BPF Performance Tools: Linux System and Application Observability (WesLee Frisby's Library) by Brendan Gregg

Author:Brendan Gregg
Language: eng
Format: epub
Publisher: Addison-Wesley Professional
Published: 2020-06-15T00:00:00+00:00

Ping latency: The time from an ICMP echo request to a response. This measures the network and kernel stack handling of the packet on each host.

TCP connection latency: The time from when a SYN is sent to when the SYN,ACK is received. Since no applications are involved, this measures the network and kernel stack latency on each host, similar to ping latency, with some additional kernel processing for the TCP session. TCP Fast Open (TFO) is a technology to eliminate connection latency for subsequent connections by providing cryptographic cookie with the SYN to authenticate the client immediately, allowing the server to respond with data without waiting for the three-way handshake to complete.

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