Posted on April 25, 2017 at 1:12 am

Configure Control Domain (dom0) RAM memory in XenServer 6.1.0 and later:

1) SSH login as root on the XenServer host

2) Enter the following command to increase the RAM to 4GB:

/opt/xensource/libexec/xen-cmdline --set-xen dom0_mem=4096M,max:4096M

3) Shutdown all running VMs to avoid data loss:

*** This command may not be recommended for a pooled server ***

xe vm-shutdown --multiple

4) Reboot XenServer host using XenCenter or reboot command on console

5) Wait 2 minutes that XenServer host has rebooted

On XenServer 7.1 you can change the RAM via XenCenter:
https://support.citrix.com/article/CTX220763

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