squid not running efficiently

i am running squid Transparent proxy-cache on

IBM netfinity 5000
redhat linux 6.1
squid 2.2STABLE4
cache size : 2 SCSI 4GIG disk
RAM : 512 MB

 squid.conf settings are
1> cache_mem 64 MB
2> memory_pools off
3> refesh_pattern . 0 50% 4320
4> avg_object_size 10 kb
5> first level cache directory 16
6> second level cache directory 256

    now the problem is after serving 500000 to 600000
http requests squid becones very slow ,avg no of
requests per day is aroung 100 to 150 thousend
    also in cachemanager manu->
    general run time info

its showing following things
   please see -> request send to unlinked ->i think
its too high
   also the median service time for tcp-miss -> around

4-5 seconds and its increasing gradually
   
   please suggest what could be the problem

Connection information for squid: Number of clients
accessing cache: 151
        Number of HTTP requests received: 84613 Number of ICP
messages received: 0
        Number of ICP messages sent: 0
        Number of queued ICP replies: 0
        Request failure ratio: 0.00%
        HTTP requests per minute: 279.8
        ICP messages per minute: 0.0
        Select loop called: 875237 times, 20.734 ms
avg

Cache information for squid:
Request Hit Ratios: 5min: 43.7%, 60min: 39.9%
        Byte Hit Ratios: 5min: 28.2%, 60min: 24.2%
Storage Swap size: 119590 KB
Storage Mem size: 65520 KB
torage LRU Expiration Age: 7.00 days
Mean Object Size: 5.90 KB Requests given to unlinkd:
1351

Median Service Times (seconds) 5 min 60 min:
HTTP Requests (All): 1.11539 1.00114
cache Misses: 5.63745 4.30363
Cache Hits: 0.01955 0.02069 Near hits:
           3.86308 1.38447
Not-Modified Replies: 0.01387 0.01235 DNS Lookups:
          0.02941 0.02683
ICP Queries: 0.00000 0.00000

Memory usage for squid via mallinfo():
        Total space in arena: 105826 KB
        Ordinary blocks: 86541 KB 9434 blks
        Small blocks: 0 KB 0 blks
        Holding blocks: 176 KB 1 blks Free
Small blocks: 0 KB
        Free Ordinary blocks: 19285 KB
        Total in use: 86717 KB 82%
        Total free: 19285 KB 18%
       Memory accounted for:
        Total accounted: 78558 KB

File descriptor usage for squid: Maximum number of
file descriptors: 1024
        Largest file desc currently in use: 432
        Number of file desc currently in use: 336
        Files queued for open: 0
        Available number of file descriptors: 688
        Reserved number of file descriptors: 100
        Store Disk files open: 30

Internal Data Structures:
         20638 StoreEntries
         13786 StoreEntries with MemObjects
         13656 Hot Object Cache Items
         20295 Filemap bits set 20278 on-disk objects

please help me i am new to squid
thanks in advance

prashant desai
Network administrator
worldgate networks pvt. ltd.
India

network administrator
__________________________________________________
Do You Yahoo!?
Talk to your friends online with Yahoo! Messenger.
http://im.yahoo.com
Received on Fri Feb 11 2000 - 04:16:50 MST