Hi all, We've been running Unbound in production for some months now. Currently, I have 1.3.1 runing, getting ready to update to 1.3.3. We have three server in prod, each with one unbound running (2 thread each) in a zone. When we removed one server, we've started to have some problems. When I decided to stop one more server, leaving only one running, we had major dns problems. We have a lot of systems, we're doing web serving... Here is how I compile unbound on Solaris 10 x86 5/09 with Sun Studio 12u1... export CC=cc ./configure \ --prefix=/opt/unbound \ --libexecdir=/opt/unbound/lib \ --sysconfdir=/var/unbound/etc \ --sharedstatedir=/var/unbound \ --localstatedir=/var/unbound \ --with-conf-file=/var/unbound/etc/unbound.conf \ --with-run-dir=/var/unbound \ --with-chroot-dir=/var/unbound \ --with-pidfile=/var/unbound/run/unbound.pid \ --with-username=nobody \ --without-pthreads \ --without-solaris-threads \ --with-ldns=../ldns-1.6.1 As per the unbound optimize page says. So basically, I'm using the Forked operation... The systems I have are Sun X4100 with a dual opteron : # psrinfo -pv The physical processor has 1 virtual processor (0) x86 (AuthenticAMD family 15 model 37 step 1 clock 2792 MHz) AMD Opteron(tm) Processor 254 The physical processor has 1 virtual processor (1) x86 (AuthenticAMD family 15 model 37 step 1 clock 2792 MHz) AMD Opteron(tm) Processor 254 and # prtconf System Configuration: Sun Microsystems i86pc Memory size: 8064 Megabytes So the question. What would be the optimal setup/configuration ? This is currently what I'm using. do-ip6: no hide-identity: yes hide-version: yes infra-cache-slabs: 2 interface: 0.0.0.0 key-cache-slabs: 2 msg-cache-size: 256m msg-cache-slabs: 2 num-queries-per-thread: 950 num-threads: 2 outgoing-range: 950 rrset-cache-size: 512m statistics-interval: 3600 verbosity: 1 access-control: 0.0.0.0/0 refuse access-control: 10.0.0.0/8 allow access-control: 127.0.0.0/8 allow access-control: 172.16.0.0/14 allow access-control: 192.168.0.0/16 allow Base on what I understand, each of my Unbound server can serve 2x950 request each at the same time, right ? Each of my dns servers are only running Unbound and nsd, ther are strip down. How can I increase drastically the number of request one server can process ? The systems are mostly idle... and almost 4 Gb of ram is never being used. Thank's. -- Simon-Bernard Drolet, SPecialiste X Inc., 514.247.6741. SBDrolet<at>gmail(dot)com, Sun Solaris Contractor Certified Sun Technical Instructor, Sun Certified System Admin (2.5,7,8,9,10), Network Admin (2.5,7,8,9,10) and Security Admin for Solaris 9 and 10.