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    SubjectRe: dma ripping
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    On Sat, 2004-05-15 at 16:58, Jens Axboe wrote:
    > 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?

    How do you check if dma is enabled?

    BTW it works with ide-scsi, so whatever the problem is must be ide-cd
    specific

    Ill post the test result later

    -
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