Re: [Xen-devel] libxl: error: libxl.c:2150:libxl_set_memory_target new target 0 for dom0 is below the minimum threshold

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Tue, 2011-11-22 at 08:30 +0000, Teck Choon Giam wrote:
> On Tue, Nov 22, 2011 at 4:18 PM, Ian Campbell <Ian.Campbell@xxxxxxxxxx> wrote:
> > On Tue, 2011-11-22 at 07:56 +0000, Teck Choon Giam wrote:
> > [...]
> >> memory = 15360
> >> maxmem = 15360
> > [...]
> >> How much RAM does the host system have? What are your hypervisor and
> >> > dom0 command lines.
> >>
> >> 16GB RAM.
> >
> > So you are assigning 15GB out of a total of 16GB to the guest which
> > necessitates ballooning dom0 from 16GB down to 1GB.
> 
> I actually set dom0-min-mem 512 in xend-config.sxp as well.

xl/libxl don't use this configuration file.

> 
> >
> >> title Scientific Linux (2.6.32.47-0.xen.pvops.choon.sl6)
> >>       root (hd0,0)
> >>       kernel /xen.gz dom0_mem=512M loglvl=all guest_loglvl=all cpuidle=0 
> >> cpufreq=none
> >
> > But you have already forced the dom0_mem to 512M. I suspect this is
> > colluding with the above ballooning to make it look as if dom0 should be
> > ballooned to <128M, which causes xl to print a warning message. Perhaps
> > someone who understands this stuff can comment on whether or not this
> > should be the case.
> >
> > Can you try setting "autoballoon=0" in /etc/xl.cfg.
> 
> You mean /etc/xen/xl.conf?  I have done so and guess what?  IT WORKS!!! :)

Great.

Ian.

> 
> >
> > I can't see anything in the range 23110:23190 which might have caused a
> > change in behaviour here though.
> >
> >>       module /vmlinuz-2.6.32.47-0.xen.pvops.choon.sl6 ro
> >> root=UUID=154127e6-9469-4124-9a42-1f6c6160adf4
> >> rd_MD_UUID=d5126687:736a76db:5d5f597f:8b16fad4 rd_NO_LUKS rd_NO_LVM
> >> rd_NO_DM LANG=en_US.UTF-8 SYSFONT=latarcyrheb-sun16 KEYBOARDTYPE=pc
> >> KEYTABLE=us crashkernel=auto rhgb quiet panic=5 panic_timeout=10
> >>       module /initramfs-2.6.32.47-0.xen.pvops.choon.sl6.img
> >>
> >> >
> >> > What is the last changeset which worked for you?
> >>
> >> I did provide last working changeset is 23110 in my initial email.
> >
> > So you did, sorry I missed it.
> >
> > Ian.
> 
> You do not need to say sorry as without your assistance I can't even
> possible play with Xen for so long and having fun ;)
> 
> Thanks.
> 
> Kindest regards,
> Giam Teck Choon



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