package/kernel/mac80211/patches/339-mac80211-minstrel-reduce-MINSTREL_SCALE.patch

   1 From: Felix Fietkau <nbd@nbd.name>
   2 Date: Wed, 14 Dec 2016 20:15:33 +0100
   3 Subject: [PATCH] mac80211: minstrel: reduce MINSTREL_SCALE
   4
   5 The loss of a bit of extra precision does not hurt the calculation, 12
   6 bits is still enough to calculate probabilities well. Reducing the scale
   7 makes it easier to avoid overflows
   8
   9 Signed-off-by: Felix Fietkau <nbd@nbd.name>
  10 ---
  11
  12 --- a/net/mac80211/rc80211_minstrel.h
  13 +++ b/net/mac80211/rc80211_minstrel.h
  14 @@ -14,7 +14,7 @@
  15  #define SAMPLE_COLUMNS 10      /* number of columns in sample table */
  16
  17  /* scaled fraction values */
  18 -#define MINSTREL_SCALE  16
  19 +#define MINSTREL_SCALE  12
  20  #define MINSTREL_FRAC(val, div) (((val) << MINSTREL_SCALE) / div)
  21  #define MINSTREL_TRUNC(val) ((val) >> MINSTREL_SCALE)
  22