I could be wrong on this, but I thought the point (or, a part of it at
least) of DMA was to bypass the CPU when moving files; last night I copied
200GB of files and it totally ate the CPU during the processes.  ext3 to
ext3, both SATA (from SATA2 to SATA1)...

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Slow SATA performance
https://bugs.launchpad.net/bugs/119730
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