On Sun, 2010-01-31 at 22:14 +1100, Anton Blanchard wrote: > 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 could dynamically allocate that one. Cheers, Ben. > 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 <an...@samba.org> > --- > > Index: linux-cpumask/arch/powerpc/Kconfig > =================================================================== > --- linux-cpumask.orig/arch/powerpc/Kconfig 2010-01-31 15:07:11.707211107 > +1100 > +++ linux-cpumask/arch/powerpc/Kconfig 2010-01-31 21:52:39.999711689 > +1100 > @@ -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 _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@lists.ozlabs.org https://lists.ozlabs.org/listinfo/linuxppc-dev
