Re: [Xen-users] Memory Ballooning / Overcommitting

[Chris Hane <chrishane@xxxxxxxxx>]

Matt Ayres wrote:
> Robert Read wrote:
> > On Jul 17, 2008, at 16:35 , Chris Hane wrote:
> >
> > > I have a xen server setup that I want to install a lot of vms on if 
> > > possible.  The vms will have no utilization for the most part; and 
> > > brief utilization when active.  The server has 2GB of RAM.
> > > We were running into a problem were the dom0 would not let us add 
> > > anymore vms because we were out of physical memory.
> > > I have started to read about memory ballooning and hoping someone 
> > > could point me in the right direction.  If my understanding is 
> > > correct, ballooning will increase the vm memory if needed up to a 
> > > maxmem setting. And can decrease memory if requested by the dom0.
> > > Is this an automatic process, or do I have to manually issue a 
> > > command to increase/decrease the domU memory?  The command I know 
> > > about is:
> > > > xm mem-set <Domain> <Mem>
> > There is no automatic process for increasing guest memory, yet. As 
> > Mark mentioned yesterday there are some patches floating around to do 
> > this if someone wants to try it out.
> xenballoond was committed to xen-unstable for the next release.  It was 
> designed for pretty much this exact reason.
> Details: 
> http://wiki.xensource.com/xenwiki/Open_Topics_For_Discussion?action=AttachFile&do=get&target=Memory+Overcommit.pdf 
Thanks for the information.  This could be why I couldn't find any 
information about automatic ballooning  :)
Chris....

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