Post upgrade question 8.06 to 8.1.6 (EPC_DISABLED)

[jlakhani]

Hello,
friday i upgraded 8.0.6 to 8.1.6. thanks to you for the help l I became succesfull. The only issue i had was with the listener having this EPC_DISABLED=TRUE. the following is my current litsener configuration for 816. How can I enable EPC_DISABLED=TRUE for 8.1.6? When epc was enabled i received the following error message so i had to comment it out.
=======================================
TNS-12500: TNS:listener failed to start a dedicated server process
TNS-12533: TNS:illegal ADDRESS parameters
TNS-12560: TNSrotocol adapter error
TNS-00503: Illegal ADDRESS parameter
=====================================
LISTENER = (ADDRESS_LIST =
(ADDRESS =
(PROTOCOL = IPC)
(KEY = listener))

(ADDRESS =
(PROTOCOL = IPC)
(KEY = prod))

(ADDRESS =
(PROTOCOL = tcp)
(HOST = chihpdv2)
(PORT = 1521))
)
CONNECT_TIMEOUT_LISTENER = 90
SID_LIST_LISTENER = (SID_LIST =
(SID_DESC =
(SID_NAME = prod)
(ORACLE_HOME = /home/oracle/product/8.1.6)
# (ENVS='EPC_DISABLED=TRUE')
)
)

thanks
Jigar

[jlakhani]

I was able to find the note on metalink which states that epc_disabled isnt supported in 815 and above but does anybody know how i can improve net8 performance?