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OfficeServ 7400

Enterprise IP Solutions. OfficeServ 7400. Quick Install Guide - Data Server – GWIM QoS. Mar, 2006 OfficeServ Lab. Samsung Electronics Co., Ltd. GWIM SPQ(Strict Priority Queuing)

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OfficeServ 7400

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  1. Enterprise IP Solutions OfficeServ 7400 Quick Install Guide- Data Server –GWIM QoS Mar, 2006 OfficeServ Lab. Samsung Electronics Co., Ltd.

  2. GWIM SPQ(Strict Priority Queuing) Highest class served first. Only if the waiting list in the highest class is empty, other classes can be served. HTBQ(Hierarchical Token Bucket Queuing) Supports the classification/shaping/queuing functions Less complexity than CBQ. guarantee of configured bandwidth(Rate) and the on-demand distribution of excess bandwidth(BW Sharing) OS7400 QoS Function Overview

  3. Linux kernel TC provides various Queuing Disciplines(Qdisc) SPQ, HTBQ, CBQ,… Root Qdisc is attached to device(interface). Arbitrary class tree can be created and attached to the Root Qdisc. Recursively, leaf classes can own another Qdisc as its own queuing policy. If Packet is to transmit through one interface, it is classified as one of leaf classes according to configured filter rules and put into Qdisc attached to the leaf class. Iteratively, the packet is classified … GWIM QoS Internal (I)

  4. GWIM QoS Internal (II) • HTBQ(Hierarchical Token Bucket Queuing) • - 3 types of class : root, inner, leaf • Only leaf classes actually shape packets; packets are only delayed in these leaf classes. The inner classes (all the way up to the root class) exist to define how borrowing/lending occurs. • - 2 token buckets per class : 1 for AR(Assured Rate), 1 for CR(Ceil Rate) • rate limiting(shaping) in only leaf classes. • - BW borrowing up to CR from parent class by borrowing ctokens(parent’s tokens). • If excess BW of the parent class is not available, the parent class attempt to borrow BW from parent of it. This can continue to reach Root class. • - excess BW of inner class is distributed in the proportion of Quantum of demanding classes with highest priority. • Quantum = Rate / R2Q ; calculated automatically

  5. GWIM QoS Internal (III) • SPQ(Strict Priority Queuing) • - PRIO qdisc used • - doesn’t actually shape, only subdivides traffic based on how filters are configured. • - 3 types of class : high, middle, low => bands • - priomap • without tc filters, decide how to enqueue traffic according to TC_PRIO priority. • => GWIM supports only TC filters, so just ignore. • - By default, each class contains pure FIFO qdisc. However, it can be replaced with any qdisc. • => GWIM does not support this feature.

  6. Eth0 used as WAN interface QoS support is needed for VoIP traffic transmitted via eth0. Total throughput 200Mbps = 25Mbyte/s VoIP (class VOIP) RTP, RTCP G.729 call with voice payload size of 20 bytes (20 ms) (14 bytes of Ethernet header + 40 bytes of IP(20)/UDP(8)/RTP(12) headers + 20 bytes voice payload + 4 bytes of Ethernet CRC)* 8 bits per byte * 50 pps = 31.2 Kbps 31.2 * 256 (Assuming number of simultaneous calls) AR = 8000 kbps (1000kbyte/s), CR = 2Mbyte/s, Priority = 1 (highest) Signal SIP, H.323, SPNet(Samsung Proprietary Networking) Assuming 160 kbps = 20 KB/s (AR), CR = 40kbyte/s, Priority = 1 (highest) AR = 8 Mbps (1Mbyte/s), CR = 3Mbyte/s Data Traffic (class Data) AR = Total throuput – VoIP Traffic = 24 Mbyte/s, CR = 25Mbyte/s TCP (class data_tcp) AR = 10Mbyte/s, CR = 25Mbyte/s , prio = 2 Etc (default class) AR = 14Mbyte/s, CR = 25Mbyte/s prio = 3 Sample Scenario

  7. HTBQ Class Diagram class Device Interface Qdisc Rate: 25 MB/s Root Rate: 3MB/s Ceil: 25MB/s Rate: 1MB/s Ceil: 25MB/s VOIP Data Signal Voice default tcp Rate: 20KB/s Ceil: 25MB/s Pri: 1 Rate: 1000KB/s Ceil: 25MB/s Pri: 1 Rate: 2MB/s Ceil: 25MB/s Pri: 2 Rate: 1MB/s Ceil: 25MB/s Pri: 3 pFIFO pFIFO pFIFO pFIFO

  8. Common Configuration : IP and Port Groups

  9. Common Configuration : VoIP Filter Groups

  10. Common Configuration : Data Filter Group If a packet matches more than one filters, a filter of higher priority(lower value) will be selected. Note

  11. HTBQ Configuration – Root and Inner Classes bps, Kbps, and Mbps, which are the unit of the Rate and Ceil options, mean 8 bits/s, 8 Kbits/s, and 8 Mbits/s respectively. Note

  12. HTBQ Configuration – VoIP Classes(I)

  13. HTBQ Configuration – VoIP Classes(II)

  14. HTBQ Configuration – Data Class

  15. HTBQ Configuration – Default Class

  16. HTBQ Configuration – Class Group List 1. Set the rate of the parent class rate not to be less than a total of that of all child classes. 2. Set the ceil of the parent class not to be less than the maximum value of that of all child classes. Note

  17. Applying HTBQ Policy

  18. Running HTBQ

  19. SPQ Configuration : VOIP class

  20. SPQ Configuration : Data class

  21. SPQ Configuration – Root Class

  22. SPQ Configuration – Class Group List

  23. Applying SPQ Policy

  24. Running SPQ

  25. MGI64 MP40 P1 P1 P2 P2 P3 P3 P4 P4 P5 P5 P6 P6 P13 P13 LNK LNK ACT ACT LNK LNK ACT ACT RST RST P7 P7 P8 P8 P9 P9 P10 P10 P11 P11 P12 P12 P14 P14 GLIMP GLIMP P1 P2 P3 P4 P5 LNK ACT SIO P6 P7 P8 P9 P10 V35 P1 P2 RUN V35 HSSI P1 P2 P3 RST SIO P3 HSSI GWIM VoIP Service Interoperation * Classification between VOIP and Data is done by GSIM (FFP hardware based) efficiently. => ToS byte of VoIP traffic (signal and media) is marked 0xa0.(DSCP = 40) => ToS byte of Data traffic (non-VoIP) is marked 0x0.(DSCP = 0) * Using this, GWIM needs only one ToS filter to classify VoIP traffic. INTERNET GWIM Data (ToS 0x0] VOIP (ToS 0xa0] GSIM GPLIM GPLIM MGI64

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