Re: CVS commit: src/sys/arch

[Simon Burge <simonb%NetBSD.org@localhost>]

Manuel Bouyer wrote:

> On Sat, Jul 24, 2010 at 09:50:33AM +0200, Christoph Egger wrote:
>
> > How about making paddr_t always 64bit? That makes it much easier to deal
> > with in libkvm.
> 
> The overhead would need to be evaluated first.

I don't have any figures handy, but when I first tried 64-bit paddr_t
on Alchemy (MIPS) CPUs I wasn't able to notice any diffence with some
simple benchmarks (a build maybe?).  This would have been on a CPU in
the 400MHz range.

Obviously we can't compare that with modern x86, but I'd still be
surprised if you could notice a diffence using 64-bit paddr_t.

Cheers,
Simon.