misc/140346: High bandwidth use causes loss of wlan connection

[Weongyo Jeong]

The following reply was made to PR misc/140346; it has been noted by GNATS.

From: Weongyo Jeong <weongyo.jeong at gmail.com>
To: Daniel Casner <dc at anybots.com>
Cc: freebsd-gnats-submit at freebsd.org
Subject: Re: misc/140346: High bandwidth use causes loss of wlan connection
Date: Sun, 8 Nov 2009 02:46:04 -0800

 On Fri, Nov 06, 2009 at 07:56:14PM +0000, Daniel Casner wrote:
 > 
 > >Number:         140346
 > >Category:       misc
 > >Synopsis:       High bandwidth use causes loss of wlan connection
 > >Confidential:   no
 > >Severity:       critical
 > >Priority:       high
 > >Responsible:    freebsd-bugs
 > >State:          open
 > >Quarter:        
 > >Keywords:       
 > >Date-Required:
 > >Class:          sw-bug
 > >Submitter-Id:   current-users
 > >Arrival-Date:   Fri Nov 06 20:00:04 UTC 2009
 > >Closed-Date:
 > >Last-Modified:
 > >Originator:     Daniel Casner
 > >Release:        8.0-BETA3
 > >Organization:
 > Anybots Inc.
 > >Environment:
 > 8.0-BETA3 FreeBSD 8.0-BETA3 #1: Mon Aug 31 08:58:35 PDT 2009     root at plutonium:/usr/obj/usr/src.RELENG_8/sys/GENERIC  i386
 > >Description:
 > I am using a rum wireless card (Asus WL-167g) wireless card and creating a wlan virtual device from it to connect to a wireless network. This same card worked flawlessly under FreeBSD 7.
 > 
 > The interface associates with wireless networks just fine, however, any time I try to push a large amount of data over the interface, such as writing a 100Mb file over NFS, the connection will die and not be restored.
 > 
 > Setting "wlandebug state+scan" it appears that the wlan device is performing background scans and re-associating correctly, however, the operating system does not resume sending packets over the interface. I can not ping from the wireless device or ping it from the out side after the connection dies.
 > >How-To-Repeat:
 > Set up a wireless connection, here is an example from my rc.conf
 > 
 > wlans_rum0="wlan0"
 > ifconfig_wlan0="ssid Anybots 10.10.10.27 netmask 255.255.255.0"
 > defaultrouter="10.10.10.20"
 > 
 > Mount an NFS partition, write a large file over NFS.
 > 
 > The connection is usually lost fairly quickly.
 > 
 > 
 > Running:
 > 
 > ifconfig wlan0 down
 > ifconfig wlan0 up scan
 > 
 > Usually restores the connection, however, continuing to try and push a large amount of bandwidth will cause it to die again.
 
 It looks it's a known issue and fixed at r198098.  Could you please test
 with it?
 
 regards,
 Weongyo Jeong