Re: DVD-RAM + Linux?

From: John-Paul Stewart (jpstewart_at_binaryfoundry.ca)
Date: 08/28/04 

Date: Sat, 28 Aug 2004 15:32:47 -0400

The Real Slim Shady wrote:
> On Sat, 28 Aug 2004 19:21:39 +0200, Lasse Jensen wrote:
>
>
>>The Real Slim Shady wrote:
>>
>>
>>>On Sat, 28 Aug 2004 15:55:07 +0200, Lasse Jensen wrote:
>>>
>>>
>>>>I have a problem with my Toshiba SD-W1101 DVD-RAM drive. Reading CD's,
>>>>DVD's and DVD-RAM disks works fine, but when i write, my system start
>>>>to run encridible slow. I didn't have that problem when i used a
>>>>Panasonic drive and top doesn't show any processes hogging the CPU
>>>>time.
>>>
>>>Are you using dma?
>>
>>How do i set that for SCSI devices? hdparm won't let me do it.
>
> I beg you pardon?
> man hdparm:
>
> -v Display all settings, except -i (same as -acdgkmnru for IDE, -gr
> for SCSI or -adgr for XT). This is also the default behaviour
> when no flags are specified.
>
> Although this utility is intended primarily for use with (E)IDE hard
> disk devices, several of the options are also valid (and permitted) for
> use with SCSI hard disk devices and MFM/RLL hard disks with XT inter-
> faces.

Apparently you've never tried it with a SCSI device:

hdparm -d1 /dev/sda

/dev/sda:
  setting using_dma to 1 (on)
  HDIO_SET_DMA failed: Invalid argument

However, as I said elsewhere in this thread, it isn't necessary for a
SCSI disk. (Basically, SCSI does DMA only. There is no other mode of
operation, AIUI.)

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