Re: [Xen-devel] Re: Failure booting domU with < 24M

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

> The problem seems to be the 8M(!) slack introduced with this patch.
> 
> # HG changeset patch
> # User kaf24@xxxxxxxxxxxxxxxxxxxx
> # Node ID 41489189b19e20b3fda4222e1787821d990206bc
> # Parent  c08e7f0b1ee597381d8c0dcca8a1b915b31bbc96
> Add slack to balloon driver to allow to counteract low-mem
> address space allocations in backend drivers.
> Signed-off-by: Keir Fraser <keir@xxxxxxxxxxxxx>
> 
> Could the 8M slack be made optional somehow? I like being able to have
> 16M domains...

With changeset 7616:6a2d93c2b32d332366cc5e8d11e85c476afa8f9b (which I
just checked in) if you specify 'mem=' as a Linux boot parameter then
the 8M slack in the mem_map and p2m table is disabled.

So, you should be able to boot a 16M domain with no slack by adding
'mem=16M' to its command line.

 -- Keir

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