diff options
| author | Felix Fietkau <nbd@nbd.name> | 2018-10-06 20:35:02 +0300 |
|---|---|---|
| committer | Johannes Berg <johannes.berg@intel.com> | 2018-10-11 17:01:02 +0300 |
| commit | 202df504d7dea489ce74a913d4b529531bdff312 (patch) | |
| tree | 12a1008f6084ed86f5e944805b5b578d77874b8b /net/mac80211/rc80211_minstrel_ht_debugfs.c | |
| parent | b1c4f68337fa6b7c09154bb2bf2ec6f0d30ab652 (diff) | |
| download | linux-202df504d7dea489ce74a913d4b529531bdff312.tar.xz | |
mac80211: minstrel: reduce minstrel_mcs_groups size
By storing a shift value for all duration values of a group, we can
reduce precision by a neglegible amount to make it fit into a u16 value.
This improves cache footprint and reduces size:
Before:
text data bss dec hex filename
10024 116 0 10140 279c rc80211_minstrel_ht.o
After:
text data bss dec hex filename
9368 116 0 9484 250c rc80211_minstrel_ht.o
Signed-off-by: Felix Fietkau <nbd@nbd.name>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Diffstat (limited to 'net/mac80211/rc80211_minstrel_ht_debugfs.c')
| -rw-r--r-- | net/mac80211/rc80211_minstrel_ht_debugfs.c | 11 |
1 files changed, 9 insertions, 2 deletions
diff --git a/net/mac80211/rc80211_minstrel_ht_debugfs.c b/net/mac80211/rc80211_minstrel_ht_debugfs.c index 5db0f4228875..8065da2cf0f1 100644 --- a/net/mac80211/rc80211_minstrel_ht_debugfs.c +++ b/net/mac80211/rc80211_minstrel_ht_debugfs.c @@ -58,6 +58,7 @@ minstrel_ht_stats_dump(struct minstrel_ht_sta *mi, int i, char *p) static const int bitrates[4] = { 10, 20, 55, 110 }; int idx = i * MCS_GROUP_RATES + j; unsigned int prob_ewmsd; + unsigned int duration; if (!(mi->supported[i] & BIT(j))) continue; @@ -95,7 +96,9 @@ minstrel_ht_stats_dump(struct minstrel_ht_sta *mi, int i, char *p) p += sprintf(p, " %3u ", idx); /* tx_time[rate(i)] in usec */ - tx_time = DIV_ROUND_CLOSEST(mg->duration[j], 1000); + duration = mg->duration[j]; + duration <<= mg->shift; + tx_time = DIV_ROUND_CLOSEST(duration, 1000); p += sprintf(p, "%6u ", tx_time); tp_max = minstrel_ht_get_tp_avg(mi, i, j, MINSTREL_FRAC(100, 100)); @@ -204,6 +207,7 @@ minstrel_ht_stats_csv_dump(struct minstrel_ht_sta *mi, int i, char *p) static const int bitrates[4] = { 10, 20, 55, 110 }; int idx = i * MCS_GROUP_RATES + j; unsigned int prob_ewmsd; + unsigned int duration; if (!(mi->supported[i] & BIT(j))) continue; @@ -238,7 +242,10 @@ minstrel_ht_stats_csv_dump(struct minstrel_ht_sta *mi, int i, char *p) } p += sprintf(p, "%u,", idx); - tx_time = DIV_ROUND_CLOSEST(mg->duration[j], 1000); + + duration = mg->duration[j]; + duration <<= mg->shift; + tx_time = DIV_ROUND_CLOSEST(duration, 1000); p += sprintf(p, "%u,", tx_time); tp_max = minstrel_ht_get_tp_avg(mi, i, j, MINSTREL_FRAC(100, 100)); |