Re: [CFT] Bus mastering support for IDE CDROM audio
Jens Axboe (axboe@suse.de)
Sun, 27 Jan 2002 22:25:51 +0100
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
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/