From: Aram Sargsyan Date: Thu, 29 Jan 2026 13:30:31 +0000 (+0000) Subject: Document response time RTT counetrs X-Git-Tag: v9.21.20~24^2 X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=38841ba78b21b40f4929bc750d7af2fcd4712a9b;p=thirdparty%2Fbind9.git Document response time RTT counetrs --- diff --git a/doc/arm/reference.rst b/doc/arm/reference.rst index 6e14b129590..341f1b3483e 100644 --- a/doc/arm/reference.rst +++ b/doc/arm/reference.rst @@ -8468,9 +8468,6 @@ Resolver Statistics Counters ``ValFail`` This indicates the number of failed DNSSEC validations. -``QryRTTnn`` - This provides a frequency table on query round-trip times (RTTs). Each ``nn`` specifies the corresponding frequency. In the sequence of ``nn_1``, ``nn_2``, ..., ``nn_m``, the value of ``nn_i`` is the number of queries whose RTTs are between ``nn_(i-1)`` (inclusive) and ``nn_i`` (exclusive) milliseconds. For the sake of convenience, we define ``nn_0`` to be 0. The last entry should be represented as ``nn_m+``, which means the number of queries whose RTTs are equal to or greater than ``nn_m`` milliseconds. - ``NumFetch`` This indicates the number of active fetches. @@ -8516,6 +8513,21 @@ Resolver Statistics Counters ``Priming`` This indicates the number of priming fetches performed by the resolver. +.. _resolver_rtt_stats: + +Resolver Queries Response Time counters +^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ + +:iscman:`named` provides query response round-trip time (RTT) counters +(histogram) both for incoming and outgoing queries in milliseconds. Response +times which are lower than 1ms are calculated under the ``~0`` counter. +Response times from 1ms to 15ms are calculated under their own counters, e.g. a +response that took 5ms to complete is calculated under the ``5`` counter. +Response times starting from 16ms are calculated under the ``MinMS-MaxMS`` +(inclusive) range counters. For example, a response that took 18ms to complete +is calculated under the ``18-19`` counter, and a response that took 550ms to +complete is calculated under the ``512-575`` counter. + .. _socket_stats: Socket I/O Statistics Counters