Xen users - May 2010 - Error:(4, ''Out of memory'', "xc_dom_boot_mem_init: can''t allocate low memory for domain\n") SOLVED

> > On Fri, May 14, 2010 at 11:30:47AM -0430, Jose Rodriguez wrote:
>
> > > >    Hello everyone...
> > > >
> > > >    I get the following error when i try to creat a virtual
machine
> > > >
> > > >    Error: (4, ''Out of memory'',
"xc_dom_boot_mem_init: can''t allocate
> > low
> > > >    memory for domain\n")
> > > >
> > > >    I''m using Xen under Gentoo, kernel 2.6.32-r1 in
a i686 Dual Core
> AMD
> > > >    Opteron(tm) Processor 290 AuthenticAMD with 16Gb of
memory and 4Tb
> > of hard
> > > >    disk.
> > > >
> > > >    It was a pain to install xen in it but when i finally did
it, i
> get
> > this
> > > >    error whenever i try to create a vm.
> > > >
> > > >    I checked /var/log/xen/.log and here is some of the stuff
i get:
> > > >
> > > >    domain-builder-ng.log
> > > >
> > > >        virt_entry       = 0xffffffff80200000
> > > >        p2m_base         = 0xffffffffffffffff
> > > >    xc_dom_parse_elf_kernel: xen-3.0-x86_64:
0xffffffff80200000 ->
> > > >    0xffffffff8072ce88
> > > >    xc_dom_mem_init: mem 512 MB, pages 0x20000 pages, 4k each
> > > >    xc_dom_mem_init: 0x20000 pages
> > > >    xc_dom_boot_mem_init: called
> > > >    x86_compat: guest xen-3.0-x86_64, address size 64
> > > >    x86_compat: warning: failed (rc=-1)
> > > >    xc_dom_boot.c:143: panic: xc_dom_boot_mem_init:
can''t allocate low
> > memory
> > > >    for domain
> > > >    xc_dom_release: called
> > > >
> > > >    xend.log
> > > >
> > > >      File
> >
"/usr/lib/python2.6/site-packages/xen/xend/XendDomainInfo.py", line
> > > >    95, in create
> > > >        vm.start()
> > > >      File
> >
"/usr/lib/python2.6/site-packages/xen/xend/XendDomainInfo.py", line
> > > >    456, in start
> > > >        XendTask.log_progress(31, 60, self._initDomain)
> > > >      File
"/usr/lib/python2.6/site-packages/xen/xend/XendTask.py",
> line
> > 209,
> > > >    in log_progress
> > > >        retval = func(*args, **kwds)
> > > >      File
> >
"/usr/lib/python2.6/site-packages/xen/xend/XendDomainInfo.py", line
> > > >    2590, in _initDomain
> > > >        raise VmError(str(exn))
> > > >    VmError: (4, ''Out of memory'',
"xc_dom_boot_mem_init: can''t
> allocate
> > low
> > > >    memory for domain\n")
> > > >
> > > >    I tried changing the memory of dom0 so i have more left
for the
> > domU''s but
> > > >    it didn''t work.
> > > >
> > > >    I don''t know what else to do here. I''ve
searched online, and
> nothing
> > so
> > > >    far. I will go on w/ my search but if anyone has an idea
or
> > sugestion it
> > > >    will be useful.
> > > >
> > >
> > > Please paste your dom0 grub.conf.
> > >
> > > -- Pasi
> > Here is Dom0''s grub.conf:
> >
> > default 0
> > timeout 5
> > splashimage=(hd0,0)/boot/grub/splash.xpm.gz
> >
> > title Gentoo Xen-2.6.32
> > root (hd0,0)
> > kernel /boot/xen.gz
> > module /boot/kernel-2.6.32-xen root=/dev/sdy1
> >
> > title Gentoo Linux 2.6.32-r7
> > root (hd0,0)
> > kernel /boot/kernel-2.6.32-gentoo-r7 root=/dev/sdy1
real_root=/dev/sdy1
> >
> > title Gentoo-Xen 3
> > root (hd0,0)
> > kernel /boot/xen.gz
> > module /boot/kernelXEN3 root=/dev/sdy1
> >
> > title Gentoo Linux 2.6.27-r8
> > root (hd0,0)
> > kernel /boot/kernel-2.6.27-gentoo-r8 root=/dev/ram0
real_root=/dev/sdy1
> > initrd /boot/initramfs-genkernel-x86-2.6.27-gentoo-r8
> >
> > # vim:ft=conf:
> >
>
> Doing some research about this issue i found that it might be solved by
> adding dom0_mem to grub.conf. Now my grub.conf looks like this,
>
> default 0
> timeout 5
> splashimage=(hd0,0)/boot/grub/splash.xpm.gz
>
> title Gentoo Xen-2.6.32
> root (hd0,0)
> kernel /boot/xen.gz dom0_mem=4000M
> module /boot/kernel-2.6.32-xen root=/dev/sdy1
>
> title Gentoo Linux 2.6.32-r7
> root (hd0,0)
> kernel /boot/kernel-2.6.32-gentoo-r7 root=/dev/sdy1 real_root=/dev/sdy1
>
> Gentoo booted fine but i still get the same error whenever i try to create
> a
> virtual machine
>
> xm create -c /etc/xen/sl4.7-32bits.cfg
> Using config file "/etc/xen/sl4.7-32bits.cfg".
> Error: (4, ''Out of memory'', "xc_dom_boot_mem_init:
can''t allocate low
> memory
> for domain\n")
>
> Any sugestions ?
> :(
>
After playing around and doing A LOT of research i found out what was wrong.

For what i found online this error is solved:

- By adding the dom0_mem=XXXXXM at your grub.conf file, just by the kernel
line (which didn''t do it for me)

- Or if you are trying to create a 64bits VM on a 32bits Dom0. This was my
problem. In my .cfg, the domU kernel i was using for this VM was compiled on
a 64bits pc, so basically it was my mistake all the time  :P

So i compiled another kernel in the machine im trying to create VMs and it
worked :D

Hope i can help someone with this!


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