Slow dvd writing

[Stephen Shirley]

Hi,

robot wrote:
| I'm having a similar problem. NEC 3520A writer with 8x media that writes
| at just over 2x  :sad: .
|
| If I do hdparm /dev/dvd after bootup I get:
|
|
| Code:
| --------------------
|     /dev/dvd:
|   IO_support   =  0 (default 16-bit)
|   unmaskirq    =  0 (off)
|   using_dma    =  0 (off)
|   keepsettings =  0 (off)
|   readonly     =  0 (off)
|   readahead    = 256 (on)
|   HDIO_GETGEO failed: Invalid argument
| --------------------

I have the exact same drive, haven't tried writing any dvds on it yet,
but on boot (with hoary, uptodate as of yesterday):

root at weasel:~ # hdparm /dev/hdc
/dev/hdc:
~ IO_support   =  1 (32-bit)
~ unmaskirq    =  1 (on)
~ using_dma    =  0 (off)
~ keepsettings =  0 (off)
~ readonly     =  0 (off)
~ readahead    = 256 (on)
~ HDIO_GETGEO failed: Invalid argument

root at weasel:~ # hdparm -d1 /dev/hdc
/dev/hdc:
~ setting using_dma to 1 (on)
~ using_dma    =  1 (on)

I have to say, i'm very surprised dma wasn't turned on automatically. I
noticed last night that dvds wouldn't play smoothly, didn't even think
to check dma as every disto i've used for the past few years has had
this working (including warty iirc). The chipset is a via kt800, amd64
platform.

Steve