Messages in this thread | | | Date | Sun, 27 Jan 2002 22:25:51 +0100 | From | Jens Axboe <> | Subject | Re: [CFT] Bus mastering support for IDE CDROM audio |
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On Sun, Jan 27 2002, Robert Love wrote: > On Fri, 2002-01-25 at 03:40, Andrew Morton wrote: > > Reading audio from IDE CDROMs always uses PIO. This patch > > teaches the kernel to use DMA for the CDROMREADAUDIO ioctl. > > [...] > > This code has not been tested for its effects upon SCSI-based > > CDROM readers. It needs to be. > > Andrew, > > I wanted to confirm success of testing the patch with a SCSI CD-ROM > (Plextor UltraPlex Wide on aic7xxx). I used your updated patch off your > website. > > Audio rip completed without error. Performance seems the same, which I > assume is to be expected with SCSI readers.
sr already uses DMA for all transfers, so no performance gain was to be expected there. problem is ide-cd using pio for all packet command data transfers currently (modulo fs read write requests, of course)
not a whole lot of pio aic7xxx adapters out there :-)
-- Jens Axboe
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