Added searchstack keyword description. (Sorry, I don't like the word "slab"...)

diff --git a/doc/man/man5/slapd-bdb.5 b/doc/man/man5/slapd-bdb.5
index c76dbdb4bce97854da90dfbeca7104d9bf55bef7..b387fd3de96db754447c80e38a79582df8e41240 100644 (file)
--- a/doc/man/man5/slapd-bdb.5
+++ b/doc/man/man5/slapd-bdb.5
@@ -94,6 +94,19 @@ The default is the same as
 Specify the file protection mode that newly created database 
 index files should have.
 The default is 0600.
+.TP
+.B searchstack <depth>
+Specify the depth of the stack used for search filter evaluation.
+Search filters are evaluated on a stack to accomodate nested AND / OR
+clauses. An individual stack is assigned to each server thread.
+The depth of the stack determines how complex a filter can be
+evaluated without requiring any additional memory allocation. Filters that
+are nested deeper than the search stack depth will cause a separate
+stack to be allocated for that particular search operation. These
+allocations can have a major negative impact on server performance,
+but specifying too much stack will also consume a great deal of memory.
+Each search stack uses 512K bytes per level. The default stack depth
+is 16, thus 8MB per thread is used.
 .SH FILES
 .TP
 ETCDIR/slapd.conf