[ovs-dev] [PATCH] Document per-port round-robin during controller rate limiting.
blp at nicira.com
Tue Sep 22 16:33:44 UTC 2009
CC: Peter Balland <peter at nicira.com>
vswitchd/ovs-vswitchd.conf.5.in | 13 +++++++++++++
1 files changed, 13 insertions(+), 0 deletions(-)
diff --git a/vswitchd/ovs-vswitchd.conf.5.in b/vswitchd/ovs-vswitchd.conf.5.in
index 12fea6c..d41983e 100644
@@ -547,6 +547,19 @@ These settings configure how the virtual switch applies a ``token
bucket'' to limit the rate at which packets in unknown flows are
forwarded to the OpenFlow controller for flow-setup processing. This
feature prevents a single bridge from overwhelming a controller.
+In addition, when a high rate triggers rate limiting, Open vSwitch
+queues controller packets for each port, up to a total of \fIburst\fR
+packets across all ports on the bridge. A port queue balancing
+algorithm prevents a single port on a bridge from monopolizing the
+resources for forwarding packets for unknown flows on a given bridge.
+Open vSwitch maintains two such packet rate-limiters per bridge. One
+of these applies to packets sent up to the controller because they do
+not correspond to any flow. The other applies to packets sent up to
+the controller by request through flow actions. When both
+rate-limiters are filled with packets, the actual rate that packets
+are sent to the controller is up to twice the specified rate.
Limits the maximum rate at which packets will be forwarded to the
More information about the dev