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    SubjectRe: sata_nv times out for BD-ROM iHOS104-08
    Hi Tejun,

    On Mon, Feb 22, 2010 at 9:38 PM, Tejun Heo <> wrote:
    > On 02/22/2010 06:28 AM, Cengiz Günay wrote:
    >> I was able to read a regular DVD in the drive. According to dmesg the
    >> negotiated speed was down to UDMA/33, so I am not sure about the
    >> performance of the drive.
    > Hmmm.... it could be that the drive is sending more data then
    > requested and the state machine in the controller doesn't like that
    > and fails to assert IRQ on the host side. You're still getting
    > timeouts on 96 byte dma inquiries. Can you please this patch?

    Before and after the swncq-atapi-pio patch I still get awful read
    times from the BD-ROM drive:

    $ time dd if=/dev/sr0 of=/dev/null bs=64k count=1024
    67108864 bytes (67 MB) copied, 106.945 seconds, 628 kB/s
    => real 1m46.977s

    Compared to reading the same DVD in my DVD-ROM drive:

    $ time dd if=/dev/hda of=/dev/null bs=64k count=1024
    67108864 bytes (67 MB) copied, 13.8403 seconds, 4.8 MB/s
    => real 0m13.860s

    I attached the full dmesg after the swncq-atapi-pio patch.

    [unhandled content-type:application/octet-stream]
     \ /
      Last update: 2010-02-28 18:27    [W:0.033 / U:32.176 seconds]
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