[squid-users] intermittent hangings to one or another of the 30 users on squid.

Hello,

I have 30 users who browse the internet all day through squid. My
version is squid-2.7.STABLE6 . I started squid with 5024 file
descriptors, cache is disabled and its a machine solely dedicated to
this with P4 CPU with PowerEdge 600SC and 1GB RAM.

The problem is that intermittently during the day one or another user
for a few minutes opens pagesand they just take forever to download.
The strange part is that when it happens to some users it doesnt
happen simulteanously to all the others. They are ubuntu users with
firefox.

Its extremely hard to diagnose this because its very hard to catch and
sometimes when the tech arrives all the pages start loading fine. Even
google would hang.

There is no packet loss to the proxy server, and load on the CPU is
low according to top.

What tool can I use to pinpoint exactly where the problem is?

cache_dir null /dev/null
auth_param basic program /usr/local/libexec/ncsa_auth /etc/squid/squid_passwd
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
acl localnet src 10.0.0.0/8 # RFC1918 possible internal network
acl localnet src 172.16.0.0/12 # RFC1918 possible internal network
acl localnet src 192.168.0.0/16 # RFC1918 possible internal network
acl SSL_ports port 443
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 CONNECT method CONNECT
acl ncsa_users proxy_auth REQUIRED
http_access allow manager localhost
http_access deny manager
http_access deny !Safe_ports
http_access deny CONNECT !SSL_ports
http_access allow localnet
http_access allow all
icp_access allow localnet
icp_access deny all
reply_body_max_size 512000 deny all
http_port 8080 transparent
hierarchy_stoplist cgi-bin ?
access_log /var/squid/logs/access.log squid
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
acl shoutcast rep_header X-HTTP09-First-Line ^ICY.[0-9]
upgrade_http0.9 deny shoutcast
via off
acl apache rep_header Server ^Apache
broken_vary_encoding allow apache
header_replace User-Agent Nutscrape/1.0 (CP/M; 8-bit)
max_filedescriptors 5024
forwarded_for off
coredump_dir /var/squid/cache

Thank you.

Regards,
Andres
Received on Fri Oct 16 2009 - 20:30:59 MDT