Xen devel - Jan 2005 - Not enough memory for DOM0 memory reservation

I am trying attempting to boot the Xen Kernel on a IBM BladeCenter
2-way 8832 with 4095 MB of RAM and I keep getting the following
message:

(XEN) System RAM: 4095 (4193836kb)
(XEN) Not enough memory for DOM0 memory reservation

It never gets past this initial message.  I know the grub.conf is
correct because it is working fine on another machine.  I also made
sure I added HIGHMEM support to the kernel.  Has anyone seen this
before.

Could it be because of the 4 Gig memory limitation in Xen.  I have 4
1024 MB dimms so it should work.

Any help would be appreciated.

- Rich


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> I am trying attempting to boot the Xen Kernel on a IBM BladeCenter
> 2-way 8832 with 4095 MB of RAM and I keep getting the following
> message:
> 
> (XEN) System RAM: 4095 (4193836kb)
> (XEN) Not enough memory for DOM0 memory reservation
Which version of Xen? 2.0.3 has e820 parsing code, which might be
necessary for your system.

You''ll need to supply the full Xen boot messages. Can you connect a
serial line to the machine?

Ian


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> (XEN) Physical RAM map:
> (XEN) 0000000000000000 - 000000000009e000 (usable)
> (XEN) 000000000009e000 - 00000000000a0000 (reserved)
> (XEN) 00000000000e0000 - 0000000000100000 (reserved)
> (XEN) 0000000000100000 - 00000000f7fed040 (usable)
This looks fine. What does your Xen command line look like? What are you
setting dom0_mem to?

Ian 


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Hi
I have a PentiumIII with 131079 kb of RAM, I configed my system by following the
suggestions.
 When I boot xen0, the following error msg printed on the screen:

(xen)> not enough memory for DOM0 memory reservation


My grub configuration look like this:

title Xen 2.0.1 / XenLinux 2.6.9
        kernel /boot/xen.gz dom0_mem=131072 console=vga
        module /boot/vmlinuz-2.6.9-xen0 root=/dev/hda3 ro console=tty0

Any help would be appreciated.
Thanks

Fernanda


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Hi,
I have xen-2.0.1 in a PentiumIII with 131079 kb of RAM, I configed my 
system by following the suggestions.
When I boot xen0, the following error msg printed on the screen:

(xen) not enough memory for DOM0 memory reservation


My grub configuration look like this:

title Xen 2.0.1 / XenLinux 2.6.9
       kernel /boot/xen.gz dom0_mem=131072 console=vga
       module /boot/vmlinuz-2.6.9-xen0 root=/dev/hda3 ro console=tty0

Any help would be appreciated.
Thanks

Fernanda

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On Tue, 18 Jan 2005 14:56:48 -0200, Fernanda Barbosa Coelho
<fbarbosa@pos.facom.ufu.br> wrote:
> Hi,
> I have xen-2.0.1 in a PentiumIII with 131079 kb of RAM, I configed my
> system by following the suggestions.
> When I boot xen0, the following error msg printed on the screen:
> 
> (xen) not enough memory for DOM0 memory reservation
> 
> My grub configuration look like this:
> 
> title Xen 2.0.1 / XenLinux 2.6.9
>        kernel /boot/xen.gz dom0_mem=131072 console=vga
>        module /boot/vmlinuz-2.6.9-xen0 root=/dev/hda3 ro console=tty0

Xen is probably going to need some memory for itself. Try decreasing
the value for dom0_mem=. That should work.

Niraj
-- 
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Olá!

Fernanda Barbosa Coelho wrote:
> Hi,
> I have xen-2.0.1 in a PentiumIII with 131079 kb of RAM, I configed my 
> system by following the suggestions.
> When I boot xen0, the following error msg printed on the screen:
> 
> (xen) not enough memory for DOM0 memory reservation
> 
> 
> My grub configuration look like this:
> 
> title Xen 2.0.1 / XenLinux 2.6.9
>       kernel /boot/xen.gz dom0_mem=131072 console=vga
>       module /boot/vmlinuz-2.6.9-xen0 root=/dev/hda3 ro console=tty0
Xen itself uses some (32MB?) memory. So you''ll need to specify 
dom0_mem=80000 or so ;)

Regards,
Nuno Silva



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> Hi,
> I have xen-2.0.1 in a PentiumIII with 131079 kb of RAM, I configed my 
> system by following the suggestions.
> When I boot xen0, the following error msg printed on the screen:
> 
> (xen) not enough memory for DOM0 memory reservation
> 
> 
> My grub configuration look like this:
> 
> title Xen 2.0.1 / XenLinux 2.6.9
>        kernel /boot/xen.gz dom0_mem=131072 console=vga
>        module /boot/vmlinuz-2.6.9-xen0 root=/dev/hda3 ro console=tty0
You''ll need to reduce dom0_mem=131072 or better, buy some memory
for your machine...

Ian




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On Tue, 18 Jan 2005, Fernanda Barbosa Coelho wrote:
> Hi,
> I have xen-2.0.1 in a PentiumIII with 131079 kb of RAM, I configed my
> system by following the suggestions.
> When I boot xen0, the following error msg printed on the screen:
>
> (xen) not enough memory for DOM0 memory reservation
>
>
> My grub configuration look like this:
>
> title Xen 2.0.1 / XenLinux 2.6.9
>        kernel /boot/xen.gz dom0_mem=131072 console=vga
                                      ^^^^^^
Reduce this.

Xen has some internal bookkeeping memory, so you can''t allocate the
entire
memory to dom0.

In fact, this is rather strange thing to do, as then no memory would be left
to allocate to virtual instances.
>        module /boot/vmlinuz-2.6.9-xen0 root=/dev/hda3 ro console=tty0 Any

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You must allocate less memory for domain 0. Xen itself reserves a fixed
portion of memory (can''t remember off head), then you have so much left
for domains. 

Also a machine with only 128MB ram is not enough to do anything with,
you need room for other Xen domains. Try setting dom0_mem=65536. Then
you will have more than enough room to boot and create a  domain > 0
that is will not have much memory , but it''ll work.

Also for others reading. A xen-users mailing list would be nice so these
questions can be put in an appropriate place.

On Tue, 2005-01-18 at 14:56 -0200, Fernanda Barbosa Coelho
wrote:
> Hi,
> I have xen-2.0.1 in a PentiumIII with 131079 kb of RAM, I configed my 
> system by following the suggestions.
> When I boot xen0, the following error msg printed on the screen:
> 
> (xen) not enough memory for DOM0 memory reservation
> 
> 
> My grub configuration look like this:
> 
> title Xen 2.0.1 / XenLinux 2.6.9
>        kernel /boot/xen.gz dom0_mem=131072 console=vga
>        module /boot/vmlinuz-2.6.9-xen0 root=/dev/hda3 ro console=tty0
> 
> Any help would be appreciated.
> Thanks
> 
> Fernanda
> 
-- 
Jerone Young
Open Virtualization
IBM Linux Technology Center
jyoung5@us.ibm.com
512-838-1157 (T/L: 678-1157)



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On Tue, 18 Jan 2005, Fernanda Barbosa Coelho wrote:
> I have xen-2.0.1 in a PentiumIII with 131079 kb of RAM, I configed my
system
> by following the suggestions.
> When I boot xen0, the following error msg printed on the screen:
>
> (xen) not enough memory for DOM0 memory reservation
>
>
> My grub configuration look like this:
>
> title Xen 2.0.1 / XenLinux 2.6.9
>      kernel /boot/xen.gz dom0_mem=131072 console=vga
It seems like you''re trying to use the entire physical memory for
domain0.
But the hypervisor needs some memory of it''s own (32MB, IIRC). Try 
reducing dom0_mem to (phys_mem-32MB) or so?




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Fernanda Barbosa Coelho wrote:
> I have xen-2.0.1 in a PentiumIII with 131079 kb of RAM, I configed my 
> system by following the suggestions.
> When I boot xen0, the following error msg printed on the screen:
> 
> (xen) not enough memory for DOM0 memory reservation
> 
> 
> My grub configuration look like this:
> 
> title Xen 2.0.1 / XenLinux 2.6.9
>       kernel /boot/xen.gz dom0_mem=131072 console=vga
>       module /boot/vmlinuz-2.6.9-xen0 root=/dev/hda3 ro console=tty0
You''re telling Xen to reserve nearly as much memory as the entire
system
has; you have to give it a slice of system memory significantly smaller 
than that. Keep in mind that Xen has to reserve ~32 MB for itself, and 
you still need to have memory available to assign to other domains. 
You''ll probably have a hard time making use of Xen with only 128 MB of 
memory in your system. Might be time for an upgrade.

-- 
Derrik Pates
demon@devrandom.net


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Adam Heath wrote:
> In fact, this is rather strange thing to do, as then no memory would be
left
> to allocate to virtual instances.
You can always decrease domain''s alocation by baloon driver on the fly,
but of course you have to leave some memory for Xen''s internal use.

-jkt

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I tested Xen on our 4GB box and had no problems. I have checked in
some e820 fixes that will sort out some problems with big-mem
systems. It''s checked into the testing and unstable repositories so
you might want to pull the latest changesets and give it a go.

 -- Keir
> I am trying attempting to boot the Xen Kernel on a IBM BladeCenter
> 2-way 8832 with 4095 MB of RAM and I keep getting the following
> message:
> 
> (XEN) System RAM: 4095 (4193836kb)
> (XEN) Not enough memory for DOM0 memory reservation
> 
> It never gets past this initial message.  I know the grub.conf is
> correct because it is working fine on another machine.  I also made
> sure I added HIGHMEM support to the kernel.  Has anyone seen this
> before.
> 
> Could it be because of the 4 Gig memory limitation in Xen.  I have 4
> 1024 MB dimms so it should work.
> 
> Any help would be appreciated.
> 
> - Rich
> 
> 
> -------------------------------------------------------
> The SF.Net email is sponsored by: Beat the post-holiday blues
> Get a FREE limited edition SourceForge.net t-shirt from ThinkGeek.
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> Xen-devel@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/xen-devel
> 


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Fernanda Barbosa Coelho wrote:
> Hi
> I have a PentiumIII with 131079 kb of RAM, I configed my system by 
> following the suggestions.
> When I boot xen0, the following error msg printed on the screen:
> 
> (xen)> not enough memory for DOM0 memory reservation
> 
> 
> My grub configuration look like this:
> 
> title Xen 2.0.1 / XenLinux 2.6.9
>        kernel /boot/xen.gz dom0_mem=131072 console=vga
>        module /boot/vmlinuz-2.6.9-xen0 root=/dev/hda3 ro console=tty0
Xen needs some amount fo memory for itself (32MB, according to what 
other people said), so you''ll have to reduce the dom0_mem parameter by 
at least 32MB. And of course you''ll probably want some memory for other
domains, so you can decrease this number even more, or just use baloon 
driver for lowering dom0 memory usage on-the-fly.

-jkt

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