Re: [Xen-users] Contending RAM

[Anthony Liguori <aliguori@xxxxxxxxxx>]

Andy Davidson wrote:
> Hi, guys --
>
> We make fairly extensive use of Xen on our QA and testing platform.  
> We like to pseudo-physically separate apache instances running 
> different release candidates of our software.
> This works well.  However, we could do with more ram in our 'child' 
> virtual machines.
> We have 4GB on each host computer.  We like to install 10 or so 
> virtual machines on each host.  This leaves each VM very resource 
> starved.  Since we only tend to hit environments on an ad-hoc basis, 
> we need the vms available, but a lot of resources get wasted as they 
> tend to be hit one after the other.
> Ideally, we'd like to content system ram - so each machine is 
> configured to have 1GB available.  This obviously means we need to 
> contend memory .. probably 3:1 (including the requirements of the 
> Dom-0). Is this possible ?
maxmem = 1024
memory = 256

When it comes time to use the VM you care about, use xm mem-set to 
increase it's memory to 1G (and after you're finished, decrease it back 
down to 256).
Regards,

Anthony Liguori

> cheers
> -a
>
>
> (sample config file from oru setup below)
>
> kernel = "/boot/vmlinuz-2.6.12.6-xenU"
> memory = 256
> name = "qa01"
> vif = [ 'ip=10.22.22.101' ]
> disk = ['file:/vm/p1/qa01.img,hda1,w','file:/vm/p1/qa01.swap,hda2,w']
> netmask="255.255.254.0"
> gateway="10.0.12.1"
> root = "/dev/hda1"
> extra = "4"
>
>
>
>
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