[SQU] Ratio of phyiscal I/O to http requests is high and rising

I have followed all the suggestions to lower memory use in the FAQ.
Any ideas?

Squid Object Cache: Version 2.3.STABLE4

Start Time: Fri, 12 Jan 2001 09:50:53 GMT
Current Time: Fri, 12 Jan 2001 20:06:09 GMT

Connection information for squid:
        Number of clients accessing cache: 982
        Number of HTTP requests received: 401374
        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: 652.4
        ICP messages per minute: 0.0
        Select loop called: 3032125 times, 12.175 ms avg
Cache information for squid:
        Request Hit Ratios: 5min: 50.0%, 60min: 50.0%
        Byte Hit Ratios: 5min: 16.2%, 60min: 15.3%
        Storage Swap size: 3152015 KB
        Storage Mem size: 5108 KB
        Storage Replacement Threshold: -1.000000
        Mean Object Size: 10.13 KB
        Requests given to unlinkd: 11212
Median Service Times (seconds) 5 min 60 min:
        HTTP Requests (All): 0.16775 0.20843
        Cache Misses: 0.68577 0.64968
        Cache Hits: 0.05046 0.02451
        Near Hits: 0.37825 0.33943
        Not-Modified Replies: 0.01035 0.01035
        DNS Lookups: 0.00278 0.00278
        ICP Queries: 0.00000 0.00000
Resource usage for squid:
        UP Time: 36916.425 seconds
        CPU Time: 11309.910 seconds
        CPU Usage: 30.64%
        CPU Usage, 5 minute avg: 31.57%
        CPU Usage, 60 minute avg: 42.22%
        Maximum Resident Size: 0 KB
        Page faults with physical i/o: 120730
Memory usage for squid via mallinfo():
        Total space in arena: 48592 KB
        Ordinary blocks: 43525 KB 14857 blks
        Small blocks: 0 KB 0 blks
        Holding blocks: 1644 KB 3 blks
        Free Small blocks: 0 KB
        Free Ordinary blocks: 5066 KB
        Total in use: 45169 KB 93%
        Total free: 5066 KB 10%
Memory accounted for:
        Total accounted: 26005 KB
File descriptor usage for squid:
        Maximum number of file descriptors: 1024
        Largest file desc currently in use: 222
        Number of file desc currently in use: 188
        Files queued for open: 0
        Available number of file descriptors: 836
        Reserved number of file descriptors: 100
        Store Disk files open: 1
Internal Data Structures:
        312195 StoreEntries
          1186 StoreEntries with MemObjects
          1153 Hot Object Cache Items
        311255 Filemap bits set
        311255 on-disk objects

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