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From: Curt Howland on 20 Apr 2010 10:50
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Dear Debianistas,

I get the following messages continuously, via dmesg:

[10438.440147] wlan0: switched to long barker preamble
(BSSID=00:0c:41:fb:d5:50)
[10453.293891] wlan0: switched to short barker preamble
(BSSID=00:0c:41:fb:d5:50)
[10741.016287] wlan0: switched to long barker preamble
(BSSID=00:0c:41:fb:d5:50)
[10755.142445] wlan0: switched to short barker preamble
(BSSID=00:0c:41:fb:d5:50)
[11337.978637] wlan0: switched to long barker preamble
(BSSID=00:0c:41:fb:d5:50)
[11353.674135] wlan0: switched to short barker preamble
(BSSID=00:0c:41:fb:d5:50)
[11576.083088] wlan0: switched to long barker preamble
(BSSID=00:0c:41:fb:d5:50)

This happened with D-Link, Netgear and Linksys access points, so I
don't even know where to start. It very much interferes with network
speed due to what looks like constant renegotiation. And yes, it gets
worse with heavier traffic.

Suggestions?

Curt-

- --
Those who torment us for our own good will torment us without end,
for they do so with the approval of their consciences.
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From: green on 21 Apr 2010 09:50
Curt Howland wrote at 2010-04-20 09:27 -0500:
> I get the following messages continuously, via dmesg:
>
> [10438.440147] wlan0: switched to long barker preamble
> (BSSID=00:0c:41:fb:d5:50)
> [10453.293891] wlan0: switched to short barker preamble
> (BSSID=00:0c:41:fb:d5:50)
> [10741.016287] wlan0: switched to long barker preamble
> (BSSID=00:0c:41:fb:d5:50)
> [10755.142445] wlan0: switched to short barker preamble
> (BSSID=00:0c:41:fb:d5:50)
> [11337.978637] wlan0: switched to long barker preamble
> (BSSID=00:0c:41:fb:d5:50)
> [11353.674135] wlan0: switched to short barker preamble
> (BSSID=00:0c:41:fb:d5:50)
> [11576.083088] wlan0: switched to long barker preamble
> (BSSID=00:0c:41:fb:d5:50)

You should include more information:
- wireless hardware information
- applicable lspci output
- module in use
- debian version
- kernel version

Here an upgrade to 2.6.29 or later is suggested:
http://lxer.com/module/forums/t/30573/

If you are running lenny, you could try 2.6.30 from backports.
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