DMA time varying widely on MPC8272

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In my Linux device driver, I am frequently DMA'ing to the SDRAM.  My
board has an MPC8272 processor.  I have noticed the time from the
start of the DMA to when I get the DMA interrupt can vary as much as
100X.  The amount of data being DMA'd is consistent.  What could
account for such a wide variation?  Is there anything I can do to
insure that the DMA takes place in a timely manner every time?

Thank you.

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