Due to a sizeable number of our servers still having only 1G NICs we run into issues with live-migrating some instances with a lot of RAM and high memory activity (i.e. that the services cause memory changes at a higher rate than it can be migrated off to a new node).

There are two qemu options which should help here and which we could evaluate:

1. XBZRLE (Xor Based Zero Run Length Encoding):

https://github.com/qemu/qemu/blob/master/docs/xbzrle.txt

2. auto-converge:

https://wiki.qemu.org/Features/AutoconvergeLiveMigration