DMA for ide-scsi?

[Mikael Pettersson]

On Sat, 13 Sep 2003 08:29:18 +0200, Jens Axboe <axboe@xxxxxxx> wrote:
>> Actually with 2.6, you no longer need ide-scsi.  You'll need to upgrade 
>> your cdrecord tools and probably your burning GUI, if you use one.  I've 
>> been burning that way for several months now.  (I'm using xcdroast, 
>> though I need to start it with "-n" since I'm using cdrecord 2.01a18.)  
>> This actually works better for me than ide-scsi as for some reason it 
>> uses less CPU.
>
>That's because it _is_ faster. It contains no silly memory allocations
>for the buffer and data copying in the kernel, the data is mapped from
>the user buffer and DMA'ed directly from there. It also uses DMA where
>ide-scsi wont.

That begs the question: why won't ide-scsi do DMA?
I understand you'd rather see it disappear (:->) but since I use
it for other ATAPI devices as well, I'd like to see it maintained
and fully operational. Having DMA in ide-scsi would be nice.

(And the concept of using a SCSI API to ATA devices is in itself
not broken, even if the implementation has some problems.)

/Mikael
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