linux-kernel - Re: Again... DMA speed too slow

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Date:	Sun, 13 Apr 2008 11:23:48 +0900
From:	Tejun Heo <htejun@...il.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
CC:	"J.A. Magallón" <jamagallon@....com>,
	"Linux-Kernel, " <linux-kernel@...r.kernel.org>,
	linux-ide@...r.kernel.org
Subject: Re: Again... DMA speed too slow

Andrew Morton wrote:
> On Sun, 30 Mar 2008 23:53:57 +0200 "J.A. Magallón" <jamagallon@....com> wrote:
> 
>> Hi all...
>>
>> I have tried to burn some data from the commandline with wodim (since time
>> ago I just used beasero...), and I have noticed this (media is CD, not DVD):
>>
>> Vendor_info    : 'HL-DT-ST'
>> Identification : 'DVDRAM GSA-H10N '
>> Revision       : 'JL12'
>> Device seems to be: Generic mmc2 DVD-R/DVD-RW.
>> Using generic SCSI-3/mmc   CD-R/CD-RW driver (mmc_cdr).
>> Driver flags   : MMC-3 SWABAUDIO BURNFREE
>> Supported modes: TAO PACKET SAO SAO/R96P SAO/R96R RAW/R16 RAW/R96P RAW/R96R
>> Speed set to 8467 KB/s
>> wodim: DMA speed too slow (OK for 5x). Cannot write at speed 48x.
>> Starting to write CD/DVD at speed  48.0 in real TAO mode for single session.
>>
>> I just can burn CDs at 5x ??
>> But then the program tries to write at 48x.
>> It the DMA message really true ?

Which controller are you on?  I bet the recording itself will work fine 
on 48x.  It's probably that READ/WRITE BUFFERs are executed using PIO 
for compatibility reasons.

-- 
tejun
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