Re: [Xen-devel] big memory and balloons

[Ian Pratt <Ian.Pratt@xxxxxxxxxxxx>]

> Besides, it has been quite a long time that no one has ever laid a 
> finger on
> 'balloon' tool. It's very likely broken, thus not a good start point 
> for you to
> play with Xen & XenoLinux.

I'm kinda not surprised that the balloon driver has rotted, as
no-one has tested it in ages.  I have a design for how memory
allocation *should* work if anyone is interested in implementing
it properly. (It's not hard, just not fun, hence we haven't
looked at it recently)

 > Is the linux config setting HIGHMEM4G supported?  If not, can Xen 
> > itself
> > see all 2GB and hand out independent 800MB chunks to guests
> 
> Currently not supported but not too much too add, mainly involving 
> modification
> to the domain building process.

No, the above is incorrect.

Xen should be able to see up to 4GB just fine, and be able to
hand it out to multiple guests.

Xenolinux does not support HIGHMEM4G, but it shouldn't be too
hard to add the support back in if anyone is interested (the
arch/i386 code should basically just work, but got ripped out for
expedience in the early days of Xenolinux, and hasn't been put
back).

HIGHMEM64G (PAE36) will be a lot more work to implement, and we
have no plans at present. x86_64 will likely happen first.

Best,
Ian


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