Re: how to set DVD read speed for Pioneer DVD-303S ?

Jens Axboe (axboe@image.dk)
Mon, 10 Jan 2000 00:41:33 -0500

On Sun, Jan 09 2000, Harald Koenig wrote:
> in the mean time I got some 3 more DVD (video) disks, and those discs
> I can read with higher transfer rates!
>
> the two DVD9 discs (two layers, signle side) read up to 5.4 MB/sec (4x)
> while the DVD5 disc (sigle layer, single side) went up to 6.85 MB/sec (5x).

Nothing we can do about that, then. I suspect that this is usual,
though I've never benched my DVD drives.

> "drive speed" is always reported being 0 (zero). but looking at the
> code in scsi/sr.c get_capabilities() only gets called once at boot time

Pioneer does this. The capabilities page (where we read the speed)
is deprecated, but most drive still report it.

> code in scsi/sr.c get_capabilities() only gets called once at boot time
> from sr_finish(), so it's no big surprise that the value
> in /proc/sys/dev/cdrom/info doesn't change...

sr_select_speed should set that, I'll fix it up.

-- 
*  Jens Axboe <axboe@image.dk>
*  Linux CD-ROM Maintainer
*  http://www.kernel.dk


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