Re: Optimization of Linksys WRT54G/WRT54GS DD-WRT ethernet driver- Broadcom BCM4712

[John W. Linville]

On Sat, Jan 03, 2009 at 10:39:57AM +0100, Gerhard Wiesinger wrote:
> Hello!
>
> The ethernet driver performance especially on TX is very limited and  
> takes 100% system resources. For details see below.
>
> Source can be found at:
> http://svn.dd-wrt.com:8000/dd-wrt/browser/src/linux/brcm/linux.v24_2/drivers/net/et
>
> Especially the following files are relevant:
> http://svn.dd-wrt.com:8000/dd-wrt/browser/src/linux/brcm/linux.v24_2/drivers/net/et/etc.c
> http://svn.dd-wrt.com:8000/dd-wrt/browser/src/linux/brcm/linux.v24_2/drivers/net/et/et_linux.c
> http://svn.dd-wrt.com:8000/dd-wrt/browser/src/linux/brcm/linux.v24_2/drivers/net/et/Makefile
> http://svn.dd-wrt.com:8000/dd-wrt/browser/src/include.v24/hnddma.h
> http://svn.dd-wrt.com:8000/dd-wrt/browser/src/shared/hnddma.c
>
> I think the problem comes from:
> http://svn.dd-wrt.com:8000/dd-wrt/browser/src/linux/brcm/linux.v24_2/drivers/net/et/et_linux.c#L422
> /*
>  * Yeah, queueing the packets on a tx queue instead of throwing them
>  * directly into the descriptor ring in the case of dma is kinda lame,
>  * but this results in a unified transmit path for both dma and pio
>  * and localizes/simplifies the netif_*_queue semantics, too.
>  */
>
> Can someone help me to improve the driver performance especially on TX?

Good luck.

IMHO, a better option would be to move to a 2.6-based kernel and to
use the b43 and b44 drivers.

John
-- 
John W. Linville		Linux should be at the core
linville@xxxxxxxxxxxxx			of your literate lifestyle.
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