From: Jens Axboe <axboe@suse.de>
To: Robert Love <rml@tech9.net>
Cc: Andrew Morton <akpm@zip.com.au>, lkml <linux-kernel@vger.kernel.org>
Subject: Re: [CFT] Bus mastering support for IDE CDROM audio
Date: Sun, 27 Jan 2002 22:25:51 +0100 [thread overview]
Message-ID: <20020127222551.B7548@suse.de> (raw)
In-Reply-To: <3C5119E0.6E5C45B6@zip.com.au> <1012166472.812.7.camel@phantasy>
In-Reply-To: <1012166472.812.7.camel@phantasy>
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
next prev parent reply other threads:[~2002-01-27 21:26 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-01-25 8:40 [CFT] Bus mastering support for IDE CDROM audio Andrew Morton
2002-01-25 19:21 ` Kevin P. Fleming
2002-01-27 2:13 ` Dan Chen
2002-01-27 3:16 ` Andrew Morton
2002-01-27 6:41 ` Andrew Morton
2002-01-27 9:11 ` Kristian
2002-01-27 10:19 ` Kristian
2002-01-27 19:54 ` Ed Sweetman
2002-01-28 8:29 ` Andrew Morton
2002-01-28 9:51 ` benh
2002-01-28 9:51 ` Andrew Morton
2002-01-28 15:50 ` Ed Sweetman
2002-01-28 17:13 ` Kristian
2002-01-28 13:51 ` Kristian
2002-01-28 19:21 ` Kevin P. Fleming
2002-01-26 8:43 ` Dan Chen
2002-01-26 12:03 ` Kristian
2002-01-27 21:21 ` Robert Love
2002-01-27 21:25 ` Jens Axboe [this message]
2002-01-27 21:36 ` Andrew Morton
2002-01-27 21:40 ` Robert Love
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