northd: Mark most of the SB columns as write-changed-only.

This uses the newly added ovsdb_idl_set_write_changed_only_all() to
explicitly disable atomicity checks for read/write columns and to enable
optimizing the process of building the SB transaction.

Bump OVS submodule to pick up d94cd0d3eec3 ("ovsdb-idl: Support
write-only-changed IDL monitor mode.").

Reported-at: https://bugzilla.redhat.com/show_bug.cgi?id=2069623
Signed-off-by: Dumitru Ceara <dceara@redhat.com>
Signed-off-by: Han Zhou <hzhou@ovn.org>

northd/ovn-northd.c

@@ -723,10 +723,18 @@ main(int argc, char *argv[])
     unixctl_command_register("nb-connection-status", "", 0, 0,
                              ovn_conn_show, ovnnb_idl_loop.idl);
 
-    /* We want to detect all changes to the ovn-sb db. */
+    /* We want to detect all changes to the ovn-sb db so enable change
+     * tracking but, for performance reasons, and because northd
+     * reconciles all database changes, also configure the IDL to only
+     * write columns that actually change value.
+     */
     struct ovsdb_idl_loop ovnsb_idl_loop = OVSDB_IDL_LOOP_INITIALIZER(
         ovsdb_idl_create(ovnsb_db, &sbrec_idl_class, true, true));
     ovsdb_idl_track_add_all(ovnsb_idl_loop.idl);
+    ovsdb_idl_set_write_changed_only_all(ovnsb_idl_loop.idl, true);
+
+    /* Disable alerting for pure write-only columns. */
+    ovsdb_idl_omit_alert(ovnsb_idl_loop.idl, &sbrec_sb_global_col_nb_cfg);
 
     unixctl_command_register("sb-connection-status", "", 0, 0,
                              ovn_conn_show, ovnsb_idl_loop.idl);