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

[Zoltan Hoppar]

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>

> With this squid configuration:
> acl localnet src 172.16.0.0/12
> acl localnet src 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
> 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
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