From 537ba03dd1425da1abadb5dfe6d9a20e984c9cf0 Mon Sep 17 00:00:00 2001
From: Alexander Morozov <lk4d4@docker.com>
Date: Fri, 16 Oct 2015 11:33:17 -0700
Subject: [PATCH] Use netlink.LinkByName instead of net.InterfaceByName

It's x350 time faster.

Signed-off-by: Alexander Morozov <lk4d4@docker.com>
---
 libnetwork/netutils/utils.go | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/libnetwork/netutils/utils.go b/libnetwork/netutils/utils.go
index 7d90b1f52c..a1ead3618c 100644
--- a/libnetwork/netutils/utils.go
+++ b/libnetwork/netutils/utils.go
@@ -161,8 +161,8 @@ func GenerateIfaceName(prefix string, len int) (string, error) {
 		if err != nil {
 			continue
 		}
-		if _, err := net.InterfaceByName(name); err != nil {
-			if strings.Contains(err.Error(), "no such") {
+		if _, err := netlink.LinkByName(name); err != nil {
+			if strings.Contains(err.Error(), "not found") {
 				return name, nil
 			}
 			return "", err