From: Felix Fietkau <nbd@openwrt.org>
Date: Sat, 16 Mar 2013 16:00:25 +0000 (+0100)
Subject: mac80211/minstrel_ht: improve rate selection stability
X-Git-Tag: omap-for-v3.10/dt-fixes-for-merge-window~65^2~170^2^2~118^2~7
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=3e8b1eb21c8b9806928000bf733e5762a64a7f72;p=pandora-kernel.git

mac80211/minstrel_ht: improve rate selection stability

Under load, otherwise stable rates can easily fluctuate because of
collisions. In my tests on a clean channel, the success probability of
the max throughput rate often stays somewhere between 90% and 100% under
load. This can cause some unnecessary switching to lower rates.
This patch improves stability by treating success probability values
between 90% and 100% the same.
In my tests on a 3x3 HT20 link with lots of TCP traffic, it improves the
average throughput by a few mbit/s.

Signed-off-by: Felix Fietkau <nbd@openwrt.org>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
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