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powerpc: Increase NR_IRQS Kconfig maximum to 32768 

With dynamic irq descriptors the overhead of a large NR_IRQS is much lower
than it used to be. With more MSI-X capable adapters and drivers exploiting
multiple vectors we may as well allow the user to increase it beyond the
current maximum of 512.

32768 seems large enough that we'd never have to bump it again (although I bet
my prediction is horribly wrong). It boot tests OK and the vmlinux footprint
increase is only around 500kB due to:

struct irq_map_entry irq_map[NR_IRQS];

We format /proc/interrupts correctly with the previous changes:

             CPU0       CPU1       CPU2       CPU3       CPU4       CPU5
  286:          0          0          0          0          0          0
  516:          0          0          0          0          0          0
16689:       1833          0          0          0          0          0
17157:          0          0          0          0          0          0
17158:        319          0          0          0          0          0
25092:          0          0          0          0          0          0

Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Anton Blanchard 2010-01-31 01:14:03 +00:00 committed by Benjamin Herrenschmidt
parent 98ceb75c7c
commit 859aefc5af
1 changed files with 1 additions and 1 deletions
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arch/powerpc/Kconfig
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@ -58,7 +58,7 @@ config IRQ_PER_CPU
config NR_IRQS
int "Number of virtual interrupt numbers"
range 32 512
range 32 32768
default "512"
help
This defines the number of virtual interrupt numbers the kernel