slot size is specified in bytes using the max-size option. See
below for more info on the max-size option.
+ If possible, Squid using Rock Store creates a dedicated kid
+ process called "disker" to avoid blocking Squid worker(s) on disk
+ I/O. One disker kid is created for each rock cache_dir. Diskers
+ are created only when Squid, running in daemon mode, has support
+ for the IpcIo disk I/O module.
+
swap-timeout=msec: Squid will not start writing a miss to or
reading a hit from disk if it estimates that the swap operation
will take more than the specified number of milliseconds. By