Re: [Xen-devel] Strange memory balloning problem even if balloning is disabled

[Fabio Fantoni <fabio.fantoni@xxxxxxx>]

Il 03/03/2015 12:09, David Vrabel ha scritto:
> On 03/03/15 09:05, Fabio Fantoni wrote:
> > Il 02/03/2015 17:31, David Vrabel ha scritto:
> > > On 02/03/15 16:23, Jan Beulich wrote:
> > > > > > > On 02.03.15 at 16:52, <fabio.fantoni@xxxxxxx> wrote:
> > > > > On systems with wheezy as dom0 and kernel 3.2 it seems there are no
> > > > > visible problems.
> > > > > After updating the kernel to 3.16 (from backports repository), after
> > > > > starting the domUs, I get many of these errors in syslog and kern.log
> > > > > (infinite loop):
> > > > > xen:balloon: Cannot add additional memory (-17)
> > > > I have a vague recollection of some fix from David aiming at
> > > > avoiding to issue this message, but you would clearly have better
> > > > luck getting a qualified response if you Cc-ed kernel people when
> > > > reporting kernel problems (assuming you need explicit Cc-s at all,
> > > > as most relevant people read the list anyway afaik) - I certainly
> > > > can't figure by what criteria you put together the Cc list.
> > > You need
> > >
> > > 3dcf63677d4eb7fdfc13290c8558c301d2588fe8 (xen/balloon: cancel ballooning
> > > if adding new memory failed)
> > > fd8b79511349efd1f0decea920f61b93acb34a75 (xen/balloon: Don't continue
> > > ballooning when BP_ECANCELED is encountered)
> > >
> > > Or you can disable CONFIG_XEN_BALLOON_MEMORY_HOTPLUG.
> > >
> > > David
> > Readded the other part of my initial mail that explain better the
> > problem (also with the patch above applied)...
> >
> > The strange thing is that it should not use balloning because both dom0
> > and domUs have fixed memory set and balloning disabled.
> Ballooned pages are required to back grant mapped pages in blkback and
> netback.
>
> David
Thanks for your reply.
Based on your reply seems I must enable balloning in dom0 (for example 
dom0_mem=2G,max:3G) and/or xl.conf (autoballoon=1) to have it full 
working (for grant mapped pages), is it correct?
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