Quality of Service Differentiation. Dr. Edward Chow CS 522, UCCS Fall 2004 Humzah Jaffar. What is QoS?. Related to a stream of packets from a source to a destination QoS determined by these quality of these parameters of the stream (low, medium, high): Reliability Delay Jitter Bandwidth.
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Dr. Edward Chow
CS 522, UCCS Fall 2004
wakeup policy is the same as above.
Ti(k) = 1 / (μi(k) - λi(k))
But Σμi(k) = 1 (i from 1 to N, number of classes)
Also, for proportional differentiation, Ti(k)/Tj(k) = δi/δj
Derive: Ti(k) ≡ δi/λ
M/M/1 Queue (3)
Start service time
input -> sw :: StaticSwitch($checksum_p);
sw -> CheckIPHeader2 -> output;
sw -> CheckIPHeader -> output;
c1 :: MaybeChecksum(0); // uses CheckIPHeader2
c2 :: MaybeChecksum(1); // uses CheckIPHeader
3 priority levels, highest
priority rate limited to no
more than 30,000 packets/
second. Measured per-
priority forwarding rates
at a range of input rates.