Re: cdrom: dropping to single frame dma

[David N. Arnold]

Jens Axboe wrote:
> On Sun, Jul 25 2004, David Ford wrote:
>
> > I've been trying to rip my CDs onto my HD, and last night after about 7 
> > CDs I realized I was getting junk and it was taking forever to rip a 
> > CD.  I'm using 2.6.8-rc2 and I have two different CD-ROMs in my 
> > machine.  Both are burners.
> >
> > I got a single "cdrom: dropping to single frame dma" message which 
> > according to my research is part of the culprit.
> >
> > See the thread on LKML back on 5/15/2004 titled "dma ripping", and again 
> > on 6/15 titled "cdrom ripping / dropping to dingle frame dma" -- yes 
> > that's a "d".
> >
> > I'm guessing that Jens' patch for this didn't make it into the kernel.
>
>
> Try this.
>
> --- linux-2.6.8-rc2-mm1/drivers/cdrom/cdrom.c~	2004-08-02 14:56:48.259992912 +0200
> +++ linux-2.6.8-rc2-mm1/drivers/cdrom/cdrom.c	2004-08-02 15:20:58.326549288 +0200
> @@ -2004,6 +2004,8 @@
>  	struct packet_command cgc;
>  	int nr, ret;
>  
> +	cdi->last_sense = 0;
> +
>  	memset(&cgc, 0, sizeof(cgc));
>  
>  	/*
> @@ -2055,6 +2057,8 @@
>  	if (!q)
>  		return -ENXIO;
>  
> +	cdi->last_sense = 0;
> +
>  	while (nframes) {
>  		nr = nframes;
>  		if (cdi->cdda_method == CDDA_BPC_SINGLE)
> @@ -2102,6 +2106,7 @@
>  
>  		nframes -= nr;
>  		lba += nr;
> +		ubuf += len;
>  	}
>  
>  	return ret;

I don't know if it's a result of upgrading to 2.6.8-rc2 (from 2.6.5) or 
from the patch, but it has changed things.  I still get

hdd: DMA timeout retry
hdd: timeout waiting for DMA
hdd: status timeout: status=0xd0 { Busy }
hdd: status timeout: error=0x00
hdd: drive not ready for command
hdd: ATAPI reset complete
cdrom: dropping to single frame dma

but ripping stays at its normal speed (5.0x instead of 0.6x) and the 
file produced is correct instead of skipping/silence.

It doesn't fix the true issue of why I'm getting DMA timeouts, but it 
does make ripping useable.

P.S. Does anyone know why this:

gst-launch-0.8 cdparanoia ! vorbisenc ! filesink location="music.ogg"

would cause a DMA timeout but this:

gst-launch-0.8 cdparanoia ! queue ! { vorbisenc ! filesink 
location="music.ogg" }

wouldn't?

Thanks,
Dave Arnold
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