DragonFly bugs List (threaded) for 2007-05
DragonFly BSD
DragonFly bugs List (threaded) for 2007-05
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Re: Experiencing very slow browsing at times (atheros wireless)

From: Sten Daniel Soersdal <netslists@xxxxxxxxx>
Date: Sat, 26 May 2007 14:08:46 +0200

Petr Janda wrote:
Sepherosa Ziehau wrote:

Haha, the AP is broken. Its does not use single TX seq (as required by 802.11-1999 R2003, same as 802.11e for non-Qos data and bcast mgt) for data and mgt packets. Your AP seems to use one TX seq for beacon (99% of mgt packets) and another TX seq for data. That also explains why using lower rate will have better result: number of retries is reduced and duplication detection is performed only on retried packets.

Please test following patch and see whether it makes the situation
better in 11g mode:

Testing now, will let you know of success or failure within the next day or two. If this worked out to be the fix, I shall call you Sir Genius from now on :D


Hopefully that will fix it. I'm a little puzzled by the tcp conversations here. The remote server advertises an mss of 1420 (which indicates an MTU of 1440) but the packets you receive is of size 1452 (which translates to mss 1432) indicating that mss is adjusted along the way and that the path-mtu is lower than 1500. I'm not sure you're in the clear with fragmentation/mtu related problems yet, but a TX seq problem would definitely aggravate such a problem.

OTOH i might be misreading, misunderstanding or just plain stupid :)

Sten Daniel Soersdal

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