add profiling support

main.go

@@ -8,10 +8,13 @@ import (
 	"log"
 	"math"
 	"net"
+	"net/http"
 	"net/netip"
 	"sync"
 	"syscall"
 
+	_ "net/http/pprof"
+
 	"golang.org/x/net/ipv4"
 	"golang.org/x/net/ipv6"
 )
@@ -270,6 +273,7 @@ func main() {
 	portInt := flag.Int("port", 8472, "port for vxlan communication")
 	mtuInt := flag.Uint("mtu", 1422, "buffer size")
 	buffersInt := flag.Int("buffers", 64, "number of buffers for I/O batching")
+	pprofBool := flag.Bool("pprof", false, "enable pprof http endpoint on http://localhost:6060")
 
 	flag.Parse()
 
@@ -295,6 +299,12 @@ func main() {
 		log.Fatalf("buffers < 1: %d", *mtuInt)
 	}
 
+	if *pprofBool {
+		go func() {
+			log.Println(http.ListenAndServe("localhost:6060", nil))
+		}()
+	}
+
 	if *buffersInt == 1 {
 		log.Println(vx46forward(natprefix, upstreamAddr, port, mtu))
 	} else {