net: fix slow network interface manipulations
This CL reduces unnecessary network facility lookups introduced
by recent changes below.
changeset: 15798:
53a4da6a4f4a
net: return correct point-to-point interface address on linux
changeset: 15799:
a81ef8e0cc05
net: set up IPv6 scoped addressing zone for network facilities
Also adds a test case for issue 4839.
Benchmark results on linux/amd64, virtual machine:
benchmark old ns/op new ns/op delta
BenchmarkInterfaces-2 80487 80382 -0.13%
BenchmarkInterfaceByIndex-2 72013 71391 -0.86%
BenchmarkInterfaceByName-2 79865 80101 +0.30%
BenchmarkInterfaceAddrs-2 42071 829677 +1872.09%
BenchmarkInterfacesAndAddrs-2 35016 607622 +1635.27%
BenchmarkInterfacesAndMulticastAddrs-2 169849 169082 -0.45%
old: 15797:
9c3930413c1b, new: tip
Benchmark results on linux/amd64, virtual machine:
benchmark old ns/op new ns/op delta
BenchmarkInterfaces-2 80487 81459 +1.21%
BenchmarkInterfaceByIndex-2 72013 71512 -0.70%
BenchmarkInterfaceByName-2 79865 80567 +0.88%
BenchmarkInterfaceAddrs-2 42071 120108 +185.49%
BenchmarkInterfacesAndAddrs-2 35016 33259 -5.02%
BenchmarkInterfacesAndMulticastAddrs-2 169849 82391 -51.49%
old: 15797:
9c3930413c1b, new: tip+CL7400055
Benchmark results on darwin/amd64:
benchmark old ns/op new ns/op delta
BenchmarkInterfaces-2 34402 34231 -0.50%
BenchmarkInterfaceByIndex-2 13192 12956 -1.79%
BenchmarkInterfaceByName-2 34791 34388 -1.16%
BenchmarkInterfaceAddrs-2 36565 63906 +74.77%
BenchmarkInterfacesAndAddrs-2 17497 31068 +77.56%
BenchmarkInterfacesAndMulticastAddrs-2 25276 66711 +163.93%
old: 15797:
9c3930413c1b, new: tip
Benchmark results on darwin/amd64:
benchmark old ns/op new ns/op delta
BenchmarkInterfaces-2 34402 31854 -7.41%
BenchmarkInterfaceByIndex-2 13192 12950 -1.83%
BenchmarkInterfaceByName-2 34791 31926 -8.23%
BenchmarkInterfaceAddrs-2 36565 42144 +15.26%
BenchmarkInterfacesAndAddrs-2 17497 17329 -0.96%
BenchmarkInterfacesAndMulticastAddrs-2 25276 24870 -1.61%
old: 15797:
9c3930413c1b, new: tip+CL7400055
Update #4234.
Fixes #4839 (again).
Fixes #4866.
R=golang-dev, fullung
CC=golang-dev
https://golang.org/cl/
7400055