1.1.2.3. RTI Real-Time WAN Transport

Real-Time WAN Transport is a transport that enables secure, scalable, and high-performance communication over wide area networks (WANs), including public networks. It can be used to extend Connext DDS capabilities to WAN environments. Real-Time WAN Transport uses UDPv4 as the underlying IP transport-layer protocol to better anticipate and adapt to the challenges of diverse network conditions, device mobility, and the dynamic nature of WAN system architectures. For more information, see RTI Real-Time WAN Transport, in the RTI Connext DDS Core Libraries User’s Manual.

In the UDPv4_WAN section, you can find the latency and throughput that we can achieve when using Real-Time WAN Transport locally in a 1-to-1 scenario in a local area network. The tests below show how these numbers compare with the already existing UDPv4 transport. Notice that the performance is similar for both latency and throughput.

Unkeyed, Reliable, RWT vs UDPv4 over 10Gbps Network, C++98

The graph below shows the one-way latency without load between a Publisher and a Subscriber running in two Linux nodes connected locally in a 10Gbps network.

Test Hardware

The following hardware was used to perform these tests:

Linux Nodes

Processor: Intel® Xeon® E-2186G 3.8GHz, 12M cache, 6C/12T, turbo (95W)
RAM: 16GB 2666MT/s DDR4 ECC UDIMM
NIC 1: Intel X550 Dual Port 10GbE BASE-T Adapter, PCIe Full Height
NIC 2: Intel Ethernet I350 Dual Port 1GbE BASE-T Adapter, PCIe Low Profile
OS: Ubuntu 18.04 -- gcc (Ubuntu 7.5.0-3ubuntu1~18.04) 7.5.0

Switch

Dell Networking S4048T-ON, 48x 10GBASE-T and 6x 40GbE QSFP+ ports, IO to PSU air, 2x AC PSU, OS9

However, the Real-Time WAN Transport is not typically used for communication over a local area network. The following test was set between a Linux virtual machine from Amazon Web Services (AWS) in the servers located in Europe (Paris), eu-west-3 and a physical Linux node in RTI headquarters in Sunnyvale, California, US.

The test compares the performance of the Real-Time WAN Transport and the TCP Transport also available with Connext DDS.

Unkeyed, Reliable, RWT vs TCP over WAN (Europe to US), C++98

The graph below shows the one-way latency without load between a Publisher and a Subscriber running between two nodes. The publisher node is a virtual machine hosted by AWS located in Europe (Paris), eu-west-3, the subscriber node is located at RTI headquarters in Sunnyvale, California.

Detailed Statistics

The following tables contain the raw numbers presented by RTI Perftest. These numbers are the exact output with no further processing.

  • RWT

Sample Size (Bytes)

Avg (μs)

Std (μs)

Min (μs)

Max (μs)

50% (μs)

90% (μs)

99% (μs)

99.99% (μs)

99.9999% (μs)

32

73076

47.2

73010

73651

73070

73101

73175

73651

73651

64

73089

164.0

73015

75224

73069

73101

73207

75224

75224

128

73085

42.3

72996

73571

73080

73112

73159

73571

73571

256

73091

20.3

73017

73143

73090

73120

73136

73143

73143

512

73144

123.2

73090

74106

73124

73153

73914

74106

74106

1024

73190

32.9

73112

73512

73187

73215

73239

73512

73512

8192

73562

113.1

73473

74944

73542

73605

73801

74944

74944

63000

72575

299.8

72359

75679

72525

72660

73353

75679

75679

  • TCP

Sample Size (Bytes)

Avg (μs)

Std (μs)

Min (μs)

Max (μs)

50% (μs)

90% (μs)

99% (μs)

99.99% (μs)

99.9999% (μs)

32

84274

3702.7

70629

113898

84022

86225

110399

113898

113898

64

84585

4652.7

70866

113960

84068

86279

111978

113960

113960

128

85632

7582.2

70574

112153

84113

86548

112153

112153

112153

256

87209

11954.4

71027

111413

84189

102103

104820

111413

111413

512

84871

18530.1

70801

115744

84871

111838

115662

115744

115744

1024

108049

6351.9

71271

120726

108049

115556

116775

120726

120726

8192

108557

5648.0

70852

118075

108557

113005

116872

118075

118075

63000

118161

29605.1

98075

438836

115361

116945

180988

438836

438836

Test Hardware

The following hardware was used to perform these tests:

Local Node

Processor: Intel Core i7 CPU 3.33 GHz, 12M cache, Number of cores: 6 (12 threads)
RAM: 12GB DDR3
NIC 1: Intel I350 Gigabit NIC
OS: CentOS Linux release 7 gcc 4.8.2
Location: United States of America, California

AWS Machine

Kind: Ubuntu Server 20.04 LTS (HVM), SSD Volume Type
Processor: Intel(R) Xeon(R) CPU E5-2676 v3 @ 2.40GHz (1 core)
RAM: 1GB
Location: Europe (Paris), eu-west-3