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[06/10] mac80211: minstrel: reduce MINSTREL_SCALE

Message ID 20161214194703.33429-6-nbd@nbd.name (mailing list archive)
State Accepted
Delegated to: Johannes Berg
Headers show

Commit Message

Felix Fietkau Dec. 14, 2016, 7:46 p.m. UTC 
The loss of a bit of extra precision does not hurt the calculation, 12
bits is still enough to calculate probabilities well. Reducing the scale
makes it easier to avoid overflows

Signed-off-by: Felix Fietkau <nbd@nbd.name>
---
 net/mac80211/rc80211_minstrel.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
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Patch

diff --git a/net/mac80211/rc80211_minstrel.h b/net/mac80211/rc80211_minstrel.h
index 94b89b1..03716fd 100644
--- a/net/mac80211/rc80211_minstrel.h
+++ b/net/mac80211/rc80211_minstrel.h
@@ -14,7 +14,7 @@ 
 #define SAMPLE_COLUMNS	10	/* number of columns in sample table */
 
 /* scaled fraction values */
-#define MINSTREL_SCALE  16
+#define MINSTREL_SCALE  12
 #define MINSTREL_FRAC(val, div) (((val) << MINSTREL_SCALE) / div)
 #define MINSTREL_TRUNC(val) ((val) >> MINSTREL_SCALE)