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

[Markus Armbruster]

Peter Maydell <address@hidden> writes:

> On 5 March 2013 13:26, Michael Tokarev <address@hidden> 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.
>
>> Some distributions (eg ubuntu) had a local patch to increase
>> this value, for years.
>>
>> Maybe it's time to increase the default RAM size a bit?
>> Make it arch-specific if needs to be ?
>
> I tried two years ago to get a 'default RAM size' parameter
> added to the QEMUMachine struct, but the patchseries got shot
> down because it didn't attempt to address NUMA / simulate
> the fact you can only add RAM one DIMM at a time / etc...
>
> http://lists.gnu.org/archive/html/qemu-devel/2011-03/msg02907.html

As so often, the better we wish we had is the enemy of the good we could
have, if we weren't so pig-headed about it.