Re: dma ripping

Jens Axboe
2004-05-15T14:58:07Z

On Sat, May 15 2004, Daniele Bernardini wrote:
>
> On Sat, 2004-05-15 at 12:14, Jens Axboe wrote:
> > On Fri, May 14 2004, Daniele Bernardini wrote:
> > > Hi Folks,
> > >
> > > I am trying to get cd ripping to work on a freshly installed SuSE 9.1 on
> > > IBM thinkpad R50 with dvdram drive.
> > >
> > > It works for a while and then hangs. At this point nothing short of a
> > > reboot works. Ripping stop working when the message
> > > cdrom: dropping to single frame dma
> > > comes up. The system feels slow for a couple of seconds and then is back
> > > to normal, but no ripping until next reboot
> > >
> > > I am running the 2.6.4 compiled by SuSE.
> >
> > Can you retest with this small debug patch applied.
> >
> > --- drivers/cdrom/cdrom.c~ 2004-05-15 12:12:24.770228291 +0200
> > +++ drivers/cdrom/cdrom.c 2004-05-15 12:13:25.101720866 +0200
> > @@ -1987,6 +1987,7 @@
> > struct request_sense *s = rq->sense;
> > ret = -EIO;
> > cdi->last_sense = s->sense_key;
> > + printk("rip failed, sense %x/%x/%x\n", s->sense_key, s->asc, s->ascq);
> > }
> >
> > if (blk_rq_unmap_user(rq, ubuf, bio, len))
>
> I did it and started ripping a cd it froze after 9 tracks, though did
> not see your message. I was looking at /var/log/messages (see below).
> BTW the system got instable and then froze had to power down. It
> happened before always after the ripping problem.
>
> Should I aswitch on debug for the cdrom?

Just an idea - can you log vmstat 5 info while doing this burn? Maybe
there's still a little leak in there, so watch the ram usage
(used/free/swap/cache).

Does your drive have dma enabled?

--
Jens Axboe