An example service curve

time

Si(t)

a

b

T

• Suppose pi1 arrives at time 0, and is of length li1

• The delay guarantee:
  • If li1 ? T tan a, then delay ? li1 / tan a else delay ? T + (li1 - T tan a)/ tan b

• To get a lower delay guarantee,
  • increase a -- decrease delay for packets of all sizes
  • increase T -- decrease delay for large packets
  • increase b -- decrease delay for large packets (but increase bandwidth share as well)

T tan a

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