Commit eea85999 authored by Karl Beldan's avatar Karl Beldan Committed by Johannes Berg

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: default avatarKarl Beldan <karl.beldan@rivierawaves.com>
Acked-by: default avatarFelix Fietkau <nbd@openwrt.org>
Signed-off-by: default avatarJohannes Berg <johannes.berg@intel.com>
parent e1c3b15d
......@@ -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;
}
......
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