bradh352 opened a new issue, #11930:
URL: https://github.com/apache/cloudstack/issues/11930

   ### The required feature described as a wish
   
   Current versions of libvirt support additional memory ballooning options of 
Free Page Reporting and autodeflate which in theory can help VMs effectively 
share physical memory.  At least with KVM, its not clear why memory 
overprovisioning toggles exist since this feature isn't enabled in the libvirt 
xml so no automatic ballooning will occur.
   
   Openstack's nova recently made this same change: 
https://github.com/openstack/nova/commit/cd401c5c1b5dcba739d69875795828e1be1d726b
   
   This feature was introduced all the way back in libvirt v6.9.0 (2020-11-02), 
so its not exactly a new feature.
   
   While this may not be of a benefit to true production workloads, we have a 
use-case where developers are spinning up environments to run large, but 
infrequent builds with VMs set to 256G+ memory, but they consume less than 1G 
most of the time.  It would be great to be able to better utilize the hardware 
resources for this usecase.
   
   


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