[squid-users] tproxy bridge very slow when cache is full

I have installed a bridge tproxy proxy in a fast server with 8GB ram. The
traffic is around 50mb/s.

When I start for first time the proxy (with the cache empty) the proxy
works very well but when the cache becomes full (few hours later) the
bridge goes very slow, the traffic goes below 10mb/s and the web browsing
is very slow.

The proxy server becomes unusable.

Any hints of what may be happening?

I'm using:

linux-2.6.30.10
iptables-1.4.3.2
squid-3.1.1

all compiled form sources.

My squid.conf:
###############################################################

cache_mem 100 MB
memory_pools off

#
# Recommended minimum configuration:
#
acl manager proto cache_object
acl localhost src 127.0.0.1/32
acl localhost src ::1/128
acl to_localhost dst 127.0.0.0/8 0.0.0.0/32
acl to_localhost dst ::1/128

# Example rule allowing access from your local networks.
# Adapt to list your (internal) IP networks from where browsing
# should be allowed
acl localnet src 10.0.0.0/8 # 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
localnet src fc00::/7 # RFC 4193 local private network range acl
localnet src fe80::/10 # RFC 4291 link-local (directly plugged) machines

acl net-g1 src xxx.xxx.xxx.xxx/24

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

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

http_access allow net-g1

#
# 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 3128
http_port 3129 tproxy

# 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_dir ufs /var/spool/squid 8000 16 256

#access_log /var/log/squid/access.log squid
access_log none

cache_log /var/log/squid/cache.log

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

# 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 .

##############################################################

Thanks in advance and sorry my english.

roberto
Received on Tue Mar 22 2011 - 10:49:56 MDT