Re: [Xen-users] Strange memory issue

[Zary Matej <matej.zary@xxxxxxxxx>]

>________________________________________
>From: xen-users-bounces@xxxxxxxxxxxxxxxxxxx 
>[xen-users-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Flavio 
>[fbcyborg@xxxxxxxxx]
>Sent: 07 December 2011 12:16
>To: xen-users@xxxxxxxxxxxxxxxxxxx
>Subject: [Xen-users] Strange memory issue
>
>Hello,
>
>I would like to ask you some clarification about the memory management in the
>XEN hypervisor, because I had some bad experiences using my PC when the dom0
>is running.
>
>I have 4GB of RAM on my system, and they are absolutely not faulty, so, when I
>boot with a "traditional" kernel, I can see them all if I perform a
>"cat /proc/meminfo"
>or "free", as regard the total amount of available memory.
>
>What happens here is that when I boot the same kernel, but using the xen.gz
>hypervisor, the total amount of RAM is less than 4 GB. The main reason why I am
>curious is that this value randomly changes. In practise, when booting
>the dom0,
>one time I can see 1,5GB of TOTAL RAM, once 1GB, once 3GB, and so on.
>
>For instance, this is what I see now:
>$ free
>             total       used       free     shared    buffers     cached
>Mem:       3225484    1669384    1556100
>
>$ cat /proc/meminfo |grep MemTotal
>MemTotal:        3225484 kB
>
>Furthermore, the amount of free RAM is making me worried, because, sometime
>if I perform some heavy load processing (e.g. kernel compilations) my system
>freezes, especially if Mozilla Firefox is open.
>
>Talking with a friend of mine, I deduced that the dom0 takes
>(reserves) a certain amount
>of RAM. Is it that correct? How does it work?
>Is there a way to rule this behaviour? Is it possible to tell the dom0
>how much RAM to
>take?
>
>I'm running Gentoo Linux x86_64 kernel 3.1.3.
>
>Thanks,
>
>--
>Flavio

This one might help eventually - Dom0 memory balooning.

http://wiki.xen.org/xenwiki/XenBestPractices


Regards

Matej 
_______________________________________________
Xen-users mailing list
Xen-users@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-users