tproxy squid bridge very slow when cache is full

Posted by Roberto on Server Fault See other posts from Server Fault or by Roberto
Published on 2011-03-23T11:55:57Z Indexed on 2012/06/28 3:18 UTC
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I have installed a bridge tproxy proxy in a fast server with 8GB ram. The traffic is around 60Mb/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 proxy server becomes unusable.

Any hints of what may be happening?

I'm using:

linux- iptables- squid-3.1.1

compiled with these options:

./configure --prefix=/usr --mandir=/usr/share/man --infodir=/usr/share/info --datadir=/usr/share --localstatedir=/var/lib --sysconfdir=/etc/squid --libexecdir=/usr/libexec/squid --localstatedir=/var --datadir=/usr/share/squid --enable-removal-policies=lru,heap --enable-icmp --disable-ident-lookups --enable-cache-digests --enable-delay-pools --enable-arp-acl --with-pthreads --with-large-files --enable-htcp --enable-carp --enable-follow-x-forwarded-for --enable-snmp --enable-ssl --enable-async-io=32 --enable-linux-netfilter --enable-epoll --disable-poll --with-maxfd=16384 --enable-err-languages=Spanish --enable-default-err-language=Spanish

My squid.conf:

cache_mem 100 MB memory_pools off

acl manager proto cache_object acl localhost src acl localhost src ::1/128 acl to_localhost dst acl to_localhost dst ::1/128

acl localnet src # RFC1918 possible internal network acl localnet src # RFC1918 possible internal network acl localnet src # 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

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

http_access allow manager localhost http_access deny manager

http_access deny !Safe_ports

http_access deny CONNECT !SSL_ports

http_access allow net-g1

from where browsing should be allowed http_access allow localnet http_access allow localhost

http_access deny all

http_port 3128 http_port 3129 tproxy

hierarchy_stoplist cgi-bin ?

cache_dir ufs /var/spool/squid 8000 16 256

access_log none

cache_log /var/log/squid/cache.log

coredump_dir /var/spool/squid

refresh_pattern ^ftp: 1440 20% 10080 refresh_pattern ^gopher: 1440 0% 1440 refresh_pattern -i (/cgi-bin/|\?) 0 0% 0 refresh_pattern .

I have this issue when the cache is full, but do not really know if it is because of that.

Thanks in advance and sorry my english.


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