From: Felix Fietkau <nbd@openwrt.org>
Date: Sun, 18 Mar 2012 21:58:06 +0000 (+0100)
Subject: mac80211: optimize aggregation session timeout handling
X-Git-Tag: v3.5-rc1~109^2~487^2^2~82
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=12d3952fc4a1cd96234bc7023bf7eefeb0bb6355;p=pandora-kernel.git

mac80211: optimize aggregation session timeout handling

Calling mod_timer from the rx/tx hotpath is somewhat expensive, and the
timeout doesn't need to be so precise.

Switch to a different strategy: Schedule the timer initially, store jiffies
of all last rx/tx activity which would previously modify the timer, and
let the timer re-arm itself after checking the last rx/tx timestamp.
Make the session timers deferrable to avoid causing extra wakeups on systems
running on battery.
This visibly reduces CPU load under high network load on small embedded
systems.

Signed-off-by: Felix Fietkau <nbd@openwrt.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
---

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