diff --git a/opencontrail40-upgrade.groovy b/opencontrail40-upgrade.groovy
index bf35d97..52a0d23 100644
--- a/opencontrail40-upgrade.groovy
+++ b/opencontrail40-upgrade.groovy
@@ -31,7 +31,7 @@
 def thirdPartyAnalyticsPkgsToRemove = 'redis-server,supervisor'
 //def cmpPkgs = ['contrail-lib', 'contrail-nodemgr', 'contrail-utils', 'contrail-vrouter-agent', 'contrail-vrouter-utils', 'python-contrail', 'python-contrail-vrouter-api', 'python-opencontrail-vrouter-netns', 'contrail-vrouter-dkms']
 def CMP_PKGS = 'contrail-lib contrail-nodemgr contrail-utils contrail-vrouter-agent contrail-vrouter-utils python-contrail python-contrail-vrouter-api python-opencontrail-vrouter-netns contrail-vrouter-dkms'
-def KERNEL_MODULE_RELOAD = 'service supervisor-vrouter stop;ifdown vhost0;rmmod vrouter;modprobe vrouter;ifup vhost0;service supervisor-vrouter start;'
+def KERNEL_MODULE_RELOAD = 'service supervisor-vrouter stop; rmmod vrouter; sync && echo 3 > /proc/sys/vm/drop_caches && echo 1 > /proc/sys/vm/compact_memory; service contrail-vrouter-agent start; service contrail-vrouter-nodemgr start'
 def analyticsServices = ['supervisor-analytics', 'supervisor-database', 'zookeeper', 'redis-server']
 def configServices = ['contrail-webui-jobserver', 'contrail-webui-webserver', 'supervisor-config', 'supervisor-database', 'zookeeper']
 def controlServices = ['ifmap-server', 'supervisor-control', 'redis-server']