Re: Au1550 ethernet throughput low

[Dan Malek <dan@embeddedalley.com>]

On Jul 18, 2005, at 5:57 AM, jaypee@hotpop.com wrote:

> Thanks Bruno but I can't find that config option to select.
It is no longer an option in 2.6.  All Au1xxx processors force
CONFIG_DMA_NONCOHERENT because some cases still
don't work correctly.

> Changing from CONFIG_DMA_NONCOHERENT to CONFIG_DMA_COHERENT  make no 
> difference,
It won't, because the Ethernet driver knows the hardware works
correctly for this peripheral and assumes coherent IO.

Any Ethernet performance differences among Au1xxx designs are
likely to be related to processor speed, the memory interface
configuration, or PHY issues (improperly configured or high
error rates).

Thanks.

        -- Dan