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