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Browsing slow after adding squid proxy.

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Hi.
Been a long time since I last looked at a squid proxy. After add a
proxy to the network , browsing seems to have slowed considerably.  I
have build a squid proxy , this is configured into the network on via
our Sonicwall using the proxy feature. When I looked into the
configuration I did a few optimizations based on what I found on a
couple of websites.  All though I opted not to tweak the OS more than
increase the ulimit as I would not expect it to be required given the
hardware. It is running out of a SSD drive.

When I run top the box is idle for the most part. there are about 100
users on this site.

So my question is what may I have configured incorrectly or missed
that would help?


The hardware is  :

4 Gig Ram
Intel(R) Xeon(R) CPU           E3110  @ 3.00GHz (dual core)
hard disk  is SSD 32 GB

The / file system is ext3
The /var system is ext4 (cache is /var/spool/squid).

The OS is Linux Ubuntu 10 LTS

the squid configuration file looks like

acl all src all
acl manager proto cache_object
acl localhost src 127.0.0.1/32
acl to_localhost dst 127.0.0.0/8 0.0.0.0/32
acl localnet src 192.168.0.0/16 # TO BE correctly defined
acl SSL_ports port 443          # https
acl SSL_ports port 563          # snews
acl SSL_ports port 873          # rsync
acl Safe_ports port 80          # http
acl Safe_ports port 21          # ftp
acl Safe_ports port 443         # https
acl Safe_ports port 70          # gopher
acl Safe_ports port 210         # wais
acl Safe_ports port 1025-65535  # unregistered ports
acl Safe_ports port 280         # http-mgmt
acl Safe_ports port 488         # gss-http
acl Safe_ports port 591         # filemaker
acl Safe_ports port 777         # multiling http
acl Safe_ports port 631         # cups
acl Safe_ports port 873         # rsync
acl Safe_ports port 901         # SWAT
acl purge method PURGE
acl CONNECT method CONNECT
http_access allow manager localhost
http_access deny manager
http_access allow purge localhost
http_access deny purge
http_access deny !Safe_ports
http_access allow CONNECT
http_access deny CONNECT !SSL_ports
http_access allow localnet
http_access allow localhost
http_access deny all
icp_access allow localnet
icp_access deny all
http_port 3128
hierarchy_stoplist cgi-bin ?
cache_mem 2048 MB
maximum_object_size_in_memory 256 KB
cache_replacement_policy heap LFUDA
cache_dir aufs /var/spool/squid 10000 23 256
maximum_object_size 64 MB
cache_swap_low 90
cache_swap_high 95
access_log /var/log/squid/access.log squid
buffered_logs on
refresh_pattern ^ftp:           1440    20%     10080
refresh_pattern ^gopher:        1440    0%      1440
refresh_pattern -i (/cgi-bin/|\?) 0     0%      0
refresh_pattern (Release|Package(.gz)*)$        0       20%     2880
refresh_pattern .               0       20%     4320
quick_abort_min 0 KB
quick_abort_max 0 KB
acl shoutcast rep_header X-HTTP09-First-Line ^ICY.[0-9]
upgrade_http0.9 deny shoutcast
acl apache rep_header Server ^Apache
broken_vary_encoding allow apache
extension_methods REPORT MERGE MKACTIVITY CHECKOUT
half_closed_clients off
always_direct allow all
hosts_file /etc/hosts
memory_pools off
coredump_dir /var/spool/squid


Thanks
G


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