Optimizing the ASC WAN Evaluating Network Performance Tools

Sandia is a multiprogram laboratory operated by Sandia Corporation, a Lockheed Martin Company,

Optimizing the ASC WAN:Evaluating Network Performance Tools for Comparing Transport ProtocolsAugust 7th, 2007 Christopher Lydick Graduate Student Intern Dept. 09336: Advanced Networking Integration

Sandia is a multiprogram laboratory operated by Sandia Corporation, a Lockheed Martin Company, for the United States Department of Energy’s National Nuclear Security Administration under contract DE-AC04-94AL85000.

Agenda Introduction Laboratory Configuration Analysis and Evaluation Conclusions& Future Work References

Sandia is a multiprogram laboratory operated by Sandia Corporation, a Lockheed Martin Company,

Introduction Background– What is the ASC WAN?

The ASC WANLLNL, CA LANL, NM

Blue Gene/L Red Storm

SNL, CA

SNL, NM

Sandia is a multiprogram laboratory operated by Sandia Corporation, a Lockheed Martin Company,

Introduction Background– What is the ASC WAN?– Transport Protocols

Transport Protocols TCP Byte-Oriented 3-Way Handshake Ordered Delivery of Data Cumulative ACKs Reliable Data Transfer

UDP Message-Oriented No Handshake Unordered Delivery of Data No use of ACK/SACKs Unreliable Data Transfer

SCTP Message-Oriented 4-Way Handshake Ordered or Unordered Delivery of Data Uses SACKs to report exact condition of sender Reliable Data Transfer

Best of the three for ASC WAN

Sandia is a multiprogram laboratory operated by Sandia Corporation, a Lockheed Martin Company,

Introduction Background– What is the ASC WAN?– Transport Protocols– Available Network Performance Tools Iperf (Internet Performance) Netperf (Network Performance)

– Available SCTP Libraries LKSCTP STREAMS

Laboratory ConfigurationNetwork Emulator

Client

Server

Sandia is a multiprogram laboratory operated by Sandia Corporation, a Lockheed Martin Company,

Analysis and Evaluation Analysis done using 4 Metrics– How effectively can the tool reach a throughput near the bandwidth?– How much of the CPU does the tool utilize during operation?– Is the tool freely and widely available?– Is the tool actively developed? To what extent?

Analysis and Evaluation Grades Given for the 4 metrics of A/B/C/D/F (A=Excellent…F=Fail), varying RTT values.Grade A B C D F Avg. Bandwidth>= 900 Mb/s 800-899 Mb/s 700-799 Mb/s 600-699 Mb/s<= 599 Mb/s Avg. CPU Utilization<= 19% 20-39% 40-59% 60-79%>= 80%

Sandia is a multiprogram laboratory operated by Sandia Corporation, a Lockheed Martin Company,

Analysis and Evaluation What is the maximum theoretical SCTP throughput on a 1Gb/s connection?

DATA PAYLOAD9018 Bytes 8952 Bytes Ethernet Header/ CRC IP Header SCTP Common Header SCTP Chunk Header

Maximum Theoretical Throughput: (8952÷ 9018)*1000= 992.6 Mb/sec

Analysis and Evaluation What is the maximum theoretical TCP throughput on a 1Gb/s connection?

DATA PAYLOAD9010 Bytes 8952 Bytes Ethernet Header/ CRC IP Header TCP Common Header

Maximum Theoretical Throughput: (8952÷ 9010)*1000= 993.6 Mb/sec

Sandia is a multiprogram laboratory operated by Sandia Corporation, a Lockheed Martin Company,

Analysis and Evaluation: Iperf 2.0.6 (LKSCTP)959 Mb/s 740 Mb/s

Figure: Iperf Throughput Results

Figure: Iperf CPU Results

Average SCTP Throughput: Average SCTP CPU Utilization: Average TCP Throughput: Average TCP CPU Utilization:

816 Mb/s (82.2% efficient) 71% 952 Mb/s (95.8% efficient) 32%

Analysis and Evaluation: Netperf 2.4.3 (LKSCTP)977 Mb/s

481 Mb/s

Figure: Netperf Through

put Results

Figure: Netperf CPU Results

Average SCTP Throughput: Average SCTP CPU Utilization: Average TCP Throughput: Average TCP CPU Utilization:

629 Mb/s (63.4% efficient) 73% 961 Mb/s (96.7% efficient) 31%

Sandia is a multiprogram laboratory operated by Sandia Corporation, a Lockheed Martin Company,

Analysis and Evaluation: Netperf 2.4.6-patched (STREAMS)965 Mb/s

Figure: Netperf-patched Throughput Results

Figure: Netperf-patched CPU Results

Average SCTP Throughput: Average SCTP CPU Utilization: Average TCP Throughput: Average TCP CPU Utilization:

963 Mb/s (97.0% efficient) 88% undefined undefined

ConclusionVariations within the tools make it difficult to find the optimal test tool for comparing transport protocols on the ASC WAN. Iperf 2.0.6 (LKSCTP) Netperf 2.4.3 (LKSCTP) Netperf 2.4.6-patched (STREAMS)

Sandia is a multiprogram laboratory operated by Sandia Corporation, a Lockheed Martin Company,

Future Work Is there any hardware assistance available for SCTP, like there is for TCP? An analysis of LKSCTP and STREAMS implementation could be helpful. Evaluate other testing tools: STT& sctpperf Re-evaluate the test tools in terms of other metrics

– Varying Message Sizes– Popularity– Accuracy– Others?

References[1] Krishnamurthy, et al. Using SCTP to Improve QoS and Network Fault-Tolerance of DRE Systems. Real-Time and Embedded Systems Workshop, July 2004.[2] R. Stewart, Q. Xie. Stream Control Transmission Protocol (SCTP) A Reference Guide.© 2002 Addison-Wesley.[3] C. Lydick. Optimizing the ASC WAN: Evaluating Network Performance Tools for Comparing Transport Protocols. Technical Report SAND2007-4526, Sandia National Laboratories, July 2007.[4] Flavius Copaciu, Virgil Dobrota, Tudor Blaga, and Bagdan Moraru. Performance analysis of stream transmission control protocol. In Symposium of Electronics and Telecommunications (ETC2004). Technical University of Cluj-Napoca, 2004.[5] Judy I. Beiriger, Hugh P. Bivens, Steven L. Humphreys, Wilbur R. Johnson, and Ronald E. Rhea. Constructing the asci computational grid. In IEEE Inte …… 此处隐藏：4040字，全部文档内容请下载后查看。喜欢就下载吧 ……