transport performance metric mib

11 December, 2000

1

Transport Performance Metric MIB

draft-ietf-rmonmib-tpm-mib-01.txtRussell Dietz

[email protected] Working Group

49th IETF – San Diego, CA 2000

11 December, 2000

RMONMIB WG - 49th IETF San Diego, CA 2000

2

Application Performance…

Client Server

Work Request

Work Result

?

11 December, 2000


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Why transport metrics?

Client Server

Work Request

Work Result?

Sub Request

Sub Request

Sub Request

Sub Request

Sub Result

Sub Result

Sub Result

Sub Result

Trouble-Trouble-shootingshooting

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Web (HTTP) Example

Client Server

HTTP Connect

HTTP ACK

*form*.jdbc-sybase

*order-entry

*finish

*form*.jdbc-sybase

re-directed

finish-ack

entry-ack

form graphic

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NetMeeting (H.323) Example

Client Server

H.323 Connect

H.323 (Q.931)

Q.931 (Set)

H.245 (start)

H.245 (alive)

H.245 (alive)

rtsp (audio)

rtsp (video)

H.245 (video)

Q.931 (H.245)

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Categories of Metrics Jitter Exchange

Response Application

Response

Connection Connection

Sequence Connection

Window Routing

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Jitter Metrics Message Jitter…

starts with the abstraction of a communicated message… a sequence of adjacent data packets transferred in a given direction, concluded by the transfer of one or more adjacent data packets in the other direction.

measures the inter-packet gaps only for data packets within messages. It does not measure the gaps between the messages themselves.

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Message Jitter… example, an application that is downloading a

series of large graphics. The client first requests a graphic file download from the server. The server then sends the graphic to the client. The client then requests the next graphic, and so on. Within each download, the observed inter-packet gaps are of interest. The inter-packet gap from the last packet of one download and the first packet of the next is of less interest These later gaps are excluded.

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Message Jitter

Data Data Data Data

Data Data Data Data

Server -> Client Data Message

Data

Client -> Server Data Msg

* **

Client->Server Inter-pkt Gaps

Client -> Server Data Message

Metric Units Description

N Inter-Packet Gaps Count of the # of Inter-Packet Gaps measured for Data from the Client to the Server

(x) uSec Sum total of the Delta Times in these Inter-Packet Gaps

(X2) uSec2 Sum total of the Delta Times squared in these Inter-Packet Gaps

Xmax uSec The maximum Delta Time of Inter-Packet Gaps measured

Xmin uSec The minimum Delta Time of Inter-Packet Gaps measured.

(IX) Sum total of the data point # times the Delta Times in these Inter-Packet Gaps

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Jitter Metrics Stream Jitter…

does not include message considerations. Rather, measures the inter-packet gaps for all packets of the data stream for a given transfer direction.

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Stream Jitter… example is where an H.323 Voice-over-IP

(VoIP) data-stream is transferring an audio data-stream over RTP from one end-point to another. In this case, all inter-packets gaps observed would be of interest.

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Stream Jitter

Data Data Data Data

Data Data Data Data


Data

Client -> Server Data Msg

* **

Client->Server Inter-pkt Gaps



N Inter-Packet Gaps Count of the # of Inter-Packet Gaps measured for Data from the Client to the Server

(x) uSec Sum total of the Delta Times in these Inter-Packet Gaps

(X2) uSec2 Sum total of the Delta Times squared in these Inter-Packet Gaps

Xmax uSec The maximum Delta Time of Inter-Packet Gaps measured

Xmin uSec The minimum Delta Time of Inter-Packet Gaps measured.

(IX) Sum total of the data point # times the Delta Times in these Inter-Packet Gaps

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H.323 – Stream Jitter

Client Server

H.323 Connect

H.323 (Q.931)

Q.931 (Set)

H.245 (start)

H.245 (alive)

H.245 (alive)

rtsp (audio)

rtsp (video)

H.245 (video)

Q.931 (H.245)

Stream Jitter

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Response Metrics Exchange Responses…

starts with the abstraction of a communicated exchange-message. An exchange-message is considered to start with a series of adjacent data packets transferred in a given direction (exchange message request). The end of such a message is defined to be the transfer of one or more adjacent data packets in the other direction (exchange message response). Matters of sequencing or retransmission (duplicate) detection are excluded from consideration in the analysis of data packets when observing exchange-message related packets.

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Exchange Response Example

CS CS CS

SC SC SC

LastCS

Data

CS E-SERT

CS S-S ERT

CS CS CS

SC SC SC

ChangeDir

CS->SC

CS S-E ERT

StartCS

Data

SC S-S ERT

SC E-SERT

CS

LastSC

Data

ChangeDir

SC->CS

CS E-SERT

CS S-S ERT

SC S-E ERT

LastCS

Data

StartSC

Data

StartCS

Data

ChangeDir

SC->CS

LastSC

Data

CS S-E ERT

SC S-S ERT

SC E-SERT

ChangeDir

CS->SC

StartSC

Data

StartCS

Data

DefaultDir

(C->S)

Req. Network Delay+

Server Delay

Server Delay

Req. Network Delay+

Server Delay+

Resp. Network Delay

Client Delay(to nextrequest)

Exchange Message #1 Exchange Message #2

LEGENDCS = Client->Server Data PacketSC = Server->Client Data Packet

CS S-S ERT = Client->Server Start-to-Start Exchange Response TimeCS E-S ERT = Client->Server End-to-Start Exchange Response TimeCS S-E ERT = Client->Server Start-to-End Exchange Response TimeSC S-S ERT = Server->Client Start-to-Start Exchange Response TimeSC E-S ERT = Server->Client End-to-Start Exchange Response TimeSC S-E ERT = Server->Client Start-to-End Exchange Response Time

Req. Network Delay = SUM(CS S-S RT) - SUM(CS E-S RT);Resp. Network Delay = SUM(CS S-E RT) - SUM(CS S-S RT);

Server Overhead = SUM(CS E-S RT);

Client Overhead = SUM(SC E-S RT);

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Exchange ResponseStart to Start

Data Data Data Data

Data Data Data Data


Client->Server Start-Start

Exchange Response Time



N Client-> Svr Exchange Msg Requests

Count of # Client<->Server request/response pairs measured for exchange messages from the Client to the Server

mSec Sum total of the Start-to-Start Delta Times in these Exchange Response Times

(x2) mSec2 Sum squared total of the Start-to-Start Delta Times in these Exchange Response Times

Xmax mSec The maximum Start-to-Start Delta Time of these Exchange Response Times

Xmin mSec The minimum Start-to-Start Delta Time of these Exchange Response Times

(IX) Sum total of the data point # times the Start-to-Start Delta Time

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HTTP – Exchange Response

Client Server

HTTP Connect

HTTP ACK

*form*.jdbc-sybase

*order-entry

*finish

*form*.jdbc-sybase

re-directed

finish-ack

entry-ack

form graphic

Exchange Response

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Application Response Example

CS#1

S

SA

CS#2

CS#3

SC#1

SC#2

SC#3

LastCS

Data

CS E-SART

CS S-S ART

CS#6

CS#4

CS#5

SC#4

SC#5

SC#6

ChangeDir

CS->SC

CS S-E ART

StartCS

Data

SC S-S ART

SC E-SART

CS#7

LastSC

Data

ChangeDir

SC->CS

CS E-SART

CS S-S ART

SC S-E ART

LastCS

Data

StartSC

Data

StartCS

Data

ChangeDir

SC->CS

LastSC

Data

CS S-E ART

SC S-S RT

SC E-SRT

ChangeDir

CS->SC

StartSC

Data

Start & LastCS

Data

DefaultDir

(C->S)

Req. Network Delay+

Server Delay

Server Delay

Req. Network Delay+

Server Delay+

Resp. Network Delay

Client Delay(to next request)

CS#2

CS#3

ReTxIgnored

ReTxIgnored

LEGENDS = SYNSA = SYN-ACKCS = Client->Server Data PacketSC = Server->Client Data Packet

CS S-S ART = Client->Server Start-to-Start Application Response TimeCS E-S ART = Client->Server End-to-Start Application Response TimeCS S-E ART = Client->Server Start-to-End Application Response TimeSC S-S ART = Server->Client Start-to-Start Application Response TimeSC E-S ART = Server->Client End-to-Start Application Response TimeSC S-E ART = Server->Client Start-to-End Application Response Time

Req. Network Delay = SUM(CS S-S ART) - SUM(CS E-S ART);Resp. Network Delay = SUM(CS S-E ART) - SUM(CS S-S ART);

Server Overhead = SUM(CS E-S ART);

Client Overhead = SUM(SC E-S ART);

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Application ResponseStart to Start

Data Data Data Data

Data Data Data Data

Server -> Client Application Response

Client->Server Start-Start

Application Response Time

Client -> Server Application Request

Data Data

Server -> Client Retransmitted Datas

Data Data

Client->Server Retransmitted Datas


N Client->Svr Application Message Requests

Count of the # Client->Server request/response pairs measured for application message from the Client to the Server

mSec Sum total of the Start-to-Start Delta Times in these Application Response Times

(x2) mSec2 Sum squared total of the Start-to-Start Delta Times in these Application Response Times

Xmax mSec The maximum Start-to-Start Delta Time of these Application Response Times

Xmin mSec The minimum Start-to-Start Delta Time of these Application Response Times

(IX) Sum total of the data point # times the Start-to-Start Delta Time

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HTTP – Application Response

Client Server

HTTP Connect

HTTP ACK

*form*.jdbc-sybase

*order-entry

*finish

*form*.jdbc-sybase

re-directed

finish-ack

entry-ack

form graphic

Application Response

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More Metrics… Jitter Exchange

Response Application

Response

ConnectionConnection Connection Connection

SequenceSequence Connection Connection

WindowWindow RoutingRouting

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TPM MIB – Changes in 01 Basic edits for minor corrections

Removal of some ‘statistics’ for complete ‘reports’

Usage of xxxClientID in place of xxxClientServerAddress

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APM – Overall Framework

TPM StudyAPM Study

Micro-flow

Aggregation

Aggregation

Flow

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TPM MIB - Framework APM MIB used to determine application

flows/aggregations to report micro-flows in TPM report table.

TPM Controls used to create performance metric reports on flows/aggregations.

All reports are in the form of statistics Drill-down for performance anomalies

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TPM MIB Tables tpmReportControlTable - Study Control tpmMetricTable - Metric Selection

tpmReportTable - Detail Reports tpmCurrentTable - Current Aggregations tpmExceptionTable - Exception Reports

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APM/TPM Report Table Linkage

apmReportControl – N

tpmReportControl – N

apmReportControlIndex - N

apmReportEntry – N, r

tpmReportEntry – N, r, m, f..n

apmReportIndex - r

tpmReportEntry – N, r, m+1, f..n

apmReportEntry – N, r+1

tpmReportEntry – N, r+1, m, f..n

apmReportIndex - r+1

tpmReportEntry – N, r+1, m+1, f..n

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APM/TPM Current Table Links

apmReportControl – N

tpmReportControl – N

apmReportControlIndex - N

apmCurrentEntry – N, t

tpmCurrentEntry – N, t, m, f..n

apmTransactionID - t

tpmCurrentEntry – N, t, m+1, f..n

apmCurrentEntry – N, t..n

tpmCurrentEntry – N, t..n, m, f..n

apmTransationID – t..n

tpmCurrentEntry – N, t..n, m+1, f..n

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APM/TPM Exception Table Links

apmExceptionTable – E

tpmExceptionControl – E

apmExceptionIndex - E

apmTransactionResponsivenessNotification –

E

tpmExceptionReportEntry – E, t, m, f..n

apmTransactionID - t

tpmExceptionReportEntry – E, t, m+1, f..n

apmTransactionUnsuccessfulNotification –

E

tpmExceptionReportEntry – E, t+1, m. f..n

apmTransactionID – t+1

tpmExceptionReportEntry – E, t+1, m+1, f..n

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APM/TPM – Micro-flows tpmReportTable

tpmReportControlIndex protocolLocalDirIndex – Application

(micro) protocolLocalDirIndex – Network tpmReportServerAddress tpmReportClientID tpmReportMetricIndex – Metric and

Protocol tpmCurrentApmTransactionID

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APM/TPM Micro-flows

Protocol

Client Server Protocol Metric

WEBWEB JimJim AmazonAmazon WEBWEB ResponsResponsee

WEB Jim Amazon HTTP RT-Delay

WEB Jim DNS-1 DNS RT-Delay

WEB Jim D-Click HTTP RT-Delay

WEB Jim FTP-A FTP RT-Delay

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Updates in process Enhance ‘linkage’ with APM features

for additional ‘drill-down’ Integration of metrics from PMCAPS Integration of metric selection Document describing usage of

metrics for specific application groupings

11 December, 2000

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Transport Performance Metric MIB

draft-ietf-rmonmib-tpm-mib-01.txtRussell Dietz

[email protected] Working Group

49th IETF – San Diego, CA 2000

transport performance metric mib

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