On Sun, Jan 31, 2010 at 10:14:03PM +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:
Only 1/2 MB?
I'm running Linux on 12 year old PPC machines which have 16MB
or RAM (ok, they are still running an old kernel, but a few
patches like this and they wont't even boot). The kernels
I have are well below 1MB, code+data+bss.
Yes it is configurable, thanks, and 64 is enough for these
machines (8259 plus an MPIC), so it's not that crucial.
What I object to is calling 1/2MB negligible.
Gabriel
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