squid consuming near all (95+ %) CPU, it is normal?

[Frantisek Hanzlik]

Zoltan Hoppar wrote:
> Hi,
> 
> Try to use smokeping - http://oss.oetiker.ch/smokeping/
> https://www.youtube.com/watch?v=kRGhIVQVcx0
> 
> Maybe this helps you what causing you problems.
> 
> HTH,
> 
> Zoltan
> 
> 2012/11/11 Frantisek Hanzlik <franta at hanzlici.cz <mailto:franta at hanzlici.cz>>
> 
>     With this squid configuration:
>     acl localnet src 172.16.0.0/12 <http://172.16.0.0/12>
>     acl localnet src 192.168.0.0/16 <http://192.168.0.0/16>
>     acl SSL_ports port 443
>     acl SSL_ports port 85
>     acl SSL_ports port 81
>     acl SSL_ports port 5443
>     acl Safe_ports port 80
>     acl Safe_ports port 21
>     acl Safe_ports port 443
>     acl Safe_ports port 70
>     acl Safe_ports port 210
>     acl Safe_ports port 1025-65535
>     acl Safe_ports port 280
>     acl Safe_ports port 488
>     acl Safe_ports port 591
>     acl Safe_ports port 777
>     acl Safe_ports port 5443
>     acl Safe_ports port 85
>     acl Safe_ports port 81
>     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 localnet
>     http_access allow localhost
>     http_access deny all
>     http_port 3128
>     hierarchy_stoplist cgi-bin ?
>     cache_dir ufs /var/spool/squid 1000 16 256 max-size=999000
>     cache_mem 512 MB
>     maximum_object_size 4096 KB
>     memory_pools off
>     cache_swap_low 90
>     cache_swap_high 95
>     dns_nameservers 172.16.1.1
>     client_db off
>     half_closed_clients off
>     max_filedesc 4096
>     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 .               0       20%     4320
>     acl users  src 172.31.0.0/16 <http://172.31.0.0/16>
>     delay_pools 1
>     delay_class 1 2
>     delay_parameters 1 5000000/10000000 5000000/10000000
>     delay_access 1 allow users
> 
>     squid very often load CPU at near 100%, with cca 200 users and 4000
>     connections (~2000 to users, 2000 to internet). Removing delay pool
>     configuration has no big effect.
>     HW configuration: Dual core E8500 at 3.16GHz CPU, 4GB RAM, 2x SATA 7k2
>     Raid Edition disks in SW RAID1 for squid cache (disk performance
>     seems isn't problem, IOWAIT is small).
>     It is squid-3.2.3.20121106.r11695-1.fc14.i686 on Fedora 14 i686
>     (I test it with some older squid 3.1 version and same configuration,
>     but results were same, or rather worse)
> 
>     It this CPU load normal, or can be there done some performance
>     tunnning for it?
> 
>     Thanks in advance, Fr. Hanzlik
>     --

Hello Zoltan, thanks for Your recommendation. But I think internet
line (~ 800+ Mbps, latency is fine) isn't problem there. With or
without squid there are no network problems.
FH