Re: [Qemu-devel] release retrospective, next release timing, numbering

[Michal Suchánek]

On Sun, 29 Apr 2018 09:56:37 -0500
Richard Henderson <address@hidden> wrote:

> On 04/27/2018 02:01 PM, Michal Suchánek wrote:
> > Is there any reason why the 64bit emulator would not run on 32bit
> > system? The emulated 64bit system is .. emulated after all.  
> 
> It does run, but it requires that the 32-bit host perform double-word
> arithmetic to emulate the 64-bit guest.  When the 64-bit guest is
> really a 32-bit guest in disguise, this carries a performance penalty.
> 
> If we ever stop caring about 32-bit hosts, the question becomes moot.
> 

So if I installed 32bit pc binaries and 32bit qemu instead of the
x86_64 binaries on my ARM board it would be faster. Good to know if I
ever try wacky experiments like that again ;-)

Thanks

Michal