Re: [Xen-devel] error: (XEN) Not enough memory for DOM0 memory reservation.

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

When Xen boots, how much memory does it say it thinks your system has?
What is the output from booting a native Linux kernel (in particular
any lines very early that print the 'e820 map')?

 -- Keir

> Dear list,
> 
> I'm trying to get Xen working on a P3-600E with 320 MB RAM. (256+64)
> 
> It has suse linux 9.1 installed on it, and I tried to get xen running with
> both the binary download from the xen pages and the suse xen packages
> mentioned on this list some days ago.
> 
> Both 'install packages/kernels' lead to the same error:
> 
> (XEN) Not enough memory for DOM0 memory reservation
> 
> Whereafter a poweroff/poweron is the only way ouy. (Machine doesn't have a
> reset button, keyboard ctrl-alt-del does not respond)
> 
> The grub entries are:
> title Xen 2.0 / XenLinux 2.6.9
>         kernel (hd0,1)/boot/xen.gz dom0_mem=131072 console=vga
>         module (hd0,1)/boot/vmlinuz-2.6.9-xen0 root=/dev/hda2 ro console=tty0
> 
> title Xen2
>         kernel (hd0,1)/boot/xen.gz dom0_mem=65536
>         module (hd0,1)/boot/vmlinuz-2.6.8-24.8-xen root=/dev/hda2 vga=0x314 
> splash=silent desktop resume=/dev/hda1 showopts
>         module (hd0,1)/boot/initrd-2.6.8-24.8-xen.gz
> 
> Lowering the dom0_mem anything between 8192 to 13300 works, but then the
> kernel reboots during the boot process (for low values) and for higher
> values the boot script processes get killed by oom_kill, who eventually
> killes init too, kernel panics->reboot.  Setting dom0_mem to 13313 or
> anything bigger doesn't work, produces the error "Not enough memory for
> DOM0 memory reservation".
> 
> What happens between 13300 and 13313 is untested, I think it has been
> narrowed down sufficiently.
> 
> How can I solve this ? And/or what could I be doing wrong?
> 
> Thanks in advance,
> 
> Floris Martens
> 
> 
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