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Date: Mon, 04 May 2009 20:29:36 -0500
From: Adam Vande More <amvandemore@gmail.com>
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Subject: Re: Part II: Running SMP kernel but only one cpu
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Duane wrote:
> The bios in this old Micron dual PPro-180 full tower antique only
> initializes the second CPU if the machine is cold-booted.  A simple
> 'reboot' results in a single processor machine regardless of the
> kernel that is launched. This fact -- unknown to me before last night
> -- was the source of a great deal of lost time!
>   
Good you found a work around.  You might try ensuring your running 
latest avail bios as well.
> My 6.4 SMP kernel (now customized) runs just fine, with both cpus
> active, *except* for this message streaming constantly up the boot
> console.
>
> (from /var/log/messages:)
>
> May  4 20:20:33 poobah kernel: interrupt storm detected on "irq15:";
> throttling interrupt source
> May  4 20:21:02 poobah last message repeated 42 times
> May  4 20:21:03 poobah login: ROOT LOGIN (root) ON ttyv1
> May  4 20:21:03 poobah kernel: interrupt storm detected on "irq15:";
> throttling interrupt source
> May  4 20:21:33 poobah last message repeated 30 times
> May  4 20:23:33 poobah last message repeated 120 times
> May  4 20:33:33 poobah last message repeated 599 times
> May  4 20:40:01 poobah last message repeated 387 times
> etc etc ad repetitum infinitum
>
> Question1: Is this something I should go to some lengths to eliminate?
>   
Yes, it's probably something you should eliminate. 
> Question2: What the heck is it?
>   
A poor explanation is the devices are fighting over an IRQ.  Generally, 
simplest fix is to find what devs are on that IRQ, and manually reassign 
one dev to a different IRQ.
>
> Best regards,
>
>