[CentOS] 2.6.18-92.1.6.el5xen -- 8GB missing?

Ruslan Sivak russ at vshift.com
Sun Jul 13 03:50:14 UTC 2008

Victor Padro wrote:
> On Sat, Jul 12, 2008 at 7:11 PM, JJB <jack at internetguy.net 
> <mailto:jack at internetguy.net>> wrote:
>     Hello,
>     Last night I upgraded a server to CentOS 5.2.  The server has 16GB of
>     RAM.  Now that it's running 2.6.18-92.1.6.el5xen only 8GB is
>     reported to
>     exist.
>     ...snip...
>     How much memory is available?  Is this a known issue?
> I think there was a topic like this about a month ago, please search 
> the list archieves.
> Cheers.

In case he didn't find it, I was the one that posted the original 
issue.  Turns out that Xen allocates memory to domU's and doesn't 
release it back to dom0 even if you stop the VM's.  Top only reports the 
memory available to dom0.  The xen tools will show the proper amount of 


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