diff --git a/nova_service/write_conf.sh b/nova_service/write_conf.sh
index a9b69e4..f68578f 100755
--- a/nova_service/write_conf.sh
+++ b/nova_service/write_conf.sh
@@ -20,6 +20,7 @@ allow_migrate_to_same_host = True
 allow_resize_to_same_host = True
 firewall_driver = nova.virt.firewall.NoopFirewallDriver
 enabled_apis=osapi_compute,metadata
+cpu_allocation_ratio = 4
 
 [neutron]
 url = http://$NEUTRON_CONTROLLER_HOST:9696