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Re: [Qemu-devel] How to enable more than 2047 MB RAM on 32 bit host syst
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From: |
Gerd Hoffmann |
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Subject: |
Re: [Qemu-devel] How to enable more than 2047 MB RAM on 32 bit host systems for 32 bit guests? |
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Date: |
Tue, 27 May 2014 13:46:10 +0200 |
On Di, 2014-05-27 at 13:35 +0200, Erik Rull wrote:
> Hi Gerd,
>
> okay, that makes sense. What is the theoretical max. amount that can be
> assigned? QEMU with KVM has less than 200MB overhead, so 2.5GB should be
> possible, right?
Don't know for sure, depends on how the address space layout looks like.
cat /proc/${pid}/maps should give a clue.
Address space is not only needed for qemu and guest memory, but also for
shared library mappings, thread stacks etc. Probably there are holes
due to address space randomization. And qemu needs a single, big chunk
for the guest memory.
cheers,
Gerd