net: cache IPv6 zone information for applications using IPv6 link-local address
This change reduces the overhead of calling routing information per IPv6
link-local datagram read by caching IPv6 addressing scope zone
information.
Fixes #15237.
name old time/op new time/op delta
UDP6LinkLocalUnicast-8 64.9µs ± 0% 18.6µs ± 0% -71.30%
name old alloc/op new alloc/op delta
UDP6LinkLocalUnicast-8 11.2kB ± 0% 0.2kB ± 0% -98.42%
name old allocs/op new allocs/op delta
UDP6LinkLocalUnicast-8 101 ± 0% 3 ± 0% -97.03%
Change-Id: I5ae2ef5058df1028bbb7f4ab32b13edfb330c3a7
Reviewed-on: https://go-review.googlesource.com/21952
Reviewed-by: Ian Lance Taylor <iant@golang.org>
diff --git a/src/net/udpsock_test.go b/src/net/udpsock_test.go
index 1da24b2..29d769c 100644
--- a/src/net/udpsock_test.go
+++ b/src/net/udpsock_test.go
@@ -12,6 +12,43 @@
"time"
)
+func BenchmarkUDP6LinkLocalUnicast(b *testing.B) {
+ testHookUninstaller.Do(uninstallTestHooks)
+
+ if !supportsIPv6 {
+ b.Skip("IPv6 is not supported")
+ }
+ ifi := loopbackInterface()
+ if ifi == nil {
+ b.Skip("loopback interface not found")
+ }
+ lla := ipv6LinkLocalUnicastAddr(ifi)
+ if lla == "" {
+ b.Skip("IPv6 link-local unicast address not found")
+ }
+
+ c1, err := ListenPacket("udp6", JoinHostPort(lla+"%"+ifi.Name, "0"))
+ if err != nil {
+ b.Fatal(err)
+ }
+ defer c1.Close()
+ c2, err := ListenPacket("udp6", JoinHostPort(lla+"%"+ifi.Name, "0"))
+ if err != nil {
+ b.Fatal(err)
+ }
+ defer c2.Close()
+
+ var buf [1]byte
+ for i := 0; i < b.N; i++ {
+ if _, err := c1.WriteTo(buf[:], c2.LocalAddr()); err != nil {
+ b.Fatal(err)
+ }
+ if _, _, err := c2.ReadFrom(buf[:]); err != nil {
+ b.Fatal(err)
+ }
+ }
+}
+
type resolveUDPAddrTest struct {
network string
litAddrOrName string
