Part II: Running SMP kernel but only one cpu

Duane duane at
Tue May 5 05:49:01 UTC 2009

On 5/4/09, Tim Judd <tajudd at> wrote:

> IRQ15 is typically your secondary IDE controller; but due to PCI (or E-ISA)
> plug&play, including the PnP the BIOS may setup, lots of others can be on
> that bus too.

This box has one SCSI card running two SCSI drives. The IDE's are
disabled in the BIOS. But the SCSI card does feature in the problem:

>   # grep -i irq15 /var/run/dmesg.boot

No 'irq15' is found. One can see that the "interrupt storm" begins
when the SCSI drives begin to spin up, IF the machine is booting with
two cpus initialized. dmesg.boot is attached for everyone's
edification and amusement!

Another interesting datapoint is that if the machine is booted in Safe
Mode the "interrupt storm" disappears, but  so does the second cpu.

Best regards,

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