PCI64 DMA (master) read vs. write speed

Discussion in 'Windows Vista Drivers' started by Brannon King, Dec 12, 2003.

  1. Brannon King

    Brannon King Guest

    Inasmuch as the hardware for my PCI64 (66MHz) device is nearly identical for
    both reads and writes, what possible driver/OS issue would cause my
    write-to-device speed to be slower than the read-from-device? I'm currently
    seeing apx 170MB/s for reads from the device and 70MB/s for writes to the
    device. I'm using the bus commands 1110 and 1111 in the hardware with no
    scatter/gather. Do these speeds look reasonable? Thanks.
    Brannon King, Dec 12, 2003
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