Re: KVM and the OOM-Killer

[Avi Kivity <avi@redhat.com>]

On 05/13/2010 04:39 PM, James Stevens wrote:
>> I'd go with 64-bit at 2GB and above. It's both faster and safer.
>
> safer, how? (apart from no lowmem exhaust).

Nothing apart from that (well, if you run nonpae you lose NX protection).

>
> On a different subject, the qemu documentation says a guest VM can 
> only have 2Gb of memory - does this still apply when using a 64bit 
> host O/S ?

The documentation is outdated.

>
>> Since you can run a 64-bit kernel with your existing userspace, at least
>> you have a simple upgrade path.
>
> Not sure I like the idea of running a 64bit user space kernel on top 
> of a 32bit host, prefer to re-install.
>
> Can I just replace my kernel with a 64bit one, or do I have to 
> re-install the host O/S ?

You can run 32-bit userspace with a 64-bit kernel, or reinstall, 
whichever you prefer.

I once upgraded a 32-bit Fedora install to 64-bit, but that takes some 
tinkering.

-- 
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