cmd/strelaysrv: Smaller, adjustable network buffer

cmd/strelaysrv/main.go

@@ -70,6 +70,7 @@ var (
 	descriptorLimit   int64
 	sessionLimiter    *rate.Limiter
 	globalLimiter     *rate.Limiter
+	networkBufferSize int
 
 	statusAddr       string
 	poolAddrs        string
@@ -108,6 +109,7 @@ func main() {
 	flag.IntVar(&natRenewal, "nat-renewal", 30, "NAT renewal frequency in minutes")
 	flag.IntVar(&natTimeout, "nat-timeout", 10, "NAT discovery timeout in seconds")
 	flag.BoolVar(&pprofEnabled, "pprof", false, "Enable the built in profiling on the status server")
+	flag.IntVar(&networkBufferSize, "network-buffer", 2048, "Network buffer size (two of these per proxied connection)")
 	flag.Parse()
 
 	if extAddress == "" {

cmd/strelaysrv/session.go

@@ -254,7 +254,7 @@ func (s *session) proxy(c1, c2 net.Conn) error {
 	atomic.AddInt64(&numProxies, 1)
 	defer atomic.AddInt64(&numProxies, -1)
 
-	buf := make([]byte, 65536)
+	buf := make([]byte, networkBufferSize)
 	for {
 		c1.SetReadDeadline(time.Now().Add(networkTimeout))
 		n, err := c1.Read(buf)