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Date: Sun, 27 Jan 2002 10:11:31 +0100
From: Kristian <kristian.peters@korseby.net>
To: Andrew Morton <akpm@zip.com.au>
Cc: kevin@labsysgrp.com, linux-kernel@vger.kernel.org, gcoady@bendigo.net.au
Subject: Re: [CFT] Bus mastering support for IDE CDROM audio
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Andrew Morton <akpm@zip.com.au> wrote:
> There's an updated patch at
> 
> 	http://www.zip.com.au/~akpm/linux/2.4/2.4.18-pre7/ide-akpm.patch
> 
> It now supports multi-frame transfers and should fix the problem
> which you observed.

Your first patch behaves much better as the second. It seems that my drives are running with PIO only again. I see no problems with your first patch.


cdparanoia with ide-akpm-1:

/dev/scd0: (CPU ~40%)
	real    1m10.194s
	user    0m6.560s
	sys     0m2.880s
/dev/scd1: (CPU ~40%)
	real    2m8.283s
	user    0m7.230s
	sys     0m3.890s


cdparanoia with ide-akpm-2:

/dev/scd0: (CPU ~80%)
	real    1m37.472s
	user    0m7.340s
	sys     0m3.290s
/dev/scd1: (CPU ~50%)
	real    2m40.879s
	user    0m7.650s
	sys     0m3.620s


dd if=/dev/scd0 of=test.iso:

And dd consumes about 5% CPU with your first patch and almost 90% with your second patch as I would disable dma on it (and the system gets really slow responding).


My specs:

hdc: LTN526S, ATAPI CD/DVD-ROM drive
hdd: Hewlett-Packard CD-Writer Plus 9100b, ATAPI CD/DVD-ROM drive

I'm using ide-scsi:
scsi0 : SCSI host adapter emulation for IDE ATAPI devices
  Vendor: LITEON    Model: CD-ROM LTN526S    Rev: YS0A
  Type:   CD-ROM                             ANSI SCSI revision: 02
  Vendor: HP        Model: CD-Writer+ 9100b  Rev: 1.06
  Type:   CD-ROM                             ANSI SCSI revision: 02


I'm using 2.4.18-pre3-ac2. Maybe there're some collisions with Andre's IDE patches ?


*Kristian

  :... [snd.science] ...:
 ::
 :: http://www.korseby.net
 :: http://gsmp.sf.net
  :.........................:: ~/$ kristian@korseby.net :
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