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Limiting Performance Evaluation of Client/Server Local Area Networks based on Transfer Time under Traffic Congestion

Evaluate LAN performance through transfer time analysis and replacement of products for improved performance. Includes formulae, results, and throughput improvements.

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Limiting Performance Evaluation of Client/Server Local Area Networks based on Transfer Time under Traffic Congestion

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  1. Title Limiting Performance Evaluation of Client/Server Local Area Networks, Based on Transfer Time under Traffic Congestion Satoru Fujimoto, Kazue Tsujimura,Satoshi Hayashi, Jian Wang,and Yutaka Katsuyama Graduate School of Engineering, Osaka Prefecture University

  2. Background - The internet traffic increases rapidly year by year. - The network should be replaced with faster products. - What is the performance? Clients Congestion? Replacing 10 with 100 Base? Intranet System Server Hub We want to estimate the performance simply. How can we obtain better performance by the replacement?

  3. Objectives Many kinds of analysis have been reported to estimate LAN performance. However, ... Many of them contain probability of communication occurrence of the clients: Poisson processes As a result, ... Analyzed results are complicated and parameter values should be input to obtain the performance. We need simpler formulae in a limiting conditions: easy to estimate for non-professional users.

  4. What’s presented? We present (1). Limiting Performance of a LAN -Transfer Time Analysis under a Simultaneous Transfer Model: Formulae to Give the Limiting Performance -Measured & Calculated Results (2). Performance Improvement Evaluation When replacing 10Base with 100Base Products -Measured & Calculated Results

  5. LAN Configuration to be Evaluated CSMA/CD LAN CL1 CL2 Hub Server CLn Congestion 10Base-T 100Base-T

  6. x P a c k e t H u b u 1 0 B a s e 1 0 0 C L 1 C L 2 1 0 0 B a s e S e r v e r C L 3 C L 4 1 0 B a s e . . . . C L n x P a c k e t u 1 0 Packet Transfer Model for the Evaluation

  7. C L n t + ( n - 1 ) x u . . . . . . t t t t t t t t t t t t t t t t t t u u u u u u u u u u u u u u u u u u . . . . . . . . . . . . . . . . . . . . . . . . . . . . Packet Flow to Server 1 x x x x x x x 2 x x x x x x x n x x x x x x x Time : one packet transfer time : processing time between packets

  8. Formulae LAN Formulae 10Base 100Base 1 n 8 ≦ ≦ 10/100Base 9 n ≦ : one packet transfer time : processing time between packets

  9. ( 2 ) . S t a r t i n g ( 1 ) . I n i t i a l ( 3 ) . F T P T r a n s f e r M e a s u r e m e n t S e t t i n g & M e a s u r e m e n t C l i e n t s ( 5 ) . S a v i n g . . . . . . . . ( 4 ) . S e n d i n g R e s u l t s Transfer Time Measurement Tool CL1 Controller FTP Server CLn

  10. Transfer Time Measurement by the Tool Measurement Program Controller ①Start ①Start ②Search Search Button ③Detect ④Client Ready ⑥Measurement Starts ⑤Condition Input

  11. Measured values are displayed in each client window. Measurement Result Display

  12. Measured and Calculated Transfer Time -1 10 Base LAN 200 Measured Calculated Client Number 150 1 2 3 4 Transfer Time (s) 100 5 6 7 8 50 0 0 5 10 15 20 File Size F (MB)

  13. Measured and Calculated Transfer Time -2 100Base LAN 16 Measured Calculated Client Number 12 1 2 3 4 Transfer Time (s) 5 6 8 7 4 0 0 5 10 15 20 File Size F (MB)

  14. Obtained Parameter Values LAN t (msec) x (msec) u 10Base 1.207 - 0.575 - 100Base - 0.134 - 0.028 1 n 8 1.240 - - 0.023 ≦ ≦ 10/100Base 9 n - 0.134 - 0.028 ≦ =1460*8bits/10Mbps=1.2 ms (10Base) =0.12 ms (100Base)

  15. Throughput Improvement with Replacement CL1 10Base Hub CL2 Hub Server CLn 10/100Base Hub Replace this with or 100Base Hub

  16. Throughput Improvement 10/100 Base Hub 10 8 Improvement Measured 6 Calculated Throughput (Mbps) 10Base 4 10/100Base 2 0 0 2 4 6 8 10 Client Number n

  17. Throughput Improvement 100 Base Hub 100 100Base Measured 80 10Base 60 Throughput(Mbps) Improve- ment 40 Calculated 20 0 0 2 4 6 8 Client Number n

  18. Conclusion (1). Limiting performance of CSMA/CD LAN has been evaluated theoretically and experimentally. - Simultaneous Transfer Model - Simple & Useful Formulae - Good Agreement with Measured Values (2). Performance improvement by replacements has been evaluated quantitatively, based on the limiting performance approach.

  19. Obtained and Expected Parameter Values

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