mac80211: optimize minstrel_ewma

[cascardo/linux.git] / net / mac80211 / rc80211_minstrel.h

diff --git a/net/mac80211/rc80211_minstrel.h b/net/mac80211/rc80211_minstrel.h
index 85ebf42..b9f8535 100644 (file)
--- 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;
 }