Define control domain memory inside XCP-ng.
Get current control domain memory definition.
$ sudo /opt/xensource/libexec/xen-cmdline --get-xen dom0_mem
dom0_mem=1840M,max:1840M
Define control domain memory.
$ sudo /opt/xensource/libexec/xen-cmdline --set-xen dom0_mem=1024M,max:1024M
Reboot operating system to apply changes.
$ sudo reboot
Verify settings.
$ sudo /opt/xensource/libexec/xen-cmdline --get-xen dom0_mem
dom0_mem=1024M,max:1024M
You can also use Xen Orchestra Web Interface for XenServer to alter control domain memory.
