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

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My test is very simple.

Continuous ping at about 10 ping per node per second.
Ping size 64 bytes


-----Original Message-----
From: Paul Stoaks [mailto:paul@xxxxxxxxxxxxxxxxxxx] 
Sent: Monday, December 03, 2012 1:22 PM
To: 'Georgiewskiy Yuriy'; Chaoxing Lin
Cc: linux-wireless@xxxxxxxxxxxxxxx
Subject: RE: help: 802.11s bad performance with 802.11n enabled

What kind of traffic are you pushing through (packet sizes?)  Are they fixed size, fixed rate, or ...?

Paul


-----Original Message-----
From: linux-wireless-owner@xxxxxxxxxxxxxxx
[mailto:linux-wireless-owner@xxxxxxxxxxxxxxx] On Behalf Of Georgiewskiy Yuriy
Sent: Monday, December 03, 2012 7:44 AM
To: Chaoxing Lin
Cc: linux-wireless@xxxxxxxxxxxxxxx
Subject: RE: help: 802.11s bad performance with 802.11n enabled

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 
CL>CL>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; 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
факс +7 4872 711143               fax +7 4872 711143
Компания ООО "Ай Ти Сервис"       IT Service Ltd
http://nkoort.ru                  http://nkoort.ru
JID: GHhost@xxxxxxxxxx            JID: GHhost@xxxxxxxxxx
YG129-RIPE                        YG129-RIPE

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