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High-Speed Transmission Evaluation of Gigabit Local Area Networks by Limiting Performance Model

High-Speed Transmission Evaluation of Gigabit Local Area Networks by Limiting Performance Model. Satoru Fujimoto, Kenji Tamura, Osanori Koyama and Yutaka Katsuyama. Graduate School of Engineering, Osaka Prefecture University. Background.

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High-Speed Transmission Evaluation of Gigabit Local Area Networks by Limiting Performance Model

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  1. High-Speed Transmission Evaluation of Gigabit Local Area Networks by Limiting Performance Model Satoru Fujimoto, Kenji Tamura, Osanori Koyama 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. What is the performance when existing hardware is replaced with the gigabit one?

  3. Objectives Many kinds of LAN performance analysis contain probability of communication occurrence of the clients: Poisson processes • - We have already proposed a limiting performance evaluation method • for client/server LANs. • Formulae to give a file transfer time have been derived. • The calculated values were in good agreement with measured ones in • 10 and 100Base LANs. In This Presentation, ... - The limiting performance evaluation method for the 10 and 100Base LANs was extended to the gigabit LAN evaluation. - High-speed transmission evaluation of gigabit LAN is described.

  4. What’s presented? We present (1). High-Speed Transmission Evaluation of Gigabit Local Area Networks -Transfer Time Analysis by Extending Limiting Performance Model: Formulae to Give the Limiting Performance -Classifying the LANs according to the Hub Types -Measured & Calculated Results (2). Performance Improvement Evaluation When replacing 100Base with 100/1000Base Products -Measured & Calculated Results

  5. LAN Configuration to be Evaluated IEEE 802.3 LAN CL1 Switching or Non-Switching CL2 Hub Server Congestion CLn CSMA/CD Back Pressure Pause Function 10Base-T 100Base-T 1000Base-T The Packet Flow is Controlled by Media:

  6. Classification of Hubs 100Base-T: Server 10Base-T: Clients Non-Switching (NSW) Switching (SW)

  7. Simultaneous Packet Transfer Model Point D 1 F a s t e r U p l o a d i n g P a t h S w i t c h i n g H u b P a c k e t u A d d r e s s CL 1 T a b l e S e r v e r CL 2 y 2 M A C C h i p CL 3 Point C CL n z T h e S a m e S p e e d y U p l o a d i n g P a t h 1 P o i n t B p a c k e t F I F O B u f f e r Point D 2

  8. Packet Flow to the Server Pause LAN C L 1 2 n Time : one packet transfer time Pause LAN: Packet flow is controlled by Pause function. : unit waiting time to take a packet out the buffer inside the hub

  9. Derived Formulae : Client number when 1000Mbps uploading capacity is exhausted

  10. Parameters in the Formulae Meaning Parameter n Client Number u Unit Packet Size Transfer Time to Send One t u Packet u Unit Waiting Time to x Establish the Link Slot Time for All Ethernet y 1 Data Rates Unit Waiting Time to Take a Packet out the Buffer in the Hub y 2 Transfer Time to Send One z Packet u inside the Hub

  11. Measured and Calculated Transfer Time Measured 10Base NSW 10Base BP 10Base Pause 100 10/100Base 100Base NSW 100Base BP 100Base Pause 100/1000Base SV2 100/1000Base SV1 Calculated 10 Transfer time (s) 1 100Mbps 100Mbps x 4=400Mbps 100Mbps x 3=300Mbps 0.1 0 2 4 6 8 10 Client number n

  12. t u Obtained Parameter Values Z LAN (msec) (msec) 10 1.200 0.080 NSW x 100 0.130 0.010 10 1.273 0.051 y BP =1460*8bits/10Mbps =1.2 ms (10Base) =1460*8bits/100Mbps =0.12 ms (100Base) 1 100 0.131 0.005 SW 10 1.226 0.028 y Pause 2 100 0.123 0.002 z 1 8 n 1.264 0.010 ≦ ≦ 10/100Base x 9 n 0.142 0.010 ≦ z 1 3 n 0.115 0.007 ≦ ≦ 100/1000Base Server1: with a PCI-bus speed of 64bit/33MHz y Server1 4 n 0.026 0.033 ≦ 2 z 1 4 n 0.115 0.006 ≦ ≦ 100/1000Base Server2: with a PCI-bus speed of 64bit/66MHz y Server2 5 n 0.014 0.030 ≦ 2

  13. Throughput Improvement with Gigabit Technology 100Base Pause Hub CL1 64bit/33MHz PCI-Bus Speed CL2 Hub Server CLn Replace this with Replace this with 64bit/66MHz PCI-Bus Speed Server 100/1000Base Hub Pause Hub: Packet flow is controlled by Pause function.

  14. Throughput Improvement 100 Measured 80 100Base Pause 100/1000Base SV1 100/1000Base SV2 60 Calculated Throughput (Mbps) Improve- ment 40 20 0 2 4 6 8 10 Client number n

  15. Conclusion (1). The limiting performance evaluation method for the 10 and 100Base LANs was extended so as to evaluate different types of LANs. - Performance Evaluation Based on the Limiting Performance Model - Simple & Useful Formulae, Including 10, 100, 10/100, 100/1000Base Hubs - Good Agreement with Measured Values (2). A high-speed transmission of gigabit LAN has been evaluated theoretically and experimentally.

  16. ( 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

  17. Simultaneous Packet Transfer Model for the Evaluation: CSMA/CD LAN Point A x N o n - S w i t c h i n g H u b P a c k e t u M A C C h i p U p l o a d i n g P a t h S e r v e r X X X P a c k e t B u f f e r

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