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List:       linux-smp
Subject:    Re: APIC related bug report - 2.4.* kernels
From:       wikne () lynx ! uio ! no (Jon Wikne)
Date:       2001-11-16 15:28:56
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Simon Garner <sgarner@expio.co.nz> wrote:

> From: "Jon Wikne" <wikne@lynx.uio.no>
> > >
> > > Not having a 2nd IDE frees up an IRQ.
> >
> > True, of course.
> ...
> >
> > And, being very tired last night, I forgot that the DVD-ROM
> > on this box used the IDE port I had to disable. I have this
> > intuition that I/O-intensive applications (i.e. multimedia)
> > will be less than happy if I connect this device as a slave
> > on the same IDE port as the main disk....
> 
> Hmm, interesting. If it is just freeing up an IRQ that makes the difference,
> you could alternatively try disabling one of the serial ports instead (if
> you have a PS/2 mouse you probably don't need two...).
> 
> Let me know if you try that and whether it works.

I tried disabling the second serial port (IRQ 3) instead,
and it did _not_ work. :(

Whatever this is, it has to do not only with the interrupt
as such, but with the IDE controller chip and possibly how
its interrupts are assigned.

I believe that the easiest thing to do for me at the moment
is to stick with kernel 2.2.20, which works nicely with SMP,
APIC _and_ IDE-controller, and try to fix the interaction
between this older kernel and RedHat 7.2, whereever that
might squeak.


-- Jon
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