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Fair Queueing example

F=1.5+2. A. B. C. A. . . 1. 1/3. 1/3. Fair Queueing example. Time :. 0. 1. 2. 3. 4. 5. 6. 7. 8. Arrivals : (flow.len) F=finish #. A.1 B.2 C.2. F=0+1 F=0+2 F=0+2. A.2. Remember Inactive: F i = R + L Active: F i = F i -1 + L Active until R = F i

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Fair Queueing example

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  1. F=1.5+2 A B C A ... ... 1 1/3 1/3 Fair Queueing example Time: 0 1 2 3 4 5 6 7 8 Arrivals: (flow.len) F=finish # A.1 B.2 C.2 F=0+1 F=0+2 F=0+2 A.2 Remember Inactive: Fi = R + L Active: Fi = Fi-1 + L Active until R=Fi dR/dt = 1/(# active) Transmissions: Active flows: A B C 4 3 Round number (black) + colouredfinish numbers: 2 1/2 1 0 10/06/2014 Tim Moors 9751Y2 Example based on Keshav p. 241

  2. A1 ... ... Fair Queueing example 2 Time: 0 1 2 3 4 5 6 7 8 Remember Inactive: Fi = R + L Active: Fi = Fi-1 + L Active until R=Fi dR/dt = 1/(# active) Arrivals: (flowi) F=finish # A1 B1 C1 F=1 F=1 F=1 A2 F=2 B2 F=2 D1 F=15/6 Transmissions: B1 C1 D1 A2 B2 A Because connections (e.g. A&B) remain active until the end of the round, not just until they finish transmitting, packets from previously inactive conn’s (e.g. D1) may be served before others that arrived before them (e.g. A2, B2). B 3 Round number (black) + colouredfinish numbers: 1/2 2 1/3 (52/3,15/6) D inactive 1/4 1 1/3 (31/6,1) C becomes inactive (21/2,5/6) D becomes active 0 10/06/2014 Tim Moors 9751CZ

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