[paranoia] ATAPI CD missing interrupts

[Sibbald, Alister]

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

<p>-----Original Message-----
From: Steve Smith [mailto:ssmith at htsi-texas.com]
Sent: 11 June 2003 22:35
To: paranoia at xiph.org
Subject: [paranoia] ATAPI CD missing interrupts

<p>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?

<p><p>Steve

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