You may read about ballooning in VMware. A document is here http://www.vmware.com/files/pdf/perf-vsphere-memory_management.pdf I use XEN 4.1.2 and build domain-0 and a virtual machine in HVM mode both with kernel 3.0.23. When I boot the VM with "xm create.... " at the terminal. I see in xend.log messages about ballooning and some free pages reclaim by XEN. I think these pages belong to domain-0 because message is "Balloon: setting dom0 target to 1857 MiB." . Has anyone ever used the ballooning to free unused pages in XEN''s Domain U HVM ? How can call ballooning while Domain-U HVM is running to reclaim its free pages to XEN. Any guidance will useful. _______________________________________________ Xen-users mailing list Xen-users@lists.xen.org http://lists.xen.org/xen-users