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	The default limit on size of objects stored to disk.
	This size is used for cache_dir where max-size is not set.
	The value is specified in bytes, and the default is 4 MB.

	If you wish to get a high BYTES hit ratio, you should probably
	increase this (one 32 MB object hit counts for 3200 10KB
	hits).

	If you wish to increase hit ratio more than you want to
	save bandwidth you should leave this low.

	NOTE: if using the LFUDA replacement policy you should increase
	this value to maximize the byte hit rate improvement of LFUDA!
	See replacement_policy below for a discussion of this policy.