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

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Date:	Sun, 30 Mar 2008 18:59:13 -0600
From:	Robert Hancock <hancockr@...w.ca>
To:	"J.A. Magallón" <jamagallon@....com>
Cc:	"Linux-Kernel, " <linux-kernel@...r.kernel.org>
Subject: Re: Again... DMA speed too slow

J.A. Magallón 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 ?

No, UDMA33 should be more than fast enough. My guess is that wodim is 
determining the DMA speed using some unreliable mechanism.
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