About performance.cache-refresh-timeout

Solution In Progress - Updated -

Issue

Docs say, "The number of seconds cached data for a file will be retained. After this timeout, data re-validation will be performed."
Is this on the server or the client?
Under what scenarios would I want to adjust this setting?
Would this increase small-file performance?
What is the trade-off for increasing this value?

Environment

glusterfs 3.1.*

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