On Mon, 2010-02-01 at 10:09 +0100, Gabriel Paubert wrote: > 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.
Yeah well, all Anton did was to push up the -max- value you can set in the config, not the default :-) But yeah, it's not "negligible" per-se. Cheers, Ben. _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@lists.ozlabs.org https://lists.ozlabs.org/listinfo/linuxppc-dev
