Added New TCP Handshake Expert and LiveFlow AVC field
A new Expert Event has been added to track the full length of a TCP Handshake from the first SYN sent from the client to the ACK that closes off the three-way handshake. This Expert Events provides a value that better represents the network latency from a user’s perspective.
LiveWire::
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Expert Event
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Notes
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1
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TCP Slow Connection Setup
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Description: The TCP handshake appears to be slow based on the configured threshold.
This expert measures from the first SYN packet that the client sends, rather
than the last SYN packet. This gives a more realistic value from the perspective of
the client attempting a connection.
Cause: There is network latency or the endpoints are slow to process the handshake.
Remedy: Check round-trip packet delay (latency). Check the CPU utilization of the
receiver. Check the responsiveness of the receiver by capturing at the receiving
end of the data.
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A new expert called TCP Slow Connection Setup has been added to LiveWire, as well as a new engine expert column called TCP Connection Setup (sec).
LiveFlow:
On the LiveFlow side: There is a new AVC field called artConnectionSetupTimeSum.