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RE: help: 802.11s bad performance with 802.11n enabled

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On 2012-12-03 14:56 -0000, Chaoxing Lin wrote Georgiewskiy Yuriy:

CL>CL>For experiment, I changed ath9k driver to disable 802.11n packet aggregation. The network becomes much better.
CL>CL>It's as stable as running 802.11a only mode.
CL>CL>So it seems that the aggregation plays a big role in in-stability of 802.11s network with 802.11n.
CL>CL>Any one has any idea why?
CL>
CL>Can you post a patch? i want test this too.
CL>
CL>The change is easy
CL>In ath9k/init.c
CL>Function ath9k_set_hw_capab()
CL>Replace below
CL>    if (sc->sc_ah->caps.hw_caps & ATH9K_HW_CAP_HT)
CL>         hw->flags |= IEEE80211_HW_AMPDU_AGGREGATION;
CL>with
CL>	hw->flags &= ~IEEE80211_HW_AMPDU_AGGREGATION; 

On first look in my case disabled aggregation reduces packet loss, 
link is more reliable, but it's also drop throughput to 15-20 Mbits/sec
from about ~50 with aggregation enabled.

C уважением                       With Best Regards
Георгиевский Юрий.                Georgiewskiy Yuriy
+7 4872 711666                    +7 4872 711666
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Компания ООО "Ай Ти Сервис"       IT Service Ltd
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YG129-RIPE                        YG129-RIPE

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