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

[Jose Rodriguez <joheiker@xxxxxxxxx>]

> 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 ?
:(

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