Re: [Qemu-devel] [PATCH QEMU] transparent hugepage support

[Jamie Lokier]

Andrea Arcangeli wrote:
> On Fri, Mar 12, 2010 at 06:41:56PM +0000, Paul Brook wrote:
> > Doesn't non-PAE (i.e. most 32-bit x86) use 4M huge pages? There's still a 
> > good 
> > number of those knocking about.
> 
> Yep, but 32bit x86 host won't support transparent hugepage (certain
> bits overflows in the kernel implementation, there's no more space in
> the page struct). It's not worth it IMHO.

Perhaps the performance figures would be even more significant for
32-bit x86 than 64-bit, due to the smaller TLBs.

I guess that's not what you mean by worth it?

-- Jamie