weblogic 10.3.6 and threadpool
Weblogic 10.3.6 running jdk 1.7 64 bit on Solaris 10 sparc have following as initial configuration Dweblogic.threadpool.MinPoolSize=30.
It is configured to use Enable Native IO and I could see performance packed installed like server/native/solaris/sparc64 and server/native/solaris/sparc64/oci920_8.
I have run thread dumps and could see a number of BLOCKED threads on weblogic thread like below
"ExecuteThread: '3' for queue: 'weblogic.socket.Muxer'" daemon prio=3 tid=0x0000
000104047800 nid=0x45 waiting for monitor entry [0xffffffff5beff000]
  java.lang.Thread.State: BLOCKED (on object monitor)
       at weblogic.socket.DevPollSocketMuxer.processSockets(DevPollSocketMuxer.java:92)
or
"[ACTIVE] ExecuteThread: '32' for queue: 'weblogic.kernel.Default (self-tuning)'