[ath9k-devel] WMM settings and AP performance

[Jeff Hansen <x@jeffhansen.com>]

Jouni Malinen wrote:
> On Tue, 2009-05-26 at 11:11 -0700, Jouni Malinen wrote:
>   
>> On Tue, 2009-05-26 at 10:46 -0700, Luis Rodriguez wrote:
>>     
>
>> That 25/30 Mbps to 2 Mbps is quite a huge difference and in order for
>> QoS parameters to cause something like this, they would need to be
>> seriously wrong..
>>     
>
> And well, it turns out that the values are indeed seriously wrong.. cw
> min and max values are swapped by
> b4af0b7ffa5f448bd12f81d2539ee2155919d493.
>
> Jeff: if you have a chance, you could try swapping the cw_max = aCWmin
> and cw_min = aCWmax value to actually set cw_max = aCWmax and cw_min =
> aCWmin.. In addition to this, I would actually recommend adding the
> explicit tx_queue_data* parameters into hostapd.conf even if you are not
> using WMM. This should work around the current bug and it will also set
> the parameters in a way which are more suitable for an AP (the defaults
> set in mac80211 are for station mode). In other words, add following
> into hostapd.conf:
>
> tx_queue_data3_aifs=7
> tx_queue_data3_cwmin=15
> tx_queue_data3_cwmax=1023
> tx_queue_data3_burst=0
>
> tx_queue_data2_aifs=3
> tx_queue_data2_cwmin=15
> tx_queue_data2_cwmax=63
> tx_queue_data2_burst=0
>
> tx_queue_data1_aifs=1
> tx_queue_data1_cwmin=7
> tx_queue_data1_cwmax=15
> tx_queue_data1_burst=3.0
>
> tx_queue_data0_aifs=1
> tx_queue_data0_cwmin=3
> tx_queue_data0_cwmax=7
> tx_queue_data0_burst=1.5
>   
That's good to know that the settings are separate for AP versus station
mode.  That's how Madwifi does it as well.  I was actually referring to
the case where I had a client in one of the LAN ports transmitting (it
was the iperf client, and my laptop, a wireless client, was the iperf
server), so indeed it was the AP transmitting.

I will try these settings later and let you know.

-Jeff

-- 
---------------------------------------------------
"If someone's gotta do it, it might as well be me."
                x at jeffhansen.com

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