Hi Tejun, On Mon, Feb 22, 2010 at 9:38 PM, Tejun Heo <tj@xxxxxxxxxx> 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. -Cengiz
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