Re: ISDN massive packet drops while DVD burn/verify

Karsten Keil
2003-05-06T12:53:43Z

On Tue, May 06, 2003 at 02:39:02PM +0200, Stephan von Krawczynski wrote:
> On 06 May 2003 11:53:32 +0100
> Alan Cox <alan@lxorguk.ukuu.org.uk> wrote:
>
> > On Llu, 2003-05-05 at 18:26, Stephan von Krawczynski wrote:
> > > You mean UDMA 2 does not make it (which I had in the test case)?
> >
> > But is the transfer being done in UDMA mode ?
>
>
> # hdparm -v /dev/hdc
>
> /dev/hdc:
> HDIO_GET_MULTCOUNT failed: Invalid argument
> IO_support = 0 (default 16-bit)
> unmaskirq = 0 (off)
> using_dma = 1 (on)
> keepsettings = 0 (off)
> readonly = 0 (off)
> BLKRAGET failed: Invalid argument
> HDIO_GETGEO failed: Invalid argument
>
>
> using_dma means it's using dma for transfer, right?
>

It should, but so far I know it cannot do every thing with
dma.
My writer use:

pingi2:~ # hdparm -v /dev/hdc

/dev/hdc:
HDIO_GET_MULTCOUNT failed: Input/output error
IO_support = 1 (32-bit)
unmaskirq = 1 (on)
using_dma = 0 (off)
keepsettings = 0 (off)
readonly = 0 (off)
BLKRAGET failed: Input/output error
HDIO_GETGEO failed: Invalid argument

And I see no problems.

At least you can try hdparm -u1 (use a RW media).

--
Karsten Keil
SuSE Labs
ISDN development