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Network delay Graph and Network latency

Response time is getting beyond SLA.We want to know how much network time is part of response time. Would Network delay graph ( ICMP ) of Loadrunner can give Network latecy ? what is difference between netork time in Netowrk delay graph and Time to first buffer breakdown graph? Which network time i can take as network latency ? 

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Here is some info I had gathered some time back.


Network delay graph:

Shows the delays for the complete path between the source and destination machines (for example, the database server and Vuser load generator).


To measure network performance, the Network monitor sends packets of data across the network.
When a packet returns, the monitor calculates the time it takes for the packet to go to the requested
node and return. This time is the delay which appears in the Network Delay Time graph.


The Network Sub-Path Time graph displays the delay from the source machine to each node along
the path. The Network Segment Delay graph displays the delay for each segment of the path. The
Network Delay Time graph displays the delay for the complete path between the source and
destination machines.


Time to first Buffer:

Displays the amount of time that passes from the initial HTTP request (usually
GET) until the first buffer is successfully received back from the Web server.
The first buffer measurement is a good indicator of Web server delay as well as
network latency.

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Can anyone please let me know, how to configure network latency graph using controller on Windows machine.



Naresh Nakka

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