Re: [Xen-devel] xm mem-set causes kernel panic

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

On 3 May 2006, at 22:15, Ian Pratt wrote:

> > We did run using unstable. We installed sles10 beta11 but we
> > pulled and built xen-unstable changeset 9903 from xensource
> > repository.  We have not tried with PAE hypervisor.  It is
> > not our focus.  How desperately would you need us to try PAE?
> Interesting. If you boot with dom0_mem=512 and then start a 15GB guest,
> do you see problems shrinking the guest's memory?
>
> I'd certainly be interested in hearing whether the problem exists on
> PAE.
I don't think this behaviour is surprising. The kernel is probably 
taking about 1% of memory to track memory usage. So trying to balloon 
down to 1-2% of your initial memory reservation is rather harsh.
The 'fix' here is to stop users being able to shoot their feet off, by 
setting a lower bound on ballooning that is related to the initial 
memory size of the guest, and/or quiesce the balloon driver when 
low-memory and out-of-memory code paths are executed in the guest.
 -- Keir


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