From: Felix Fietkau <nbd@openwrt.org>
Date: Thu, 16 Dec 2010 23:57:00 +0000 (+0100)
Subject: ath9k: fix queue depth check for forming new aggregates
X-Git-Tag: v2.6.38-rc1~476^2~104^2~4^2~12
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=4b3ba66a47311770b21e7aba481f4f2a90ba3084;p=pandora-kernel.git

ath9k: fix queue depth check for forming new aggregates

To improve aggregation length, there should not be more than two fully formed
A-MPDU frames in the hardware queue. To ensure this, the code checks the tx
queue length before forming new A-MPDUs. This can reduce the throughput (or
maybe even starve out A-MPDU traffic) when too many non-aggregated frames are
in the queue.
Fix this by keeping track of pending A-MPDU frames (even when they're sent out
as single frames), but exclude rate control probing frames to improve
performance.

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