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Always getting negative hit

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Hi,
I have this strange problem started from tonight in my squid box. Actually everything was working ok, but I was trying to do some port forwarding things with iptables. But suddendly i realized that my cache hits has drop after i restarted the networking service quite a few times. At first i wasn't worried, but after an hour I got worried. Although calamaris is showing more byte hit % , unfortunately cachemgr.cgi is showing wrong value i guess. My operating system is a Ubuntu 10.10 server.

Squid Object Cache: Version 3.1.10

Start Time:Sat, 15 Jan 2011 22:17:57 GMT
Current Time:Sat, 15 Jan 2011 23:09:17 GMT

Connection information for squid:
	Number of clients accessing cache:	100
	Number of HTTP requests received:	60132
	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:	1171.5
	Average ICP messages per minute since start:	0.0
	Select loop called: 5143660 times, 0.599 ms avg
Cache information for squid:
	Hits as % of all requests:	5min: 12.3%, 60min: 18.8%
	Hits as % of bytes sent:	5min: -12.5%, 60min: -1.9%
	Memory hits as % of hit requests:	5min: 12.4%, 60min: 4.3%
	Disk hits as % of hit requests:	5min: 50.6%, 60min: 64.5%
	Storage Swap size:	33978424 KB
	Storage Swap capacity:	64.6% used, 35.4% free
	Storage Mem size:	101084 KB
	Storage Mem capacity:	99.7% used,  0.3% free
	Mean Object Size:	16.65 KB
	Requests given to unlinkd:	2605
Median Service Times (seconds)  5 min    60 min:
	HTTP Requests (All):   7.79421  0.61549
	Cache Misses:         26.97993  0.80651
	Cache Hits:            0.01387  0.00919
	Near Hits:             0.58309  0.46965
	Not-Modified Replies:  0.00000  0.00000
	DNS Lookups:           0.51867  0.16304
	ICP Queries:           0.00000  0.00000
Resource usage for squid:
	UP Time:	3079.731 seconds
	CPU Time:	115.800 seconds
	CPU Usage:	3.76%
	CPU Usage, 5 minute avg:	3.81%
	CPU Usage, 60 minute avg:	3.76%
	Process Data Segment Size via sbrk(): 497056 KB
	Maximum Resident Size: 2051920 KB
	Page faults with physical i/o: 0
Memory usage for squid via mallinfo():
	Total space in arena:  497188 KB
	Ordinary blocks:       495769 KB   9420 blks
	Small blocks:               0 KB      0 blks
	Holding blocks:         36380 KB      9 blks
	Free Small blocks:          0 KB
	Free Ordinary blocks:    1418 KB
	Total in use:          532149 KB 100%
	Total free:              1418 KB 0%
	Total size:            533568 KB
Memory accounted for:
	Total accounted:       404284 KB  76%
	memPool accounted:     404284 KB  76%
	memPool unaccounted:   129283 KB  24%
	memPoolAlloc calls:  17894845
	memPoolFree calls:   18064591
File descriptor usage for squid:
	Maximum number of file descriptors:   65535
	Largest file desc currently in use:   1409
	Number of file desc currently in use: 1255
	Files queued for open:                   0
	Available number of file descriptors: 64280
	Reserved number of file descriptors:   100
	Store Disk files open:                  16
Internal Data Structures:
	2041007 StoreEntries
	  8633 StoreEntries with MemObjects
	  8141 Hot Object Cache Items

	2040138 on-disk objects

Please help to understand why I am getting negative hits all of a sudden? And even if it caused by something else, why isn't it be solved after an hour when so many clients are online.

Regards,
Shishir
 		 	   		  


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