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Message-Id: <201005090602.o49621AA009766@www.freebsd.org>
Date: Sun, 9 May 2010 06:02:01 GMT
From: Erik Fonnesbeck <efonnes@gmail.com>
To: freebsd-gnats-submit@FreeBSD.org
Subject: mwl dropping all packets during and after high usage on 802.11n
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>Number:         146425
>Category:       kern
>Synopsis:       [mwl] mwl dropping all packets during and after high usage on 802.11n
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    freebsd-wireless
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:  
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Sun May 09 06:10:02 UTC 2010
>Closed-Date:    
>Last-Modified:  Mon Apr 30 06:02:45 UTC 2012
>Originator:     Erik Fonnesbeck
>Release:        8.0
>Organization:
>Environment:
FreeBSD bsd.local 8.0-RELEASE FreeBSD 8.0-RELEASE #0: Sat Nov 21 15:48:17 UTC 2009 root@almeida.cse.buffalo.edu:/usr/obj/usr/src/sys/GENERIC i386
>Description:
When using the card in 802.11n in access point mode, testing with file copying to or from a Windows system with an 802.11n card (specifically an Atheros 5416-based card in this card) with the other endpoint being accessed over 100 Mbps ethernet, after a short time it started to drop all packets, even after the transfer was stopped.  Before the packet loss, the transfer is typically far below 802.11g's fastest rate.
>How-To-Repeat:
Use mwl as 802.11n access point and copy a file over the network without a speed cap set.
>Fix:
If ampdu is disabled, the packet loss does not occur.  After that it can also at least reach, but not exceed, 802.11g rates.

>Release-Note:
>Audit-Trail:
Responsible-Changed-From-To: freebsd-bugs->freebsd-net 
Responsible-Changed-By: linimon 
Responsible-Changed-When: Mon May 10 04:17:06 UTC 2010 
Responsible-Changed-Why:  
Over to maintainer(s). 

http://www.freebsd.org/cgi/query-pr.cgi?pr=146425 
Responsible-Changed-From-To: freebsd-net->freebsd-wireless 
Responsible-Changed-By: adrian 
Responsible-Changed-When: Mon Apr 30 06:02:18 UTC 2012 
Responsible-Changed-Why:  
Switch over 


http://www.freebsd.org/cgi/query-pr.cgi?pr=146425 
>Unformatted:
