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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Quality of Service Differentiation
Dr. Edward Chow
CS 522, UCCS Fall 2004
Humzah Jaffar
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
service time
Server (5)
Source (1)
M/M/1 Queue (3)
(2)
(4)
Pkt 1
Pkt 2
Pkt 3
Pkt 4
Pkt 5
Arrival time
Start service time
Departure time
Click Modular Router
FromDevice(eth0)
Counter
ToDevice(eth1)
input -> sw :: StaticSwitch($checksum_p);
sw[0] -> CheckIPHeader2 -> output;
sw[1] -> CheckIPHeader -> output;
};
c1 :: MaybeChecksum(0); // uses CheckIPHeader2
c2 :: MaybeChecksum(1); // uses CheckIPHeader
ScheduleInfo
RED(priority1)
Queue
IPClassifier
RED(priority2)
Queue
IPClassifier
PrioSched
Queue
RED(priority3)
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.