netdev - Re: [PATCH] b43: Increase number of RX DMA slots

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Date:	Wed, 20 Feb 2013 09:15:38 +0100
From:	Bastian Bittorf <bittorf@...ebottle.com>
To:	Larry Finger <Larry.Finger@...inger.net>
Cc:	Gábor Stefanik <netrolller.3d@...il.com>,
	Julian Calaby <julian.calaby@...il.com>,
	David Miller <davem@...emloft.net>, David.Laight@...lab.com,
	linville@...driver.com, linux-wireless@...r.kernel.org,
	netdev@...r.kernel.org, bittorf@...ebottle.com,
	stable@...r.kernel.org, openwrt-devel@...ts.openwrt.org
Subject: Re: [PATCH] b43: Increase number of RX DMA slots

* Larry Finger <Larry.Finger@...inger.net> [20.02.2013 08:32]:
> On 02/20/2013 12:26 AM, Gábor Stefanik wrote:
> >
> >Is this an issue that vendor drivers are also vulnerable to? If it is
> >a firmware issue, I would certainly think so.
> 
> I also think so, at least if they are using the firmware version that
> Bastian is using. His logs don't have that info in them, but I
> certainly saw the problem on my BCM4312 using firmware 508.154 from
> 2009.
 
Another test this morning with heavy downloading (but tcp only)
show slot usage auf max 204/256. we are using firmware

"version 666.2 (2011-02-23 01:15:07)" which is OpenWrt's default
for b43. see here the full logs, including minstrel output and dmesg:

http://intercity-vpn.de/files/openwrt/b43test2.dmesg.txt

if a slot needs ~2500 bytes, so 256 slot are only 640kb which seems
ok to me. ofcourse it raises the memory consumption by 500kb, but now
the router is useful 8-)

thank you! bye, bastian

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