Re: [PATCH] Dynamic irq_vector allocation for 2.6.0-test6-mm

[James Cleverdon <jamesclv@us.ibm.com>]

On Friday 03 October 2003 9:18 pm, Zwane Mwaikambo wrote:
> On Fri, 3 Oct 2003, James Cleverdon wrote:
> > irq_vector is indexed by a value that can be as large as the sum of all
> > the RTEs in all the I/O APICs.  On a 32-way x445 or a 16-way x440 with
> > PCI expansion boxes, the static array will overflow.
>
> What is number of interrupt sources on that 32x?

That depends on the number of PCI cards plugged into the slots and how many of 
the four interrupt lines (/INTA - /INTD) are used.

However it doesn't matter.  Even if no cards are present, the array will still 
overflow because the I/O APIC init routines assign a vector to each RTE and 
run off the end of irq_vector.

-- 
James Cleverdon
IBM xSeries Linux Solutions
{jamesclv(Unix, preferred), cleverdj(Notes)} at us dot ibm dot comm