It has been observed that when we upgrade openvswitch with
thousands of openflow flows already established and there is heavy
traffic going through the switch, restoring flows can take a very
long time (8 minutes in one use case) with CPU running at 100%.
This can make the upgrade very expensive.
This commit starts vswitchd with packet processing from the datapath
disabled. Once the flows are restored, it enables packet processing.
Bug #16086.
Signed-off-by: Gurucharan Shetty <gshe...@nicira.com>
---
utilities/ovs-ctl.in | 15 ++++++++++++++-
1 file changed, 14 insertions(+), 1 deletion(-)
diff --git a/utilities/ovs-ctl.in b/utilities/ovs-ctl.in
index 1f10491..127cd1b 100755
--- a/utilities/ovs-ctl.in
+++ b/utilities/ovs-ctl.in
@@ -330,6 +330,11 @@ init_restore_scripts () {
trap 'rm -f "${script_interfaces}" "${script_flows}" "${script_ofports}"' 0
}
+dpif_packet_receive () {
+ # Setting to enable or disable packet processing from datapath.
+ ovs_vsctl set open_vswitch . other_config:dpif-packet-receive="$1"
+}
+
force_reload_kmod () {
ifaces=`internal_interfaces`
action "Detected internal interfaces: $ifaces" true
@@ -370,9 +375,13 @@ force_reload_kmod () {
action "Removing openvswitch module" rmmod openvswitch
fi
+ # Start vswitchd with packet processing from datapath disabled.
+ dpif_packet_receive "false"
start_forwarding
+ # Restore saved flows and then enable packet processing from the datapath.
restore_flows
+ dpif_packet_receive "true"
restore_interfaces
@@ -414,10 +423,14 @@ restart () {
restore_ofports
stop_forwarding
+
+ # Start vswitchd with packet processing from datapath disabled.
+ dpif_packet_receive "false"
start_forwarding
- # Restore the saved flows.
+ # Restore saved flows and then enable packet processing from the datapath.
restore_flows
+ dpif_packet_receive "true"
# Restore the interfaces if required. Return true even if restore fails.
restore_interfaces || true
--
1.7.9.5
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