DMA alignment????

Anton Blanchard anton at
Sat Aug 9 01:33:44 EST 2003

> Our ethernet driver performance is not so good in
> powerpc machines. I have attached a link for a patch
> and brief description below, which talks about
> alignment of dma memory for rx and tx buffers.
> So my question is, Will there be increase in
> performance on powerpc machines if I also align my
> tx/rx dma pointers?????

Is your card PCI or PCI-X? The problem is much less of an issue on PCI-X
so long as the MMRBC is at a sufficiently high value.


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