linux-kernel - Re: [PATCH 3/3] net: wireless: bcm43xx: big_buffer

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Message-ID: <47633BAE.6040604@lwfinger.net>
Date:	Fri, 14 Dec 2007 18:27:58 -0800
From:	Larry Finger <larry.finger@...inger.net>
To:	mvtodevnull@...il.com
CC:	"Rafael J. Wysocki" <rjw@...k.pl>, Michael Buesch <mb@...sch.de>,
	Daniel Walker <dwalker@...sta.com>,
	Ray Lee <ray-lk@...rabbit.org>,
	Simon Holm Thøgersen 
	<odie@...aau.dk>, matthias.kaehlcke@...il.com,
	linux-kernel@...r.kernel.org, linux@...mer.net,
	Ingo Molnar <mingo@...e.hu>, kjwinchester@...il.com,
	jonathan@...masters.org, akpm@...ux-foundation.org,
	bcm43xx-dev@...ts.berlios.de
Subject: Re: [PATCH 3/3] net: wireless: bcm43xx: big_buffer_sem semaphore
 to mutex

mvtodevnull@...il.com wrote:
> 
> Could this be the reason my BCM94311MCG rev 1 receives such terrible
> performance with b43 but works well with bcm43xx? The device is
> 802.11b/g but my router is 802.11b. I filed a report on this issue
> here: https://bugzilla.redhat.com/show_bug.cgi?id=413291

No. On my BCM4311/1, my transfer rate peaked at about 12 Mbs with bcm43xx, but increased to 20 Mbs 
with b43. These tests were done with iperf with a server running running on a second computer 
connected by wire to my router. These rates are for 802.11g. When my interface was locked at 11 Mbs, 
the transfer rate was the expected 5.3-5.5 Mbs with both drivers.

> I was told by Michael that I would have to fix it myself, and I am
> trying, but the learning curve is a little steep. If this is relevant,
> I might at least have some direction to go in.

I suspect that mac80211 is doing something that your router does not like. Do you have any chance to 
capture the traffic between your computer and the router by using a second wireless computer running 
kismet or wireshark? A look at the differences between b43 and bcm43xx should show the reason.

Larry

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