balance more fair when there are several servers with equal weights,
side effect: now smallest weights go first

src/http/ngx_http_upstream_round_robin.c

diff --git a/src/http/ngx_http_upstream_round_robin.c b/src/http/ngx_http_upstream_round_robin.c
index 4f017f9..d0911a0 100644
--- a/src/http/ngx_http_upstream_round_robin.c
+++ b/src/http/ngx_http_upstream_round_robin.c
@@ -498,7 +498,7 @@
                 }
 
                 if (peer[n].current_weight * 1000 / peer[i].current_weight
-                    >= peer[n].weight * 1000 / peer[i].weight)
+                    > peer[n].weight * 1000 / peer[i].weight)
                 {
                     return n;
                 }