Re: [LSF/MM/BPF TOPIC] 64k (or 16k) base page size on x86

[David Hildenbrand (Arm)]

On 2/23/26 12:13, Kiryl Shutsemau wrote:
> On Mon, Feb 23, 2026 at 12:04:10PM +0100, David Hildenbrand (Arm) wrote:
> > On 2/20/26 20:33, Kalesh Singh wrote:
> > > On Fri, Feb 20, 2026 at 8:30 AM David Hildenbrand (Arm)
> > > <david@xxxxxxxxxx> wrote:
> > >
> > > I think most issues will stem from linkers setting the default ELF
> > > segment alignment (max-page-size) for x86 to 4096. So those ELFs will
> > > not load correctly or at all on the larger emulated granularity.
> >
> > Right, I assume that they will have to be thought about that, and possibly,
> > some binaries/libraries recompiled.
>
> I think backward compatibility is important and I believe we can get
> there without ABI break. And optimize from there.
>
> BTW, x86-64 SysV ABI allows for 64k page size:
>
> 	Systems are permitted to use any power-of-two page size between
> 	4KB and 64KB, inclusive.
>
> But it doesn't work in practice.

Even in well controlled environments you would run in a hyperscaler?

--
Cheers,

David