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Re: [Xen-users] Cannot see my memory - why?

To: Jeff Lane <dreadpiratejeff@xxxxxxxxx>
Subject: Re: [Xen-users] Cannot see my memory - why?
From: Kevin McKeon <kevin.w.mckeon@xxxxxxxxx>
Date: Sat, 25 Apr 2009 07:30:05 -0400
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Thanks for the details Jeff, that really clears things up a lot. I've only allocated 1GB of RAM to my 64bit Domain-0s and that's all that shows up with free, /etc/meminfo and top, but I can see all of my RAM using 'xm list'.

Thanks again

On Fri, Apr 24, 2009 at 2:25 PM, Jeff Lane <dreadpiratejeff@xxxxxxxxx> wrote:
Just to rehash what's already been said, Domain 0 is a paravirt VM in
reality, so the amount of ram you allocate to it is what you will see
when using local tools like free, /proc/meminfo, top, etc.

To see the full system ram, yoyu need to use the xm tools... and in
this case, 'xm info' which will show you all the system resources, as
opposed to the resources available to dom0.

Also, you have 16GB ram on the system... you probably already know
this, but  be aware that without a PAE enabled kernel (if you're using
32bit Xen) you'll only see 4GB of this.  PAE will allow you to use up
to 16, or maybe 32 (I don't remember what the upper limit for PAE
enabled  Xen is off the top of my head).

I always ran 64bit so that limit was never an issue...


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