moonchen commented on code in PR #13667:
URL: https://github.com/apache/trafficserver/pull/13667#discussion_r3993415163
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doc/admin-guide/files/records.yaml.en.rst:
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@@ -2433,6 +2433,29 @@ Security
post body larger than this limit the response will be terminated with
413 - Request Entity Too Large and logged accordingly.
+.. ts:cv:: CONFIG proxy.config.http.log_server_tcp_info INT 0
+ :reloadable:
+
+ Enables sampling of ``TCP_INFO`` on the origin connection, so that the round
+ trip time to the origin can be logged.
Review Comment:
Normally once per transaction: one `getsockopt(TCP_INFO)` call when the
origin response header is successfully parsed, provided the config and logging
guards allow it. Each additional successfully parsed response header (for
example, during a retry or redirect) can cause another read; a direct cache hit
does not.
The header-time snapshot keeps RTT close to origin TTFB. The kernel
maintains these statistics independently, including across reused connections.
I've made the frequency explicit in the docs. Collection is independent of the
later `proxy.config.log.sampling_frequency` decision.
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