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limit squid memory ram use - squid becomes slow when ram full

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Hi

How I can limit the ram memory use in my squid/tproxy box ?

I have a fast server with 16Gb ram. The average bandwidth is about 60-70
Mb/s.

The bridge works well but when the cache and memory becomes full its goes
slow and becomes unusable.

The cache is 10G size.

I see that a few hours to be working and have used the 16 GB of RAM 
starts to run slow.

Any help ?. I have configured some memory optimization options but looks
don't help for me.

Thanks in advance

roberto

This is my config:

-------------------------------------

cache_mem 10 MB
memory_pools off
cache_swap_low 94
cache_swap_high 95

#
# 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 200.117.xxx.xxx/24
acl net-g2 src 200.xxx.xxx.xxx/24
acl net-g3 src 190.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
http_access allow net-g2
http_access allow net-g3

#
# 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 10000 64 256

#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 .		0	20%	4320





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