Probably outdated docs
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"In addition, all active keys and information about data are stored in a shared memory zone, whose name and size are configured by the keys_zone parameter. One megabyte zone can store about 8 thousand keys."
In practice, my 1MB cache stopped growing on 4k entries (still far from max_size) so I suspect that the documentation may be oudated and the "about 8 thousand keys" should be changed to "about 4 thousand keys"