[squid-users] Multi processors

I have compiled squid with those options below:

squid -v
Squid Cache: Version 2.5.STABLE12
configure options: --sysconfdir=/etc/squid
--enable-storeio=aufs,coss,diskd,ufs --enable-poll --enable-delay-pools
--enable-linux-netfilter --enable-htcp --enable-carp --with-pthreads
--enable-underscores --enable-external --enable-arp-acl
--with-maxfd=16384 --enable-async-io=50 --enable-snmp

It runs in a machine with 4 Itel Xeon processors, but squid no matter
how many instances i start, uses only one processor, and my other three
processors stay idle.

My Squid.conf is this: (I have cutted-out my acls and http_acces)

http_port 8080
hierarchy_stoplist cgi-bin ?
acl QUERY urlpath_regex cgi-bin aspx \?
no_cache deny QUERY

# OPTIONS WHICH AFFECT THE CACHE SIZE
cache_mem 3072000 KB
maximum_object_size 20000 KB
minimum_object_size 0 KB
maximum_object_size_in_memory 4 MB
cache_replacement_policy lru
memory_replacement_policy lru

# LOGFILE PATHNAMES AND CACHE DIRECTORIES
cache_dir ufs /var/spool/squid 5000 16 256
cache_access_log /var/log/squid/access.log
cache_log none
cache_store_log none
pid_filename /var/run/squid.pid

# OPTIONS FOR EXTERNAL SUPPORT PROGRAMS
ftp_list_width 32
ftp_passive on

auth_param basic children 5
auth_param basic realm Squid proxy-caching web server
auth_param basic credentialsttl 2 hours
auth_param basic casesensitive off

# OPTIONS FOR TUNING THE CACHE
refresh_pattern ^ftp: 1440 20% 10080
refresh_pattern ^gopher: 1440 0% 1440
refresh_pattern . 0 20% 4320
quick_abort_pct 98

# MISCELLANEOUS
append_domain .rio.rj.gov.br
memory_pools_limit 50 MB
log_icp_queries off
snmp_port 3401

Does anyone have an idea?
I have looked up in this list old mails, and have not found anything.

Thanks a lot,

-- 
Marcos Camões Bourgeaiseau - KIKO
================================================
e-mail pessoal: mcbourgeaiseau@gmail.com
e-mail institucional: marcoscamoes@rio.rj.gov.br