# Question on memory usage

**URL:** <https://forums.suse.com/t/question-on-memory-usage/23886>\
**Category:** SLES Configure-Administer\
**Created:** [April 23, 2013, 2:18am UTC](https://forums.suse.com/t/question-on-memory-usage/23886 "2013-04-23T02:18:10Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![jkostic](https://avatars.discourse-cdn.com/v4/letter/j/a9a28c/32.png) [@jkostic](https://forums.suse.com/u/jkostic)\
**Post date:** [April 23, 2013, 2:18am UTC](https://forums.suse.com/t/question-on-memory-usage/23886/1 "2013-04-23T02:18:10Z")

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Hi There,

I have a hardware with 32Gb of RAM and I can only see 20GB on suse enterprise linux 11 SP2 with XEN hypervisor, is this normal?

Thanks for you support.

jko

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**Author:** ![system](https://us1.discourse-cdn.com/flex022/uploads/suse/original/2X/5/5012ba89e3ffb5220dac47d5ea0ba032e2fe1cb6.png) [@system](https://forums.suse.com/u/system)\
**Post date:** [April 23, 2013, 8:28am UTC](https://forums.suse.com/t/question-on-memory-usage/23886/2 "2013-04-23T08:28:55Z")

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On 04/22/2013 06:24 PM, jkostic wrote:[color=blue]

> Hi There,
> 
> I have a hardware with 32Gb of RAM and I can only see 20GB on suse  
> enterprise linux 11 SP2 with XEN hypervisor, is this normal?
> 
> Thanks for you support.
> 
> jko
> 
> [/color]

perhaps not an answer, but what does:

```auto
xm info
```

show with regards to how much memory you have?

Xen is a kernel. The SLES 11 SP2 you’re interfacing with is actually a special  
guest called Dom0.

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<div class="post-metadata">

**Author:** ![jkostic](https://avatars.discourse-cdn.com/v4/letter/j/a9a28c/32.png) [@jkostic](https://forums.suse.com/u/jkostic)\
**Post date:** [April 23, 2013, 10:26am UTC](https://forums.suse.com/t/question-on-memory-usage/23886/3 "2013-04-23T10:26:47Z")

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Hello  
The output is the following:

linux-jko:~ # /usr/sbin/xm info  
host : linux-jko  
release : 3.0.13-0.27-xen  
version : #1 SMP Wed Feb 15 13:33:49 UTC 2012 (d73692b)  
machine : x86\_64  
nr\_cpus : 16  
nr\_nodes : 2  
cores\_per\_socket : 4  
threads\_per\_core : 2  
cpu\_mhz : 2400  
hw\_caps : bfebfbff:28100800:00000000:00003b40:009ce3bd:00000000:00000001:00000000  
virt\_caps : hvm  
total\_memory : 32759  
free\_memory : 165  
free\_cpus : 0  
max\_free\_memory : 31887  
max\_para\_memory : 31883  
max\_hvm\_memory : 31800  
xen\_major : 4  
xen\_minor : 1  
xen\_extra : .2\_14-0.5.5  
xen\_caps : xen-3.0-x86\_64 xen-3.0-x86\_32p hvm-3.0-x86\_32 hvm-3.0-x86\_32p hvm-3.0-x86\_64  
xen\_scheduler : credit  
xen\_pagesize : 4096  
platform\_params : virt\_start=0xffff800000000000  
xen\_changeset : 23174  
xen\_commandline : vga=mode-0x31a  
cc\_compiler : gcc version 4.3.4 [gcc-4\_3-branch revision 152973] (SUSE Linux)  
cc\_compile\_by : abuild  
cc\_compile\_domain :  
cc\_compile\_date : Wed Feb 15 18:12:45 UTC 2012  
xend\_config\_format : 4

So I can see my 32Gb of RAM  
This mean that only 20GB is allocated to dom0  
Possible to configure this memory allocated to dom0?

Thanks for your time  
jko

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<div class="post-metadata">

**Author:** ![KEVIN1](https://avatars.discourse-cdn.com/v4/letter/k/a9adbd/32.png) [@KEVIN1](https://forums.suse.com/u/KEVIN1)\
**Post date:** [April 23, 2013, 6:21pm UTC](https://forums.suse.com/t/question-on-memory-usage/23886/4 "2013-04-23T18:21:28Z")

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jkostic wrote:  
[color=blue]

> So I can see my 32Gb of RAM  
> This mean that only 20GB is allocated to dom0  
> Possible to configure this memory allocated to dom0?[/color]

This TID discusses Dom0 memory allocation  
[http://www.novell.com/support/kb/doc.php?id=3559698](http://www.novell.com/support/kb/doc.php?id=3559698)

–  
Kevin Boyle - Knowledge Partner  
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