Re: [Gumstix-users] Ethernet DMA on Tobi Board

[Scott E. <sc...@ju...>]

I'm using my own O/S image built with Yocto. I  added the iperf
package to my  build.

I took  a look and you are right about DMA not being used.

There is no DMA code at all in the smsc911x.c driver, so it's  not
something you can simply enable. 

Maybe it was a design decision since socket packet sizes can vary so
much. Setting up DMA for small transfers might be more expensive
then an assembler 'memcpy' which is effectively how it's done now.

Big block transfers would probably benefit from DMA.




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