Re: Au1550 ethernet throughput low

[jaypee@hotpop.com]

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On 15/07/05 10:17:44, Bruno Randolf wrote:
> On Friday 15 July 2005 10:21, jaypee@hotpop.com wrote:
> > Yours is using ~30% cpu to send 100Mbps.
> > Mine is using 100% to send 66Mbps.
>
> i remember that ethernet thruput dropped from nearly 100Mbps to about
> 60-70Mbps on our Au1500 based board, when we enabled
> CONFIG_NONCOHERENT_IO...
Thanks Bruno but I can't find that config option to select.
I did find CONFIG_
Changing from CONFIG_DMA_NONCOHERENT to CONFIG_DMA_COHERENT  make no  
difference, although I can see that if the kernel invalidates the cache
line for each packet on send there would be a performance hit.

Clem can you send me your .config to see if I can figure out why your  
setup works?
> bruno
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mailto:jaypee@hotpop.com
http://www.jaypee.org.uk
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