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    SubjectRe: e1000 driver 2.6.18 - how to waste processor cycles
    From: "Jesse Brandeburg" <>
    Date: Wed, 8 Nov 2006 17:01:44 -0800

    > If you can show that it is faster to use pci_dma_sync_single_for_cpu
    > and friends I'd be glad to take a patch.

    The problem is if you don't recycle the buffer and really unmap,
    you'll flush twice. That can potentially be expensive.
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