[389-users] ldap dbmon output questions

Hello List,
I am running some  search performance tests , basic ldapsearch augument "cn" , on  local ldap host with rsearch, and
seeing  readwaiters:  values chainng , here is a sample from dbmon
currentconnections: 41
totalconnections: 6407
currentconnectionsatmaxthreads: 0
maxthreadsperconnhits: 0
dtablesize: 8192
readwaiters: 9
opsinitiated: 41305380
opscompleted: 41305371
entriessent: 48910644
bytessent: 3952907569
currenttime: 20160425192119Z
starttime: 20160425025259Z
nbackends: 2
backendmonitordn: cn=monitor,cn=userRoot,cn=ldbm database,cn=plugins,cn=config
backendmonitordn: cn=monitor,cn=NetscapeRoot,cn=ldbm database,cn=plugins,cn=co
 nfig


I read the documentation for dbmon output but still need to understand what can generate this  process to wait (  the search ldap is runn locally on host), I there anything can be tune in ldap cfg  to
have this redwaiters number close to null ?
 LDAP  version:

389-ds-base-1.3.4.4-000.x86_64
389-ds-console-1.2.12-000.noarch