serverConfig := testConfig.Clone()
			serverConfig.DynamicRecordSizingDisabled = dynamicRecordSizingDisabled
			srv := Server(&slowConn{sconn, bps}, serverConfig)
			if err := srv.Handshake(); err != nil {
				panic(fmt.Errorf("handshake: %v", err))
			}
			io.Copy(srv, srv)
		}
	}()

	clientConfig := testConfig.Clone()
	clientConfig.DynamicRecordSizingDisabled = dynamicRecordSizingDisabled

func runDynamicRecordSizingTest(t *testing.T, config *Config) {
	clientConn, serverConn := localPipe(t)

	serverConfig := config.Clone()
	serverConfig.DynamicRecordSizingDisabled = false
	tlsConn := Server(serverConn, serverConfig)

	handshakeDone := make(chan struct{})
	recordSizesChan := make(chan []int, 1)
	defer func() { <-recordSizesChan }() // wait for the goroutine to exit

	// or use the GODEBUG=tlskyber=0 environment variable.
	CurvePreferences []CurveID

	// DynamicRecordSizingDisabled disables adaptive sizing of TLS records.
	// When true, the largest possible TLS record size is always used. When
	// false, the size of TLS records may be adjusted in an attempt to
	// improve latency.
	DynamicRecordSizingDisabled bool

	// Renegotiation controls what types of renegotiation are supported.

pkg crypto/tls, const RenegotiateNever RenegotiationSupport
pkg crypto/tls, const RenegotiateOnceAsClient = 1
pkg crypto/tls, const RenegotiateOnceAsClient RenegotiationSupport
pkg crypto/tls, type Config struct, DynamicRecordSizingDisabled bool
pkg crypto/tls, type Config struct, Renegotiation RenegotiationSupport
pkg crypto/tls, type RenegotiationSupport int
pkg crypto/x509, func SystemCertPool() (*CertPool, error)

// In the interests of simplicity and determinism, this code does not attempt
// to reset the record size once the connection is idle, however.
func (c *Conn) maxPayloadSizeForWrite(typ recordType) int {
	if c.config.DynamicRecordSizingDisabled || typ != recordTypeApplicationData {
		return maxPlaintext
	}

	if c.bytesSent >= recordSizeBoostThreshold {
		return maxPlaintext
	}

	// Subtract TLS overheads to get the maximum payload size.

		{"Config.CipherSuites", Field, 0},
		{"Config.ClientAuth", Field, 0},
		{"Config.ClientCAs", Field, 0},
		{"Config.ClientSessionCache", Field, 3},
		{"Config.CurvePreferences", Field, 3},
		{"Config.DynamicRecordSizingDisabled", Field, 7},
		{"Config.GetCertificate", Field, 4},
		{"Config.GetClientCertificate", Field, 8},
		{"Config.GetConfigForClient", Field, 8},
		{"Config.InsecureSkipVerify", Field, 0},