel_rate_stats {
|
||||
* prob_ewma - exponential weighted moving average of prob
|
||||
* prob_ewmsd - exp. weighted moving standard deviation of prob */
|
||||
unsigned int prob_ewma;
|
||||
u16 prob_ewmsd;
|
||||
u16 prob_ewmv;
|
||||
|
||||
/* maximum retry counts */
|
||||
u8 retry_count;
|
||||
@ -151,6 +146,14 @@ struct minstrel_debugfs_info {
|
||||
char buf[];
|
||||
};
|
||||
|
||||
/* Get EWMSD (Exponentially Weighted Moving Standard Deviation) * 10 */
|
||||
static inline int
|
||||
minstrel_get_ewmsd10(struct minstrel_rate_stats *mrs)
|
||||
{
|
||||
unsigned int ewmv = mrs->prob_ewmv;
|
||||
return int_sqrt(MINSTREL_TRUNC(ewmv * 1000 * 1000));
|
||||
}
|
||||
|
||||
extern const struct rate_control_ops mac80211_minstrel;
|
||||
void minstrel_add_sta_debugfs(void *priv, void *priv_sta, struct dentry *dir);
|
||||
void minstrel_remove_sta_debugfs(void *priv, void *priv_sta);
|
||||
|
||||
@ -93,6 +93,7 @@ minstrel_stats_open(struct inode *inode, struct file *file)
|
||||
for (i = 0; i < mi->n_rates; i++) {
|
||||
struct minstrel_rate *mr = &mi->r[i];
|
||||
struct minstrel_rate_stats *mrs = &mi->r[i].stats;
|
||||
unsigned int prob_ewmsd;
|
||||
|
||||
*(p++) = (i == mi->max_tp_rate[0]) ? 'A' : ' ';
|
||||
*(p++) = (i == mi->max_tp_rate[1]) ? 'B' : ' ';
|
||||
@ -108,6 +109,7 @@ 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);
|
||||
eprob = MINSTREL_TRUNC(mrs->prob_ewma * 1000);
|
||||
prob_ewmsd = minstrel_get_ewmsd10(mrs);
|
||||
|
||||
p += sprintf(p, "%4u.%1u %4u.%1u %3u.%1u %3u.%1u"
|
||||
" %3u %3u %-3u "
|
||||
@ -115,7 +117,7 @@ minstrel_stats_open(struct inode *inode, struct file *file)
|
||||
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_ewmsd / 10, prob_ewmsd % 10,
|
||||
mrs->retry_count,
|
||||
mrs->last_success,
|
||||
mrs->last_attempts,
|
||||
@ -159,6 +161,7 @@ minstrel_stats_csv_open(struct inode *inode, struct file *file)
|
||||
for (i = 0; i < mi->n_rates; i++) {
|
||||
struct minstrel_rate *mr = &mi->r[i];
|
||||
struct minstrel_rate_stats *mrs = &mi->r[i].stats;
|
||||
unsigned int prob_ewmsd;
|
||||
|
||||
p += sprintf(p, "%s" ,((i == mi->max_tp_rate[0]) ? "A" : ""));
|
||||
p += sprintf(p, "%s" ,((i == mi->max_tp_rate[1]) ? "B" : ""));
|
||||
@ -174,13 +177,14 @@ 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);
|
||||
eprob = MINSTREL_TRUNC(mrs->prob_ewma * 1000);
|
||||
prob_ewmsd = minstrel_get_ewmsd10(mrs);
|
||||
|
||||
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_ewmsd / 10, prob_ewmsd % 10,
|
||||
mrs->retry_count,
|
||||
mrs->last_success,
|
||||
mrs->last_attempts,
|
||||
|
||||
@ -41,6 +41,7 @@ minstrel_ht_stats_dump(struct minstrel_ht_sta *mi, int i, char *p)
|
||||
struct minstrel_rate_stats *mrs = &mi->groups[i].rates[j];
|
||||
static const int bitrates[4] = { 10, 20, 55, 110 };
|
||||
int idx = i * MCS_GROUP_RATES + j;
|
||||
unsigned int prob_ewmsd;
|
||||
|
||||
if (!(mi->supported[i] & BIT(j)))
|
||||
continue;
|
||||
@ -84,6 +85,7 @@ 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);
|
||||
eprob = MINSTREL_TRUNC(mrs->prob_ewma * 1000);
|
||||
prob_ewmsd = minstrel_get_ewmsd10(mrs);
|
||||
|
||||
p += sprintf(p, "%4u.%1u %4u.%1u %3u.%1u %3u.%1u"
|
||||
" %3u %3u %-3u "
|
||||
@ -91,7 +93,7 @@ minstrel_ht_stats_dump(struct minstrel_ht_sta *mi, int i, char *p)
|
||||
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_ewmsd / 10, prob_ewmsd % 10,
|
||||
mrs->retry_count,
|
||||
mrs->last_success,
|
||||
mrs->last_attempts,
|
||||
@ -185,6 +187,7 @@ minstrel_ht_stats_csv_dump(struct minstrel_ht_sta *mi, int i, char *p)
|
||||
struct minstrel_rate_stats *mrs = &mi->groups[i].rates[j];
|
||||
static const int bitrates[4] = { 10, 20, 55, 110 };
|
||||
int idx = i * MCS_GROUP_RATES + j;
|
||||
unsigned int prob_ewmsd;
|
||||
|
||||
if (!(mi->supported[i] & BIT(j)))
|
||||
continue;
|
||||
@ -225,13 +228,14 @@ 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);
|
||||
eprob = MINSTREL_TRUNC(mrs->prob_ewma * 1000);
|
||||
prob_ewmsd = minstrel_get_ewmsd10(mrs);
|
||||
|
||||
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_ewmsd / 10, prob_ewmsd % 10,
|
||||
mrs->retry_count,
|
||||
mrs->last_success,
|
||||
mrs->last_attempts,
|
||||
|
||||
Loading…
Reference in New Issue
Block a user