ovs-ctl.in: Increase the limit on file descriptors.

Testing shows that creation of 5000 internal ports and using it
to do some meaningful tasks works fine on a 12 cpu hardware.
Since a single port needs one file descriptor and a bridge
needs 3 file descriptors, we will have to increase the file
descriptor limit to a higher number from the current limit of 5000.
7500 feels like a decent increase with enough room for further
scale testing.

Bug #18383.
Signed-off-by: Gurucharan Shetty <gshetty@nicira.com>
Acked-by: Ben Pfaff <blp@nicira.com>

diff --git a/utilities/ovs-ctl.in b/utilities/ovs-ctl.in
index 6465fdf..0735160 100755 (executable)
--- a/utilities/ovs-ctl.in
+++ b/utilities/ovs-ctl.in
@@ -224,10 +224,10 @@ start_forwarding () {
         log_success_msg "ovs-vswitchd is already running"
     else
         # Increase the limit on the number of open file descriptors.
-        # On Linux, ovs-vswitchd needs about one file descriptor per
-        # switch port, so this allows a very large number of switch
-        # ports.
-        ulimit -n 5000
+        # On Linux, ovs-vswitchd needs about three file descriptors
+        # per bridge and one file descriptor per bridge port, so this
+        # allows a very large number of bridges and ports.
+        ulimit -n 7500
 
            # Start ovs-vswitchd.
            set ovs-vswitchd unix:"$DB_SOCK"

diff --git a/vswitchd/ovs-vswitchd.8.in b/vswitchd/ovs-vswitchd.8.in
index eebf088..9d68f5e 100644 (file)
--- a/vswitchd/ovs-vswitchd.8.in
+++ b/vswitchd/ovs-vswitchd.8.in
@@ -218,7 +218,7 @@ We believe these limits to be accurate as of this writing.  These
 limits assume the use of the Linux kernel datapath.
 .
 .IP \(bu
-\fBovs\-vswitchd\fR started through \fBovs\-ctl\fR(8) provides a limit of 5000
+\fBovs\-vswitchd\fR started through \fBovs\-ctl\fR(8) provides a limit of 7500
 file descriptors.  The limits on the number of bridges and ports is decided by
 the availability of file descriptors.  With the Linux kernel datapath, creation
 of a single bridge consumes 3 file descriptors and adding a port consumes