[squid-users] Squid without cache and high CPU usage

Hello,
I'm using Squid 2.9 stable7 as transparent proxy on Debian 6.0. I have 3 links to 3 ISPs. For now I have max 50mbits squid traffic for 200 users. Users are assigned to proper IP class and each class to proper link to ISP. Traffic is logged not cached on disk. I don't need anything else. Problem is with very high load and CPU usage (70%) of squid process. If I use simple NAT without Squid, CPU usage with this traffic is less than 5%. My machine is old P4 2,8HT 2gb ram, intel network cards.
My squid configuration:

http_port 192.168.0.100:8080 transparent

acl IP150 src 192.168.1.0/255.255.255.0
acl IP45 src 192.168.2.0/255.255.255.0
acl IP10 src 192.168.3.0/255.255.255.224

http_access allow IP150
http_access allow IP45
http_access allow IP10

tcp_outgoing_address x.x.x.150 IP150
udp_outgoing_address x.x.x.150 IP150
tcp_outgoing_address y.y.y.45 IP45
udp_outgoing_address y.y.y.45 IP45
tcp_outgoing_address z.z.z.10 IP10
udp_outgoing_address z.z.z.10 IP10

error_directory /usr/share/squid-langpack/pl
half_closed_clients off

acl safe_ports port 80
acl safe_ports port 443
http_access deny !safe_ports

acl all src 0.0.0.0/0
max_filedesc 8192

cache_mem 1000 MB
maximum_object_size 4096 kB

visible_hostname squid

dns_nameservers 127.0.0.1

cache_dir null /squid/squid-cache
memory_replacement_policy heap GDSF

cache_access_log /var/log/squid/access.log
cache_log /var/log/squid/cache.log
cache_store_log none
emulate_httpd_log on

log_icp_queries off

ipcache_size 10240
ipcache_low 90
ipcache_high 97

fqdncache_size 8192

memory_pools on
memory_pools_limit 100 MB

Could you please advise waht am I doing wrong how can I fix this?

Best regards,
mkeram
Received on Mon Apr 15 2013 - 19:44:43 MDT