[squid-users] High CPU utilization

Hello.
Recently we have added a lot more clientes behind a squid proxy, and now cpu
utilizitaion is usually 70-95%. The processor is a intel dual core 2160 @
1.80GHz. Users started complaing about the speed on accessing pages, and the
link is fine.

Here is squidclient mgr:info:

Squid Object Cache: Version 2.6.STABLE5
Start Time: Fri, 24 Jul 2009 20:19:16 GMT
Current Time: Mon, 27 Jul 2009 19:09:07 GMT
Connection information for squid:
        Number of clients accessing cache: 1561
        Number of HTTP requests received: 8590404
        Number of ICP messages received: 0
        Number of ICP messages sent: 0
        Number of queued ICP replies: 0
        Number of HTCP messages received: 0
        Number of HTCP messages sent: 0
        Request failure ratio: 0.00
        Average HTTP requests per minute since start: 2021.3
        Average ICP messages per minute since start: 0.0
        Select loop called: 122560206 times, 2.081 ms avg
Cache information for squid:
        Request Hit Ratios: 5min: 23.0%, 60min: 21.9%
        Byte Hit Ratios: 5min: 13.3%, 60min: 14.7%
        Request Memory Hit Ratios: 5min: 16.3%, 60min: 17.0%
        Request Disk Hit Ratios: 5min: 26.3%, 60min: 29.9%
        Storage Swap size: 4609784 KB
        Storage Mem size: 65692 KB
        Mean Object Size: 15.67 KB
        Requests given to unlinkd: 455490
Median Service Times (seconds) 5 min 60 min:
        HTTP Requests (All): 1.24267 1.46131
        Cache Misses: 1.54242 1.81376
        Cache Hits: 0.28853 0.30459
        Near Hits: 1.31166 1.62803
        Not-Modified Replies: 0.23230 0.23230
        DNS Lookups: 0.29097 0.31806
        ICP Queries: 0.00000 0.00000
Resource usage for squid:
        UP Time: 254991.358 seconds
        CPU Time: 56029.670 seconds
        CPU Usage: 21.97%
        CPU Usage, 5 minute avg: 94.38%
        CPU Usage, 60 minute avg: 93.36%
        Process Data Segment Size via sbrk(): 193008 KB
        Maximum Resident Size: 0 KB
        Page faults with physical i/o: 70
Memory usage for squid via mallinfo():
        Total space in arena: 193008 KB
        Ordinary blocks: 179871 KB 6058 blks
        Small blocks: 0 KB 0 blks
        Holding blocks: 1080 KB 2 blks
        Free Small blocks: 0 KB
        Free Ordinary blocks: 13136 KB
        Total in use: 180951 KB 93%
        Total free: 13136 KB 7%
        Total size: 194088 KB
Memory accounted for:
        Total accounted: 111416 KB
        memPoolAlloc calls: 973288506
        memPoolFree calls: 972077571
File descriptor usage for squid:
        Maximum number of file descriptors: 4096
        Largest file desc currently in use: 1604
        Number of file desc currently in use: 1308
        Files queued for open: 0
        Available number of file descriptors: 2788
        Reserved number of file descriptors: 100
        Store Disk files open: 30
        IO loop method: epoll
Internal Data Structures:
        300182 StoreEntries
         14733 StoreEntries with MemObjects
         14414 Hot Object Cache Items
        294106 on-disk objects

And here is part of of squid.conf:

http_port 3128
visible_hostname xxx
hierarchy_stoplist cgi-bin ?
acl QUERY urlpath_regex cgi-bin \?
cache deny QUERY
acl apache rep_header Server ^Apache
broken_vary_encoding allow apache
access_log /var/log/squid/access.log squid
cache_store_log none
hosts_file /etc/hosts

#
----------------------------------------------------------------------------------------------------------
cache_mem 64 MB
cache_dir ufs /var/spool/squid 5000 50 256
cache_replacement_policy heap LFUDA
maximum_object_size 51200 KB
maximum_object_size_in_memory 64 KB
memory_replacement_policy heap GDSF
logfile_rotate 3

#
----------------------------------------------------------------------------------------------------------
refresh_pattern ^ftp: 1440 20% 10080
refresh_pattern ^gopher: 1440 0% 1440
refresh_pattern . 0 20% 4320
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 to_localhost dst 127.0.0.0/8

max_open_disk_fds 2046

# timeouts
connect_timeout 30 seconds
shutdown_lifetime 5 seconds
forward_timeout 2 minutes
pconn_timeout 30 seconds
persistent_request_timeout 1 minute
request_timeout 2 minute

Is there anything that i can do to lower the cpu utilization, or do i have
to upgrade the hardware?
Thanks.

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