Re: [Xen-devel] can not use all available memory

[Dan Magenheimer <dan.magenheimer@xxxxxxxxxx>]

> From: Tim Deegan [mailto:tim@xxxxxxx]
> Subject: Re: [Xen-devel] can not use all available memory
> 
> At 12:37 -0800 on 26 Nov (1353933449), Dan Magenheimer wrote:
> > > > I could be wrong (and I am confident someone will correct me if I am) 
> > > > but
> > > > I think this is because the Citrix memory model assumes there is an
> > > > inference-driven policy engine for load-balancing memory across 
> > > > competing
> > > > virtual machines ("squeezed").  I suspect squeezed returns unallocated
> > > > xen "free" memory to dom0.
> >
> > I forgot... it is called Dynamic Memory Control (DMC), not squeezed
> > in the XenServer product.
> 
> AFAIK XenServer uses dom0_mem= and doesn't balloon com0 after boot time.
> The idea of ballooning all free memory into dom0 is a xl-ism, inherited
> from xend, and not really a "Citrix" one.  It's useful if you've
> installed xen on a machine where dom0 is otherwise your main OS, but not
> particularly for a dedicated platform.

"inherited from xend"... was the autoballoon default the same in xend?
I don't recall ever turning it off manually and, when testing tmem,
I'm sure I would have had to.  Or maybe xend did use hypervisor free
memory before trying to autoballoon dom0?

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