Adding upstream version 5.6.0.upstream/5.6.0upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 36 insertions, 0 deletions

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+.. SPDX-License-Identifier: GPL-3.0-or-later
+
+.. _performance:
+
+**************************
+Performance and resiliency
+**************************
+
+For DNS resolvers, the most important parameter from performance perspective
+is cache hit rate, i.e. percentage of queries answered from resolver's cache.
+Generally the higher cache hit rate the better.
+
+Performance tunning should start with cache :ref:`cache_sizing`
+and :ref:`cache_persistence`.
+
+It is also recommended to run :ref:`systemd-multiple-instances` (even on a
+single machine!) because it allows to utilize multiple CPU threads and
+increases overall resiliency.
+
+Other features described in this section can be used for fine-tunning
+performance and resiliency of the resolver but generally have much smaller
+impact than cache settings and number of instances.
+
+.. toctree::
+   :maxdepth: 1
+
+   daemon-bindings-cache
+   systemd-multiinst
+   modules-predict
+   modules-prefill
+   modules-serve_stale
+   modules-rfc7706
+   modules-priming
+   modules-edns_keepalive
+   daemon-bindings-net_xdpsrv
+