From mboxrd@z Thu Jan  1 00:00:00 1970
From: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Subject: Re: Free memory reported but not used in new domain
 creation?
Date: Mon, 12 Aug 2013 08:53:21 -0400
Message-ID: <20130812125321.GK2898@phenom.dumpdata.com>
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To: "G.R." <firemeteor@users.sourceforge.net>
Cc: xen-devel <xen-devel@lists.xen.org>
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On Mon, Aug 12, 2013 at 03:55:17PM +0800, G.R. wrote:
> On Mon, Aug 12, 2013 at 2:15 PM, Pasi K=E4rkk=E4inen <pasik@iki.fi> wrote:
> > On Mon, Aug 12, 2013 at 01:46:30PM +0800, G.R. wrote:
> >> Hi guys,
> >> I need your help understanding this behavior:
> >>
> >> My host has 8GB RAM installed. Xen reports about 1.8G free memory with
> >> three domains running.
> >>
> >> xl info|grep memory
> >> total_memory           : 7887
> >> free_memory            : 1833
> >>
> >> xl list
> >> Name                                        ID   Mem VCPUs      State =
  Time(s)
> >> Domain-0                                     0   768     8     r----- =
    650.2
> >> nas                                          1  3072     2     -b---- =
    704.0
> >> windom                                       3  2047     4     r----- =
    520.7
> >>
> >> Now, when I tried to launch a forth domain with 1G memory assigned,
> >> here is the result:
> >>
> >> xl list
> >> Name                                        ID   Mem VCPUs      State =
  Time(s)
> >> Domain-0                                     0   380     8     r----- =
    654.1
> >> nas                                          1  3072     2     -b---- =
    706.7
> >> windom                                       3  2047     4     r----- =
    529.8
> >> freebsd                                      5  1024     1     -b---- =
      0.7
> >>
> >> xl info|grep memory
> >> total_memory           : 7887
> >> free_memory            : 1184
> >>
> >> As you can see, hypervisor is ballooning memory from dom0 instead of
> >> allocating from free_memory. If I increase the guest memory of the new
> >> domain to 1.5G or 2G. It simply fails to launch, saying something like
> >> dom0 memory is below minimal threshold.
> >>
> >> This gives me the impression that the free_memory is fake. Is it an
> >> expected behavior?
> >> What are the remaining 1GB memory for?
> >>
> >> PS: I'm on the xen 4.3.0 release.
> >>
> >
> > Hello,
> >
> > This is a long-standing bug in xl.
> > The workaround is to disable xl autoballooning..
> >
> > http://wiki.xen.org/wiki/Xen_Best_Practices
> >
> =

> Thanks for the info. It'll be great if you can point me to the bug /
> thread for reference.
> =

> I thought I was following that page, but maybe I made some mistake and
> the config does not take effect:
> =

> xen_commandline        : placeholder
> dom0_mem=3D1G,max:1536M,min:768M,dom0_max_vcpus=3D6,vpmu=3D1

You need to use spaces instead of ','.

> =

> If there are any syntax error, shouldn't it raise error?
> =

> > -- Pasi
> >
> =

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