Re: Poor RT2880 performance

[Florian Fainelli <florian@openwrt.org>]

Hello Stanislaw,

Le 02/16/12 14:00, Stanislaw Gruszka a écrit :
> On Mon, Feb 13, 2012 at 08:18:19PM +0100, Florian Fainelli wrote:
>> Le 02/13/12 14:45, Helmut Schaa a écrit :
>>> On Mon, Feb 13, 2012 at 2:23 PM, Florian Fainelli<florian@openwrt.org>   wrote:
>>>> I am playing with a RT2880-F based AP, with a N connected station, in a
>>>> residential environment.
>>> Mind to provide the RF and RT chipset identifications? rt2x00 should print them
>>> out during module load (at least when compiled with debugging options).
>> Sure, here are the HW infos of the AP:
>> Ralink RT2880   id:1 rev:1 running at 266.66 MHz
>> phy0 ->  rt2x00_set_chip: Info - Chipset detected - rt: 2860, rf:
>> 0001, rev: 0101.
> Did you try to revert commit (if you use kernel, which include it) ?
>
> commit f0425beda4d404a6e751439b562100b902ba9c98
> Author: Felix Fietkau<nbd@openwrt.org>
> Date:   Sun Aug 28 21:11:01 2011 +0200
>
>      mac80211: retry sending failed BAR frames later instead of tearing
>
> It was already identified that it couse performace issues on rt2860
> based APs.

Indeed, that seems to give me much better throughput, now I am around 
45Mbits/sec in HT20 and 64Mbits/sec in HT40+.

On a crowded channel, I could get 20Mbits/sec compared to the previous 
5Mbits/sec.

Do you know what could be the fix for RT2860 not to be impacted by this 
change or play nicely with it?

Thanks.
--
Florian