[squid-users] HTTP performance hit with Squid

SaRaVanAn saravanan.nagarajan87 at gmail.com
Thu Oct 22 18:47:39 UTC 2015

Hi ,
we have been using squid 3.1.20 comes with debian wheezy 7. We could see
there is a peformance hit in http traffic when we use Squid.

For each HTTP GET request coming from client to proxy server, Squid takes
nearly 2 seconds to generate HTTP GET in order to establish a connection
with server.

There is always a ~2 second delay between the request coming to our system
and going out of Squid. Suppose if a page has lot of embedded URL's it's
taking more time with squid in place.Suppose If I disable squid the page
loads very fast in client browser.

What could be the reason? Do I need to tweak any configuration for this?
The first page request always loads slow with Squid.

*Configuration*http_port 3128
http_port 3129 tproxy
http_port 80 accel defaultsite=example.com
acl manager proto cache_object
acl localhost src ::1
acl to_localhost dst ::1
acl QUERY urlpath_regex cgi-bin \?
cache deny QUERY
acl denied_status_404 http_status 404
deny_info  http://example.com/ denied_status_404
http_reply_access deny denied_status_404
acl denied_status_503 http_status 503
deny_info http://example.com denied_status_503
http_reply_access deny denied_status_503
acl SSL_ports port 443
acl Safe_ports port 80
acl Safe_ports port 21
acl Safe_ports port 443
acl Safe_ports port 70
acl Safe_ports port 210
acl Safe_ports port 1025-65535
acl Safe_ports port 280
acl Safe_ports port 488
acl Safe_ports port 591
acl Safe_ports port 777
acl PURGE method PURGE
http_access allow PURGE localhost
http_access deny PURGE
http_access allow manager localhost
http_access deny manager
http_access deny !Safe_ports
http_access deny CONNECT all
http_access allow all
icp_access allow all
tcp_outgoing_address x.y.z.5
acl VIDEO  url_regex ^http://example\.examplevideo\.com
cache allow VIDEO
cache_mem 100 mb
maximum_object_size_in_memory 10 kb
memory_replacement_policy heap LFUDA
cache_replacement_policy heap LFUDA
cache_dir aufs //var/logs/cache 6144 16 256
store_dir_select_algorithm round-robin
maximum_object_size  51200 kb
cache_swap_low 70
cache_swap_high 80
access_log //var/logs/access.log squid
cache_store_log none
logfile_rotate 1
mime_table //var/opt/abs/config/acpu/mime.conf
pid_filename /var/run/squid3.pid
 strip_query_terms off
cache_log //var/logs/cache.log
coredump_dir //var/cache
acl apache rep_header server ^apache
refresh_pattern -i ^http://.wsj./.* 10 200% 10 override-expire
override-lastmod reload-into-ims ignore-reload
refresh_pattern -i \.(gif|png|jpg|jpeg|ico)$ 480 100% 480 override-expire
override-lastmod reload-into-ims
refresh_pattern -i \.(htm|html|js|css)$ 480 100% 480 override-expire
override-lastmod reload-into-ims
refresh_pattern ^ftp:       1440    20% 10080
refresh_pattern ^gopher:    1440    0%  1440
refresh_pattern -i (/cgi-bin/|\?) 0 0%  0
refresh_pattern .       0   20% 4320
quick_abort_min 0 kb
quick_abort_max 0 kb
negative_ttl 1 minutes
positive_dns_ttl 1800 seconds
store_objects_per_bucket 100
forward_timeout 2 minutes
shutdown_lifetime 2 seconds
visible_hostname x.y.z.3
server_persistent_connections off
dns_nameservers x.y.z.1 x.y.z.2
ipcache_size 8192
fqdncache_size 8192
memory_pools off


Saravanan N
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