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| author | Karl Beldan <karl.beldan@rivierawaves.com> | 2013-04-17 13:43:22 +0200 |
|---|---|---|
| committer | Johannes Berg <johannes.berg@intel.com> | 2013-04-17 17:08:49 +0200 |
| commit | eea85999eca4d7f3528010cd8277392cd56ba713 (patch) | |
| tree | ca7ab112a1767ce31a3d6ea5ac9e7c82a4db9343 | |
| parent | e1c3b15dd33a7d990188fa5b4731c78f8ba416a4 (diff) | |
| download | lwn-eea85999eca4d7f3528010cd8277392cd56ba713.tar.gz lwn-eea85999eca4d7f3528010cd8277392cd56ba713.zip | |
mac80211: optimize minstrel_ewma
Use powers of two in ewma of minstrel.
This changes :
- EWMA_DIV from 100 to 2^7
- EWMA_LEVEL from 75 (/EWMA_DIV=100) to 2^6 + 2^5 (/EWMA_DIV=128)
Note that this changes EWMA_DIV - EWMA_LEVEL from 25 to 2^5 and keeps
EWMA_LEVEL / EWMA_DIV == 0.75.
Signed-off-by: Karl Beldan <karl.beldan@rivierawaves.com>
Acked-by: Felix Fietkau <nbd@openwrt.org>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
| -rw-r--r-- | net/mac80211/rc80211_minstrel.h | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/net/mac80211/rc80211_minstrel.h b/net/mac80211/rc80211_minstrel.h index 85ebf42cb46d..b9f8535fa15c 100644 --- a/net/mac80211/rc80211_minstrel.h +++ b/net/mac80211/rc80211_minstrel.h @@ -9,7 +9,8 @@ #ifndef __RC_MINSTREL_H #define __RC_MINSTREL_H -#define EWMA_LEVEL 75 /* ewma weighting factor [%] */ +#define EWMA_LEVEL 96 /* ewma weighting factor [/EWMA_DIV] */ +#define EWMA_DIV 128 #define SAMPLE_COLUMNS 10 /* number of columns in sample table */ @@ -27,7 +28,7 @@ static inline int minstrel_ewma(int old, int new, int weight) { - return (new * (100 - weight) + old * weight) / 100; + return (new * (EWMA_DIV - weight) + old * weight) / EWMA_DIV; } |