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production-notes: tweak Linux NUMA disable #2366

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23 changes: 15 additions & 8 deletions source/administration/production-notes.txt
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Expand Up @@ -284,21 +284,28 @@ Please consult your system documentation for details.
Configuring NUMA on Linux
`````````````````````````

When running MongoDB on Linux, you may instead use the ``numactl``
command and start the MongoDB programs (:program:`mongod`, including
the :doc:`config servers </core/sharded-cluster-config-servers>`;
:program:`mongos`; or clients) in the following manner:
When running MongoDB on Linux, you should disable *zone reclaim* in the
``sysctl`` settings using one of the following commands:

.. code-block:: sh

numactl --interleave=all <path>
echo 0 | sudo tee /proc/sys/vm/zone_reclaim_mode

where ``<path>`` is the path to the program you are starting. Then,
disable *zone reclaim* in the ``proc`` settings using the following command:
.. code-block:: sh

sudo sysctl -w vm.zone_reclaim_mode=0

Then, you should use the ``numactl`` command to start the MongoDB programs
(:program:`mongod`, including the :doc:`config servers
</core/sharded-cluster-config-servers>`; :program:`mongos`; and clients) in
the following manner:

.. code-block:: sh

echo 0 > /proc/sys/vm/zone_reclaim_mode
numactl --interleave=all <path> <options>

where ``<path>`` is the path to the program you are starting, and ``<options>``
are any optional arguments to pass to the program.

To fully disable NUMA behavior, you must perform both operations. For more
information, see the `Documentation for /proc/sys/vm/*
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