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Merge PR #38587 into master

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* refs/pull/38587/head:
	doc: add explanatory note about cache trim rate setting

Reviewed-by: Patrick Donnelly <pdonnell@redhat.com>
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Patrick Donnelly 2021-01-06 13:34:38 -08:00
commit 7b39daab79
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doc/cephfs/cache-configuration.rst
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@ -77,6 +77,11 @@ life for the counter. If the MDS is continually removing items from its cache,
it will reach a steady state of ``-ln(0.5)/rate*threshold`` items removed per
second.
.. note:: Increasing the value of the confguration setting
``mds_cache_trim_decay_rate`` leads to the MDS spending less time
trimming the cache. To increase the cache trimming rate, set a lower
value.
The defaults are conservative and may need to be changed for production MDS with
large cache sizes.