[squid-users] Squid 3.1.10 Congestion Warnings

I'm receiving the below congestion warning several times a day. I'm
wondering if this is anything to be concerned about.

2011/02/07 10:06:07| squidaio_queue_request: WARNING - Queue congestion

My squid.con file is below:

#
# Recommended minimum configuration:
#
acl manager proto cache_object
acl localhost src 127.0.0.1/32 ::1
acl to_localhost dst 127.0.0.0/8 0.0.0.0/32 ::1

# Example rule allowing access from your local networks.
# Adapt to list your (internal) IP networks from where browsing
# should be allowed
acl localnet src 10.10.0.0/16 # RFC1918 possible internal network
acl localnet src fc00::/7 # RFC 4193 local private network range
acl localnet src fe80::/10 # RFC 4291 link-local (directly plugged)
machines

acl SSL_ports port 443
acl SSL_ports port 7001
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 snmppublic snmp_community cadc
acl snmpsrv src 10.10.2.202
snmp_access allow snmppublic snmpsrv
snmp_incoming_address 10.10.2.226
snmp_port 3401

acl malware_block_list url_regex -i
"/usr/local/squid/malware_block_list.txt"
http_access deny malware_block_list
deny_info http://intranet.cadc.circdc.dcn/malwarealert/malware.htm
malware_block_list

#
# Recommended minimum Access Permission configuration:
#
# Only allow cachemgr access from localhost
http_access allow manager snmpsrv
http_access deny manager

# Deny requests to certain unsafe ports
http_access deny !Safe_ports

# Deny CONNECT to other than secure SSL ports
http_access deny CONNECT !SSL_ports

# We strongly recommend the following be uncommented to protect innocent
# web applications running on the proxy server who think the only
# one who can access services on "localhost" is a local user
#http_access deny to_localhost

#
# INSERT YOUR OWN RULE(S) HERE TO ALLOW ACCESS FROM YOUR CLIENTS
#

# Example rule allowing access from your local networks.
# Adapt localnet in the ACL section to list your (internal) IP networks
# from where browsing should be allowed
http_access allow localnet
http_access allow localhost

# And finally deny all other access to this proxy
http_access deny all

# Squid normally listens to port 3128
http_port 10.10.2.226:3128

# We recommend you to use at least the following line.
hierarchy_stoplist cgi-bin ?

# Uncomment and adjust the following to add a disk cache directory.
cache_replacement_policy heap GDSF
cache_dir aufs /cache1/cache 16384 16 256
cache_dir aufs /cache2/cache 16384 16 256

# Leave coredumps in the first cache dir
coredump_dir /usr/local/squid/var/cache

# Add any of your own refresh_pattern entries above these.
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

icap_enable on
icap_send_client_ip on
icap_send_client_username on
icap_client_username_encode off
icap_client_username_header X-Authenticated-User
icap_preview_enable on
icap_preview_size 1024
icap_service service_req reqmod_precache bypass=1
icap://127.0.0.1:1344/squidclamav
adaptation_access service_req allow all
icap_service service_resp respmod_precahe bypass=1
icap://127.0.0.1:1344/squidclamav
adaptation_access service_resp allow all

cache_access_log none
cache_mgr mgrasso_at_cadc.uscourts.gov
ftp_user squid_at_cadc.uscourts.gov
cache_mem 512 MB
dns_nameservers 10.10.2.214 10.10.2.215
refresh_all_ims on
memory_replacement_policy heap GDSF
maximum_object_size_in_memory 1024 KB
shutdown_lifetime 5 seconds
client_db off

The server has two dual core processors, 8 GB of RAM and two 15K hard
drives for my aufs cache volumes.
I just put the server into production and it has about 50 users configured
to use the proxy.

Any help is appreciated.

Thank you,

Mike Grasso
Data Network Administrator
DC Circuit Court of Appeals
(202) 216-7443
Received on Mon Feb 07 2011 - 15:40:50 MST