Re: ATAPI CD missing interrupts

Ripping is not a real time task.

The kernel can keep up with 60 MB/s transfers from the fastest
hard drives. Don't worry, your CD drive is not "too fast for linux".


> "Sibbald, Alister" wrote:
> 
> Steve,
> 
> I don't know about the specifics, but I suspect the issue here may be
> in the inappropiateness of the Linux Kernel Scheduler ( or that of any
> other "general Purpose OS" for that matter to the needs of real time
> system requirements ( which is what you have when you're ripping ).
> I'm just guessing, but I suspect the reason that you get less "lost
> interrupts" with your old CD than your new is that it's that much
> slower, and the Kernel scheduling can "Keep Up" with the interrupt
> requests.
> 
> You could try ripping at slower speeds. If I am right, you will find
> that below a certain CD spin speed, you have no lost interrupts,
> because the kernel scheduler is not getting overrun by the interrupt
> requests.
> 
>         Regards
>                 Alister
> 
> -----Original Message-----
> From: Steve Smith [mailto:[email protected]]
> Sent: 11 June 2003 22:35
> To: [email protected]
> Subject: [paranoia] ATAPI CD missing interrupts
> 
> Using cdparanoia to "rip" music causes missing interrupts reported by
> dmesg. I am using RH9 2.4.20-18. I have less missing interrupts using
> an
> older (1999) AOPEN cdrom. I have more missing interrupts and kernel
> crash using MEMOREX 52X or LG 52X CDROM.  Using ide-scsi emulation
> appears to make it much worse.
> Is anyone else experinceing this?
> 
> Steve
> 
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-- 
David Balazic
--------------
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