start := time.Now()
	req := testRequest{Num: 1, String: testPayload}
	resp, err := h1.Call(t.Context(), remoteConn, &req)
	errFatal(err)
	if resp.OrgString != testPayload {
		t.Errorf("want %q, got %q", testPayload, resp.OrgString)
	}
	t.Log("Roundtrip:", time.Since(start))
	h1.PutResponse(resp)

	start = time.Now()

			return append(GetByteBuffer()[:0], payload...), nil
		}))
		errFatal(rpc.Register(remote, func(req *testRequest) (resp *testResponse, err *RemoteErr) {
			return &testResponse{
				OrgNum:    req.Num,
				OrgString: req.String,
				Embedded:  *req,
			}, nil
		}))
		errFatal(err)
	}
	const payloadSize = 512
	rng := rand.New(rand.NewSource(time.Now().UnixNano()))
	payload := make([]byte, payloadSize)