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Justin Dolske, Gojko Babic, Arjan Durresi, Raj Jain

97-0833:Test Experiences and Modifications to Mean Frame Burst Size (MFBS) Section of Performance Testing Baseline Text. Justin Dolske, Gojko Babic, Arjan Durresi, Raj Jain The Ohio State University Contact: Jain@cse.ohio-state.edu http://www.cse.ohio-state.edu/~jain/. Overview. MFBS Review

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Justin Dolske, Gojko Babic, Arjan Durresi, Raj Jain

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  1. 97-0833:Test Experiences and Modifications to Mean Frame Burst Size (MFBS) Section of Performance Testing Baseline Text. Justin Dolske, Gojko Babic, Arjan Durresi, Raj Jain The Ohio State UniversityContact: Jain@cse.ohio-state.edu http://www.cse.ohio-state.edu/~jain/

  2. Overview • MFBS Review • MFBS Measurement Procedure and Calculation • Measurement Results and Analysis • Summary

  3. MFBS Review • MFBS is the maximum number of frames that each of the source can send at peak rate through switch without incurring any loss. • MFBS measures the data buffering capacity of the switch and its ability to handle back-to-back frames. • The baseline states that MFBS should be measured using k-to-1 configuration. • The experimental results indicate that the MFBS for various values of k can be obtained from the measured MFBS for one k.

  4. MFBS Measurement Procedure and Calculation Source 1 Source 2 Destination Source 3 Source 4 MFBS Test Configuration

  5. MFBS Measurement Procedure and Calculation (contd.) • First, measure MCBS, which is the largest number of back-to-back cells that the sources may send simultaneously without losses. • In order to measure MCBS: • Simultaneously generate fixed length bursts of back-to-back cells through all k VCCs. • Vary the burst length until cell loss is verified at least in one VCC. • Then based on MCBS results, calculate MFBS of frames with a given size.

  6. Traffic Configuration MCBS (per source) 2-to-1 9,050 cells 3-to-1 4,650 cells 4-to-1 3,050 cells Measurement Results for MCBS

  7. Config- 64B 1518B 9188B 64kB uration Frames Frames Frames Frames 2-to-1 434,368 434,148 431,836 393,216 3-to-1 223,168 223,146 220,512 196,608 4-to-1 146,368 145,728 137,820 131,072 MFBS [in Bytes] Calculated from Measured MCBS

  8. Analysis of Measurement Results • Given (measured) MCBS for k, MCBSfor j can be calculated as: MCBSj = MCBSk *(k-1)/(j-1) Use k = 2 to minimize the equipment needed. Configuration The Switch in each interval transmits: buffers: 2-to-1 1 1 3-to-1 1 2 4-to-1 1 3 i-to-1 1 i-1

  9. Traffic Characteristics • Type of VCCs: permanent virtual path connections, switched virtual path connections, permanent virtual channel connections, switch virtual channel connections; • VCCs established: between ports inside a network module, between ports on different network modules, between ports on different fabrics, some combination of previous cases; • Connection configuration: 2-to-1; • Frame length: 64 B, 1518 B, 9188 B, 64 kB;

  10. Summary • A procedure to obtain the MFBS is defined. • 2-to-1 configuration is sufficient • Detailed traffic characteristics are defined.

  11. Motion • Adopt the text of 97-0833 to replace section 3.5 of Performance Testing Baseline Text.

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