Re: [Qemu-devel] default guest RAM size?

[Rob Landley <rob@landley.net>]

On 03/05/2013 12:09:27 AM, Peter Maydell wrote:
> On 5 March 2013 14:07, 陳韋任 (Wei-Ren Chen) <chenwj@iis.sinica.edu.tw>  
> wrote:
> > On Tue, Mar 05, 2013 at 01:40:38PM +0800, Peter Maydell wrote:
> >> On 5 March 2013 13:26, Michael Tokarev <mjt@tls.msk.ru> wrote:
> >> > For many years, qemu defaults to 128Mb of guest RAM size.
> >> > Today, this is just too small, and many OSes fails to boot
> >> > with this size, more, they fail to produce any reasonable
> >> > messages either (eg, windows7 just crashes at startup).
> >>
> >> If you make the default bigger then some boards will crash
> >> or behave weirdly because they try to map more RAM in than
> >> will fit into the space for RAM in their address maps.
> >
> >   So, 128Mb is still a good default? I am just wondering if those
> > boards with little memory still are major user of QEMU? :)
> 
> They may not be major but they're still in the codebase. You
> can't just arbitrarily break them -- you need to propose
> a path forward that doesn't do that.

256 can be handled by most things. The powerpc, arm, and mips boards I  
use in aboriginal linux all handle 256 megs. (The main reason sh4 isn't  
a real platform is it's hardwired to 64 megs.)

(Sparc32 can handle 256 megs ram but crashes if you feed it too long a  
kernel command line.)

Rob