Docs: Mention creation of diskers in cache_dir rock

diff --git a/src/cf.data.pre b/src/cf.data.pre
index cb591c4adf823a0f7ed03f6505f9f6ffe1971689..8c813788813df77c7dfcc5ab24b324e8ed32a4e5 100644 (file)
--- a/src/cf.data.pre
+++ b/src/cf.data.pre
@@ -2906,6 +2906,12 @@ DOC_START
        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