Re: Experiencing very slow browsing at times (atheros wireless)

["Sepherosa Ziehau" <sepherosa@xxxxxxxxx>]

On 5/24/07, Petr Janda <elekktretterr@exemail.com.au> wrote:
> Sepherosa Ziehau wrote:
> > Sepherosa Ziehau <sepherosa@gmail.com> added the comment:
> >
> > Does the "duplicate frame" log happen anytime?  If it does, then you
> > can give me a log at anytime.
> >
> >
> It happens everytime I try to browse websites, interestingly it seems
> not to happen when i ping those sites.
>
> http://www.punchyouremployer.com/files/dump80211.tgz (11mb)
>
> and these 2 contain the wlan debug messages with timestamps:
>
> http://www.punchyouremployer.com/files/messages.0.gz
>
> http://www.punchyouremployer.com/files/messages.tgz (note the tar)

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:
http://leaf.dragonflybsd.org/~sephe/skip_beacon.diff

Best Regards,
sephe

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