Re: dom0 linux 3.6.0-rc4, crash due to ballooning althoug dom0_mem=X, max:X set

[Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>]

> > About nine of them deal with dom0_mem=max ballooning up right, so if you
> > ignore those:
> 
> > b9e0d95 xen: mark local pages as FOREIGN in the m2p_override
> > d79d595 xen: Add selfballoning memory reservation tunable.
> > f62805f xen: enter/exit lazy_mmu_mode around m2p_override calls
> 
> > Try reverting any of those.
> 
> Ah i missed your email since my hostingprovider was down :-(
> But anyway done a git bisect in the mean time that leads to:
> 
> [f62805f1f30a40e354bd036b4cb799863a39be4b] xen: enter/exit lazy_mmu_mode around m2p_override calls

OK. Hmm.that will take a bit of thinking to fix.
> 
> 
> > And if nothing works there then we can try to revert the ones that
> > deal with 'dom0_mem=max:XX'..
> 
> > I also need to be able to reproduce this. You said you can only reproduce this
> > on your Intel box - is this a fast Intel machine? It also looks like you only
> > have 2GB in the machine - and reserve 1GB to the dom0.
> 
> Machine is a quad core q9400 @ 2.66mhz, not very fast .. not very slow either

That is a fast machine. I was thinking you had a Core2 Solo or a Pentium IV Prescott.

> 
> > If you manually (so don't start the guest), balloon down - say to 512MB and then launch
> > a guest do you see this problem?
> 
> 
> Should i use
> 
> xl  mem-max domain-id mem
> 
> or
> 
> xl  mem-set domain-id mem

The later.
> 
> for that ?
> 
> 
> Perhaps a silly question, but why is it ballooning anyway ?
> I have set dom0's memory and there is enough left to create the domain ... or at least there should be ...

There was a bug in xl that would autoballoon. You can turn it off using some xl.conf file.

> 
> --
> Sander