mpc8548 does not make use of DMA when doing memory copy?

[Kumar Gala]

On Nov 2, 2009, at 9:40 AM, hank peng wrote:

> Kernel version is 2.6.30 and I have enabled fsl DMA engine during
> configuring kernel. After system booted, I have seen only 38 DMA
> interrupts, and no increase later when I am doing data transfer
> through network.
> So I wonder if mpc8548  had made use of DMA engine when doing memcpy,
> or maybe if there are other things I haven't noticed?

The dma engine code is not normally used for normal memcpy's in the  
kernel.  There are explicit call sites that have async behavior that  
should use it (like the networking code).

- k