Www.ist-muse.eu Performance Evaluation of the CPE WAN Management Protocol Serafeim Papastefanos...

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Performance Evaluation of the CPE WAN Management Protocol

Serafeim PapastefanosNTUA

www.ist-muse.euICCS / NTUA

Outline

> Introduction to CWMP

> Advantages / disadvantages of CWMP

> Performance metrics

> Improvements

> Results

> Implementation details

> Conclusions


The CPE WAN Management Protocol (TR-69)

Gaming Console

Security

VoIP Phone

OperationsDevice Management

Firmware ManagementService Management

AutoProvisioningBAR

RMA Services

Media Server

ResidentialGateway

TV & Set-Top box

Hi-Fi Audio

PC

Home NetworkPublic Network

ACS SouthboundInterface

ACS NorthboundInterface

Service ProvidersOperators

Content ProvidersApplication Providers

Customer Support Representatives

CPE WANManagement Protocol

CPE Parameters

CPE Parameters

SSL/TLS

HTTP

SOAP

RPC Methods

Inte

rnet

Sta

ndar

dsD

SL

For

umD

efin

ed

Ven

dor

Def

ine

d

TCP/IP


Advantages of CWMP

> Usage of TCP• Reliability• No problem transferring bulk data

> Passing through firewalls as HTTP traffic

> Avoidance of persistent connections

> Usage of XML• Extensibility• Lots of tools


Disadvantages of CWMP

> Usage of XML• Increased requirements in bandwidth• Increased requirements in resources

– Especially in TR069 clients which are embedded devices

> Single ACS• This may be an issue in a multi-provider environment


Performance Metrics

> Processing time• Decoding and encoding of messages• Management process• Network delay

> Memory requirements

> Bandwidth requirements

> GetParameterValues and GetParameterValuesResponse messages will be used for measurements


Improvements

> Generic parsers• DOM

– Can also be used for encoding or messages

• SAX– Encoding has to be done “by hand”

• Easy to use – more resource requirements

> Non-generic parsers• Harder to use – less resource requirements

> Compression• We reduce the bandwidth requirements but increase the

processing time.


Memory requirements

0

20

40

60

80

100

120

140

160

180

200

0 50 100 150 200# of state variables

siz

e /

KB

yte

s

GetParameterValues

GetParameterValuesDom

GetParameterValuesResponse

GetParameterValuesResponseDom


Encoding / decoding time

0

10

20

30

40

50

60

70

80

0 50 100 150 200# of state variables

tim

e / m

s

DOM timegeneric timeCompression time


Compression sizes

0

5

10

15

20

25

30

35

40

45

50

0 20 40 60 80 100 120 140 160 180 200Number of state variables

SO

AP

PD

U s

ize

(Kb

ytes

)

GetParameterValues

GetParameterValues Bulk

GetParameterValues (Compressed)

GetParameterValues Bulk(Compressed)


Time needed for management

0

0,1

0,2

0,3

0,4

0,5

0,6

0 50 100 150 200

# of state variables

tim

e / s

512/256 kbit1024/512 kbit10 Mbit512/256 kbit comp1024/512 kbit comp10 Mbit comp


Implementation details

> A mini-ITX with a 600 MHz CPU was used.

> CWMP client build in C• Intel’s IXML library used for DOM parsing• Our implementation of non-generic parser

> mallinfo() to measure the DOM tree memory requirements

> minilzo library to implement compression

> gettimeofday() used to measure time


Conclusions

> TR069 has many advantages over NETCONF and SNMP

> TR069 benefits from compression of messages, even in high network links

> Using SAX or even better non-generic parsers instead of DOM optimizes resource usage and speed

Www.ist-muse.eu Performance Evaluation of the CPE WAN Management Protocol Serafeim Papastefanos...

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