slaves in order from most-loaded to least-loaded. If highly loaded
slave H is significantly more heavily loaded than the least-loaded
slave L, and slave H carries at least two hashes, then vswitchd shifts
-one of H's hashes to L. However, vswitchd will not shift a hash from
-H to L if that will cause L's load to exceed H's load.
+one of H's hashes to L. However, vswitchd will only shift a hash from
+H to L if it will decrease the ratio of the load between H and L by at
+least 0.1.
Currently, "significantly more loaded" means that H must carry at
least 1 Mbps more traffic, and that traffic must be at least 3%