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Re: slower connections using squid (squid is slowing down all connections)

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Hello all,

I'm comming back with new info:
- i rebuilded from src.rpm and upgraded from squid-2.5.STABLE6-3.4E.11 to 
squid-2.5.STABLE11-1.FC3!
After upgrade, no semnificative improvements regarding my problem (between 
11AM up 15PM my squid become slower - connections are worse then a dial-up 
connection)

- i recorded CPU Load, Free Memory, New TCP Connections, Established TCP 
Connections via snmp. 

CPU average=4% (with max 25%) so.... super fine!
Free Memory = 24M !!!!!! I have installed on my serverv 1G Reg Ecc available 
(plus 2Gb swap). Swap still remain unused and from phisycal memory it remain 
18-24M free.

Connection information for squid:
 Number of clients accessing cache: 130
 Number of HTTP requests received: 482956
 Average HTTP requests per minute since start: 163.7
 Select loop called: 4295056 times, 41.213 ms avg

Before to order more memory, i would like to know if there is something wrong 
in my squid.conf.

# cat /etc/squid/squid.conf
http_port 3128
hierarchy_stoplist cgi-bin ?
acl QUERY urlpath_regex cgi-bin \?
no_cache deny QUERY
cache_mem 256 MB
maximum_object_size 32768 KB
maximum_object_size_in_memory 64 KB
cache_replacement_policy heap GDSF
memory_replacement_policy heap GDSF
cache_dir aufs /var/spool/squid 20480 16 256
cache_store_log none
ftp_user squid@xxxxxxxxx
auth_param basic children 100
auth_param basic realm Squid proxy-caching server
auth_param basic program /usr/lib/squid/pam_auth
auth_param basic credentialsttl 2 hours
auth_param basic casesensitive off
refresh_pattern ^ftp:           1440    20%     10080
refresh_pattern ^gopher:        1440    0%      1440
refresh_pattern .               0       20%     4320
half_closed_clients off
acl all src 0.0.0.0/0.0.0.0
acl manager proto cache_object
acl localhost src 127.0.0.1/255.255.255.255
acl lanpass proxy_auth REQUIRED
acl to_localhost dst 127.0.0.0/8
acl SSL_ports port 443 563
acl Safe_ports port 80          # http
acl Safe_ports port 21          # ftp
acl Safe_ports port 443 563     # https, snews
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 localhost
http_access allow lanpass
http_access deny all
http_reply_access allow all
icp_access allow all
cache_mgr admin@xxxxxxxxx
visible_hostname proxy.mydoom.ro
announce_period 0
log_icp_queries off
cachemgr_passwd *** all
buffered_logs on
coredump_dir /var/spool/squid
client_persistent_connections off

What is not mentioned above (in squid.conf) has default value!

Top say the same thing... see below results sorted by memory usage:

top - 10:03:14 up 2 days,  7:11,  3 users,  load average: 0.36, 0.33, 0.29
Tasks: 171 total,   1 running, 170 sleeping,   0 stopped,   0 zombie
Cpu(s):  4.0% us,  4.5% sy,  0.0% ni, 89.4% id,  0.0% wa,  0.3% hi,  1.8% si
Mem:   1034680k total,  1014068k used,    20612k free,    68500k buffers
Swap:  2008084k total,      144k used,  2007940k free,   491916k cached

  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND
 4537 squid     15   0  453m 288m 1792 S  5.3 28.5  11:52.43 squid
 4539 squid     17   0 30440  28m  676 S  0.0  2.8   0:06.38 pam_auth
 2901 mysql     16   0  120m  18m 3480 S  0.0  1.8   0:00.11 mysqld

Any ideas?
Alex

On Saturday 24 September 2005 21:15, Matus UHLAR - fantomas wrote:
> > > Okay... These look pretty good.  Hits are fast, misses are okay, DNS
> > > requests are about what I would expect...  I'm a bit perplexed.  What
> > > are the symptoms of slow connections?  Is it throughput on large
> > > downloads, pages with lots of connections (msn.com with it's thousands
> > > of images), does it just take forever for a connection to get started,
> > > or is it something else entirely?
>
> On 24.09 15:21, Alex wrote:
> > NO, the situation is very simple: not matter content of page. Even if
> > www.google.com is accesed, it take more then 20-30s to load/display it
> > correctly. Without squid, www.google.com is loaded instantly!
>
> ehm, this might be caused by:
>
> 1. clients connect from IP's not in DNS, and your squid checks for their
>    reverse (and probably direct) DNS informations
> 2. you are requiring ident for them, they are firewalled and don't support
>    ident requests
>
> for 99% it's the first case. turn off dns checking in squid, or better, fix
> your internal DNS.

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