Messages in this thread | | | Date | Sat, 13 Sep 2003 13:01:32 +0200 (MEST) | From | Mikael Pettersson <> | Subject | DMA for ide-scsi? |
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On Sat, 13 Sep 2003 08:29:18 +0200, Jens Axboe <axboe@suse.de> 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.)
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