[afnog] Xen can only see 2.9G of 8G RAM on Dell R200 with CentOS 5.5

[Shepherd Magumo]

Thanks Hugo, It's all starting to make sense, there 4 active DomU's.

I recently put up a SNMP used memory monitor on Dom0 after experiencing
performance issues. The monitor would hit roughly around 2.9GB and the
guests start slowing down in performance. So I assumed that was the total
mem.

Forgive me there, I am a xen newbie. So how would I best measure and graph
DomU's memory preferably from Dom0 without installing SNMP clients on the
guests?

On 29 April 2011 13:00, Hugo Lombard <hal at elizium.za.net> wrote:

> [Taking it back on-list...]
>
> On Fri, Apr 29, 2011 at 12:50:11PM +0200, Shepherd Magumo wrote:
> >
> >    The xm info returns:
> >
>
> [...]
>
> >    total_memory * * * * * : 8190
> >    free_memory * * * * * *: 1
>
> Looks like Xen is seeing all the memory.  Are you currently running
> DomU's on the box?  /proc/meminfo will report only the Dom0 memory,
> which shrinks when you start up DomUs, or is pre-shrunk if you boot the
> Dom0 with a 'dom0_mem=' parameter.
>
> --
> Hugo Lombard
>
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