Re: [Bugme-new] [Bug 7027] New: CD Ripping speeds slow with 2.6.17

From: Mike Galbraith
Date: Sun Aug 20 2006 - 16:45:02 EST

On Sun, 2006-08-20 at 13:28 -0400, Ryan Newberry wrote:
> Jan Engelhardt wrote:
> >>>> I'm skeptical. Is the source for this application available? I'd like
> >>>> to see this problem.
> >>>>
> >>> (never mind. saw your other post, found source)
> >>>
> >> Hm. I can't get better than 1.4x rip speed out of it with a stock SuSE
> >> 10.1 kernel (2.6.16). It's also using truckloads of cpu, whereas the CD
> >> rippers that came with this distro use a percent or two.
> >>
> >
> > What command did you use to rip?
> >
> >
> >
> > Jan Engelhardt
> >
> The ripper he's using is ripoff I assume (source code here:
> extraction functionality contained in src/RipOffExtractor.c) . It uses
> libparanoia to do its job, like the cdparanoia command. On my system,
> ripoff has high CPU usage with a 2.6.16 kernel as well, but it reports a
> 9.0x rate on average.

Watching the .16 kernel, it boosts to interactive status frequently, but
even with this mega-boost, it uses so much cpu that it repeatedly falls
into the expire (unbounded latency) category.

At this point, I think this app has problems.

> Could the fact that it has such high CPU usage be a possible reason I am
> experiencing a slower ripping speed (1.2x) when the patch that was git
> bisected is applied?

Short answer, with a lot of interpolation, yes.


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