Re: [Xen-users] Cannot prevent memory reclamation from Dom0

[Anil Rao <anil.rao@xxxxxxxxxxxx>]

I think I might have resolved the issue. Since I am using xl (instead of xm) to manage my VMs, I believe some of the options in xend-config.sxp, such as dom0-min-mem and enable-dom0-ballooning are not relevant. So, in order to keep the memory allocation for dom0 at a fixed value of 1024 MB, I am now doing the following:

 

A) Set dom0_mem=1024m in grub.conf.

B) Set autoballoon=0 in /etc/xen/xl.conf.

 

With these settings my dom0 is kept at a steady size of 1024 MB, and when I try to start one to many domUs, I get the expected failure from 'xl create'.

 

Can someone confirm if I have got this right?

 

Thanks.

-Anil

 

---

I am trying to set up an environment where dom0 is provided with a fixed amount of memory (say 1024 MB)  that doesn't change as new domUs are started on the host. For this purpose I have done the following:

 

A) Set dom0_mem=1024m in grub.conf.

B) Set dom0-min-mem to 1024 in /etc/xen/xend-config.sxp.

C) Set enable-dom0-ballooning to 'no' in /etc/xen/xend-config.sxp.

 

As long the memory on the host is under-committed, dom0 gets its 1024 MB (as shown by xl list). However, when I start enough domUs, I notice that some memory gets reclaimed from dom0, to satisfy the incoming domU. However, this shouldn't be happening because of (B) and (C) above.

 

Are the dom0-min-mem  and enable-dom0-ballooning controls broken?

 

I am running Xen 4.0.1 with a CentOS 2.6.32 dom0.

 

Any thoughts/suggestions will be most appreciated.

 

Thanks.

-Anil

 

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