ath hostap - long delays between wifi clients via ath AP

[Sam Leffler]

Johann Hugo wrote:
> Hi
> 
> I've been playing with ath hostap mode today when I noticed someting very 
> strange. Ping delays are very high (100 - 200ms) between two wifi clients 
> connected to the same ath hostap AP, but if I ping the hostap AP itself, the 
> delays are fine (1.7ms - 11b mode).
> 
> Here is my setup:
> 
> client 1 ------------ ath hostap AP ------------- client 2
> 
> I have tried various configs and combinations, all with the same result:
> - hostap in 11g mode
> - hostap in 11b mode
> - ath clients
> - wi (lucent) clients
> - hostap with 5.3-BETA6 , HAL 0.9.6.3
> - hostap with 5.3-BETA7 , HAL 0.9.6.3
> - hostap with 5.3-BETA4 , HAL 0.9.11.6 , net80211+ath-20040818.patch
> - Senao 5354 minipci with atheros 5212
> - Dlink DWL-AG520 with atheros 5212
> - hostap with wi (Intersil - actiontec minipci) - works fine, no problem
> 
> If I add another subnet (alias) to the ath interface and I route between the 
> clients then it works fine. The problem is only between clients on the same 
> subnet working through an ath hostap AP. Is bridging done inside the HAL ?
> 
> Are there any one else using an ath hostap AP that can do a ping test between 
> two clients to see if they get the same results.

Packets between wireless clients are bridged entirely in the net80211 
layer and should have less overhead than going through the bridge.  You 
are likely seeing tx retransmits related to the incorrect 11g 
implementation in -current.  Try running a 3rd station to sniff the traffic.

	Sam