IEEE RPR Performance (Corner Cases)
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1 IEEE (Corner Cases), AmerNet Adisak Mekkittikul, Lantern Interim Meeting Orlando, FL
2 Motivation Need to simulate corner case scenarios and ensure that the proposed standard works under these conditions Ensure that we find a solution that has no fundamental weaknesses Compare some performance aspects of Gandalf to VoQ 2
3 Performance problems Oscillations due to reactive flow control Low bandwidth utilization with bursty traffic 3
4 Scenario #1 Dealing with Low priority Bursty Traffic Assume loaded ring Bursty traffic is being injected Bursty traffic will be modeled as periodic pulses 4
5 Scenario #1 Simple Hubbing with bursty traffic Bursty Low Priority Low Priority Over Loading the Ring 5
6 Scenario #1 Parameters Traffic Generation Parameters Site F (Heavy Loaded) Site D (Bursty) Start Time seconds ON State Time seconds OFF State Time seconds Packet Size bytes Traffic generated 800 Mbps 600 Mbps (OC12) 3 Gbps 600 Mbps (OC48) For Gandalf Decay Interval usec 6
7 Scenario #1 Traffic Generated for OC-12 Low priority bursty traffic generated at downstream node Low priority heavy traffic generated at upstream node 7
8 Scenario #1 (Gandalf ) Waveforms at Node D Traffic inserted at Node D Traffic forwarded at Node D Ring Size 100 Km Ring Speed OC-12 8
9 Scenario #1 (Gandalf ) Waveforms at Node D (zoom in) Traffic inserted at Node D Traffic forwarded at Node D Ring Size 100 Km Ring Speed OC-12 9
10 Scenario #1 Gandalf Utilization Results Low priority Bursty Traffic for OC-12 Utilization % 80.00% 60.00% 40.00% 20.00% 0.00% Ring Size (Km) 10
11 Scenario #1 Gandalf Utilization Results Low priority Bursty Traffic for OC % 80.00% Utilization 60.00% 40.00% 20.00% 0.00% Ring Size (Km ) 11
12 Explanation of Problem Burst of inserted traffic causes congestion This triggers reactive flow control message Panic backoff throttles upstream source to low value even though burst is gone Slow ramp up mechanism independent of traffic conditions Result: Low BW efficiency 12
13 Scenario #1 (VoQ) Waveforms at Node D Traffic inserted at Node D Traffic forwarded at Node D Ring Size 100 Km Ring Speed OC-12 13
14 Scenario #1 (VoQ ) Waveforms at Node D Traffic inserted at Node D Traffic forwarded at Node D Ring Size 100 Km Ring Speed OC-12 14
15 Scenario #1 VoQ Results OC-12 Utilization Utilization % 80.00% 60.00% 40.00% 20.00% 0.00% Ring Size (Km) 15
16 Scenario #1 VoQ Results OC-48 Utilization Utilization % 80.00% 60.00% 40.00% 20.00% 0.00% Ring Size (Km) 16
17 Scenario #3: High priority low intensity Assume loaded ring Add high priority traffic Low intensity Constant dist 17
18 Scenario #3 Setup High Priority Low Priority Over Loading the Ring 18
19 Scenario #3 Parameters Traffic Generation Parameters Site F (Low priority) Site D (High Priority) Start Time ON State Time OFF State Time 0 0 Packet Size Traffic generated 800 Mbps 50 Mbps (OC12) 3 Gbps 50 Mbps (OC48) For Gandalf Decay Interval usec 19
20 Scenario 3: Traffic Generated for OC48 Low priority traffic generated at upstream node High priority traffic generated at downstream node 20
21 Scenario 3: Traffic Generated for OC12 Low priority traffic generated at upstream node High priority traffic generated at downstream node 21
22 Scenario #3 Gandalf Results OC-12 Low Intensity High Priority 85.00% Utilization 80.00% 75.00% 70.00% 65.00% Ring Size (Km) 22
23 Scenario #3 Gandalf Results OC-48 Low Intensity High Priority 85.00% Utilization 80.00% 75.00% 70.00% 65.00% Ring Size (Km) 23
24 Scenario #3 VoQ Results OC-12 Low intensity High priority % Utilization 80.00% 60.00% 40.00% 20.00% 0.00% Ring Size (Km) 24
25 Scenario #3 VoQ Results OC-48 Low intensity High priority % Utilization 80.00% 60.00% 40.00% 20.00% 0.00% Ring Size (Km) 25
26 Scenario #4: Bursty High Priority Assume loaded ring Add bursty high priority traffic 26
27 Scenario #4 Setup High Priority Low Priority Over Loading the Ring 27
28 Scenario #4 Parameters Traffic Generation Parameters Site F (Low priority) Site D (High Priority) Start Time ON State Time OFF State Time Packet Size Traffic generated 800 Mbps 600 Mbps (OC12) 3 Gbps 2.4 Gbps (OC48) For Gandalf Decay Interval usec 28
29 Scenario 4: Traffic Generated Low priority traffic generated at upstream node High priority traffic generated at downstream node 29
30 Scenario #4 Gandalf Results OC-12 (High Priority Oscilations) % Utilization 80.00% 60.00% 40.00% 20.00% 0.00% Ring Size (Km) 30
31 Scenario #4 VoQ Results OC-12 (High Priority Oscilations % Utilization 80.00% 60.00% 40.00% 20.00% 0.00% Ring Size (Km) 31
32 Conclusions Special attention needs to be given to selection of the flow control mechanism because of: Dramatic effect on bandwidth utilization (can be as low as 55%!) Interaction of low priority traffic and high priority traffic 32
33 Conclusions... Found some simple traffic patterns that cause these problems Are there others? Need further investigation by WG Extent of the problems not clear 33
34 Backup Charts
35 Transit Buffer Analysis (SRP-fa) High priority Low priority High priority Low priority + High Threshold Low Threshold 35
36 Mechanisms used for Throttling Traffic Gandalf Reacts to congestion My-usage mechanism VOQ Continually monitors utilization and throttles accordingly Rate control messages (RCM) 36
37 Mechanisms used for Restoring Traffic Gandalf Ramp up algorithm Independent of traffic conditions VOQ Rate control messages (RCM) Restores BW based on traffic conditions 37
38 SRP-fa Ramp up Mechanism allow_usage = allow_usage + MAX_LINE_RATE - allow_usage LP_ALLOW allow_usage
39 VoQ Mechanism for throttling and ramping up AvailableRingBW = link capacity SUM ri RCF = AvailableRingBW / SUM wi Total allocated bandwidth = committed bandwidth + station weight *RCF (fi = ri + wi*rcf_min) 39
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