Re: PATCH: cdrecord: avoiding scsi device numbering for ide devices

Jens Axboe
2004-08-13T07:02:03Z

On Fri, Aug 13 2004, Måns Rullgård wrote:
> Bill Davidsen <davidsen@tmr.com> writes:
>
> > Con Kolivas wrote:
> >
> >> It was a hard lockup and randomly happened during a cd write,
> >> creating my first coaster in a long time... in rt mode ironically
> >> which is how it is recommended to be run. So I removed the foolish
> >> superuser bit and have had no problem since. Yes it was unaltered
> >> cdrecord source and it was the so-called alpha branch and... Not
> >> much else I can say about it really?
> >
> > I said I'd never seen this (true), but it could happen if you were
> > burning an audio CD using the ide-scsi or ATA: interface. In 2.6 the
> > ATAPI: interface uses DMA. I don't know what the program does if you
> > just say dev=/dev/hdx,

This is only true for recent 2.6 kernels.

> Whatever it does, it doesn't load the system noticeably.

ATA uses SG_IO. Bill should re-read most of this thread as he is
repeating what others have said and have been corrected on (not just
this mail, btw).

--
Jens Axboe