From mboxrd@z Thu Jan  1 00:00:00 1970
From: Felix Fietkau <nbd@openwrt.org>
Date: Fri, 29 Apr 2011 13:20:35 +0200
Subject: [ath9k-devel] [PATCH/RFC] ath9k PER/ratecontrol
In-Reply-To: <1303983401-28884-1-git-send-email-andreas.hofmann@corscience.de>
References: <1303983401-28884-1-git-send-email-andreas.hofmann@corscience.de>
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To: ath9k-devel@lists.ath9k.org

On 2011-04-28 11:36 AM, Andreas Hofmann wrote:
>
> Hello folks,
>
> I am currently running wireless video transmissions over RTP, using 2
> embedded linux devices with kernel 2.6.37 and AR9280 wireless-cards. The
> link was not reliable enough and I found out that a small change to the
> ratecontrol-algorithm improves the situation. Now I want to notice other
> people, who might have the same problem and request for comments on
> that change.
>
> I noticed that the connection was rather error-prone, when the slightest
> change to the wireless-channel was made (e.g. waving around in the area
> around the antennas) picture errors were becoming visible. Also tests
> with iperf over UDP confirmed that the PER on the wireless link was
> quite high (sometimes over 3%).
You could try using minstrel_ht instead of the ath9k rate control. 
People have told me that it produces much lower PER, it might help for 
both performance and reliability of your video transmission.

- Felix