[Prism54-devel] [Bug 87] prism54 lost link with high traffic

[Edward Herr]

I've had similar problems using 1.0.4.3 transferring large files via NFS.  Both my laptop and my homebrew access point are using the prism54 snapshot from 6/28. Both radios are Xterasys XG-600 mini-pci. I am using 128-bit WEP.

The symptoms I see are:
1. After transferring approximately 60 megabytes of data with an average throughput of 1 MB/sec my laptop loses it's association with the AP. 

2. The laptop starts scanning and does not re-associate unless I do an ifdown/ifup on the AP interface (an ifdown/up on the laptop does nothing)

3. There are no error messages regarding the affected interfaces in log/messages or log/syslog on either the AP or client laptop. 

I downgraded firmware to 1.0.3.0 this morning and the problem has gone away.  I just transferred 629 MB (average file size is 8 MB) from my mp3 server to my laptop with no hiccups...  AND... the average throughput has gone up to 1.5 MB/sec.

More information below....
Cheers,
Ed  

Distribution: Debian unstable
Kernel (kernel.org) versions:
Access point: 2.6.7
Laptop: 2.6.7-bk18

iwconfig from Access Point
eth1      IEEE 802.11b/g  ESSID:"Rotwein"  
          Mode:Master  Channel:6  Access Point: 00:09:5B:69:51:D6  
          Bit Rate:54Mb/s   Sensitivity=20/200  
          Retry min limit:8   RTS thr:2347 B   Fragment thr:2346 B   
          Encryption key:xxxx-xxxx-xxxx-xxxx-xxxx-xxxx-xx   Security mode:restricted
          Link Quality:0  Signal level:0  Noise level:0
          Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
          Tx excessive retries:0  Invalid misc:0   Missed beacon:0


iwconfig from Laptop
eth1      IEEE 802.11b/g  ESSID:"Rotwein"  
          Mode:Managed  Channel:6  Access Point: 00:09:5B:69:51:D6  
          Bit Rate:48Mb/s   Sensitivity=20/200  
          Retry min limit:8   RTS thr:2347 B   Fragment thr:2346 B   
          Encryption key:xxxx-xxxx-xxxx-xxxx-xxxx-xxxx-xx   Security mode:restricted
          Link Quality=80/0  Signal level=-65 dBm  Noise level=-143 dBm
          Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
          Tx excessive retries:0  Invalid misc:0   Missed beacon:0




On Wed, 07 Jul 2004 15:55:49 +0200
"Harald Dunkel" <harald.dunkel at t-online.de> wrote:

> > ------- Additional Comments From thomas.herzog at gmx.li  2004-07-07 13:45 -------
> > Same here, but not with Prism54 in AP-Mode as Acess Point.
> > 
> 
> Have you tried to use an older version of the firmware?
> I had unreproducable lockups, too. After moving back from
> 1.0.4.3 to 1.0.3.0 the lockups were gone.
> 
> Regards
> 
> Harri
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