Re: 2.9test9-mm1 and DAO ATAPI cd-burning corrupt

[Nick Piggin]

Rob Landley wrote:

> On Thursday 06 November 2003 13:45, Linus Torvalds wrote:
>
> > On 6 Nov 2003, bill davidsen wrote:
> >
> > > I'm not sure what you mean by faster, burning runs at device limited
> > > speed in CPU time in the  less than 1% range if you remember to enable
> > > DMA. The last time I looked DMA didn't work in either kernel if write
> > > size was not a multiple of 1k, (or 2k?) has that changed?
> > DMA works fine
> >
> > 	IF YOU DON'T USE IDE-SCSI
> >
> > Don't use it. Please. There's no point.
> >
> > It's much more readable to do
> >
> > 	cdrecord dev=/dev/hdc
> >
> > than it is to do some stupid "scan SCSI devices" + "dev=0,1,0" or similar
> > totally incomprehensible crap that doesn't even work right.
> >
> >
> > > I'm not sure what you meant by faster, so don't think I'm disagreeing
> > > with you.
> > Faster as in "it uses DMA for everything, so you can actually burn at full
> > speed without having to worry about it or sucking up CPU".
> >
> > 		Linus
>
> Note this still doesn't mean you can scroll large X windows for two or three 
> seconds at a time without burning a coaster.
>
> I had high hopes with the new scheduler, but no.  (Maybe if I niced the heck 
> out of cdrecord...)

RT processes should work well with the scheduler. renicing if it is not
RT will help a little bit, but it doesn't do much to help maximum latency.


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