Re: qemu 6.1.0 - i386 <= 2GB?

[Frans de Boer]

On 23/11/2021 11:44, Narcis Garcia wrote:

> El
>       23/11/21 a les 10:03, Frans de Boer ha escrit:
>       
> > On 23/11/2021 09:27, Narcis Garcia wrote:
> >         
> > > Some 32-bit system can't handle more
> > >           than 512 MiB of RAM, and some 32-bit systems can handle up to
> > >           64 GiB.
> > >           
> > >           
> > >           This is not related to memory assigned by Qemu to VE.
> > >           
> > >           
> > >           
> > >           Narcis Garcia
> > >           
> > >           
> > >           El 22/11/21 a les 18:38, Frans de Boer ha escrit:
> > >           
> > > > LS,
> > > >             
> > > >             
> > > >             OK, 32-bit systems can't handle more than 4GB memory. So, I
> > > >             specify '-m 4096' and still get only 2GB. Is this (very) old
> > > >             bug still not resolved or is it a feature now?
> > > >             
> > > >             
> > > >             Regards, Frans.
> > > >             
> > > >           
> > >         
> >         In theory an 32-bit processor can handle up-to 4GB of physical
> >         memory. However, due to limitations of some chip sets, the
> >         maximum amount of memory was often 512 MB or 1 GB. At that time
> >         the chip sets where lagging behind the processor capabilities.
> >         
> >         With newer chip sets it became practically possible to address 4
> >         GB and when using PAE, even beyond that. Although in case of the
> >         latter, the address space for a single process was always
> >         limited to 4 GB.
> >         
> >         
> >         So, whatever way you see it, the 2 GB limit imposed by QEMU
> >         seems rather arbitrary.
> >         
> >         
> >         --- Frans.
> >         
> >         
> >       
>       
>       Before talking about 64 GiB limit, I just tried
>       ubuntu-mate-18.04.1-desktop-i386 in a Qemu 5.2.0 VM
>       
>       50 GiB assigned and guest OS detects and uses it.
>       
>       
>     
    Then, what type of CPU did you specify?