squid+wccp Byte Hit Ratios为负值的问题

huzi1986

现有一项目是采用wccp + squid 做互联网上的cache

网络结构是这样

CISCO6507路由器   （开启wccp协议） ----huawei交换机  ------------>squid

大致网络图


eth0 为外网，eth1为内网。用户数据走eth1通过wccp+squid 来中转

开始测试是没有问题，之后内外网地址发生过变换（wccp 和网络是由cisco工程师来负责，我负责squid）。突然流量内外网值出现异常情况（）正好相反！现在是一台硬设备用xen虚拟8个linux来跑的。8台的Byte Hit Ratios都为负值，现贴一台的mgr::info的信息


squid 版本为squid2.7 stable 7

1. 
   
2. [root@cache1 ~]# /usr/local/squid2.7/bin/squidclient -h localhost -p 3128 mgr:info
   
3. HTTP/1.0 200 OK
   
4. Server: squid/2.7.STABLE7
   
5. Date: Wed, 17 Mar 2010 12:57:52 GMT
   
6. Content-Type: text/plain
   
7. Expires: Wed, 17 Mar 2010 12:57:52 GMT
   
8. X-Cache: MISS from cache1.lovebsd.com
   
9. Via: 1.0 cache1.lovebsd.com:3128 (squid/2.7.STABLE7)
   
10. Connection: close
    
11. 
    
12. Squid Object Cache: Version 2.7.STABLE7
    
13. Start Time:     Wed, 17 Mar 2010 01:07:30 GMT
    
14. Current Time:   Wed, 17 Mar 2010 12:57:52 GMT
    
15. Connection information for squid:
    
16.         Number of clients accessing cache:      8928
    
17.         Number of HTTP requests received:       3845503
    
18.         Number of ICP messages received:        29514404
    
19.         Number of ICP messages sent:    29518544
    
20.         Number of queued ICP replies:   0
    
21.         Request failure ratio:   0.00
    
22.         Average HTTP requests per minute since start:   5413.3
    
23.         Average ICP messages per minute since start:    83100.9
    
24.         Select loop called: 89649053 times, 0.475 ms avg
    
25. Cache information for squid:
    
26.         Request Hit Ratios:     5min: 43.3%, 60min: 44.4%
    
27.         Byte Hit Ratios:        5min: -102.1%, 60min: -71.3%
    
28.         Request Memory Hit Ratios:      5min: 12.9%, 60min: 12.0%
    
29.         Request Disk Hit Ratios:        5min: 35.5%, 60min: 39.6%
    
30.         Storage Swap size:      62665332 KB
    
31.         Storage Mem size:       2097052 KB
    
32.         Mean Object Size:       30.40 KB
    
33.         Requests given to unlinkd:      685362
    
34. Median Service Times (seconds)  5 min    60 min:
    
35.         HTTP Requests (All):   0.07409  0.07014
    
36.         Cache Misses:          0.32154  0.33943
    
37.         Cache Hits:            0.00000  0.00000
    
38.         Near Hits:             0.07825  0.09219
    
39.         Not-Modified Replies:  0.00000  0.00000
    
40.         DNS Lookups:           0.04048  0.04048
    
41.         ICP Queries:           0.00185  0.00145
    
42. Resource usage for squid:
    
43.         UP Time:        42622.619 seconds
    
44.         CPU Time:       1610.809 seconds
    
45.         CPU Usage:      3.78%
    
46.         CPU Usage, 5 minute avg:        7.35%
    
47.         CPU Usage, 60 minute avg:       7.59%
    
48.         Process Data Segment Size via sbrk(): 3161232 KB
    
49.         Maximum Resident Size: 0 KB
    
50.         Page faults with physical i/o: 1
    
51. Memory usage for squid via mallinfo():
    
52.         Total space in arena:  -1051760 KB
    
53.         Ordinary blocks:       -1070411 KB      0 blks
    
54.         Small blocks:               0 KB      0 blks
    
55.         Holding blocks:             0 KB      0 blks
    
56.         Free Small blocks:      16942 KB
    
57.         Free Ordinary blocks:    1708 KB
    
58.         Total in use:          -1070411 KB 102%
    
59.         Total free:             18650 KB -1%
    
60.         Total size:            -1051760 KB
    
61. Memory accounted for:
    
62.         Total accounted:       2562900 KB
    
63.         memPoolAlloc calls: 530438129
    
64.         memPoolFree calls: 520857193
    
65. File descriptor usage for squid:
    
66.         Maximum number of file descriptors:   65536
    
67.         Largest file desc currently in use:   1717
    
68.         Number of file desc currently in use: 1555
    
69.         Files queued for open:                   0
    
70.         Available number of file descriptors: 63981
    
71.         Reserved number of file descriptors:   100
    
72.         Store Disk files open:                  60
    
73.         IO loop method:                     epoll
    
74. Internal Data Structures:
    
75.         2061793 StoreEntries
    
76.         123072 StoreEntries with MemObjects
    
77.         122735 Hot Object Cache Items
    
78.         2061431 on-disk objects

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huzi1986

huzi1986

应该是eth1的流量大，eth注入的流量低。现在刚好相反！ 请大家提提建议

huzi1986

fsm11

是不是 squid 计数器溢出

config t

squid + wccp 不是什么好选择,出现故障时无法提示..等到用户大量投诉后我们才知道原来是wccp那里的问题

我们曾经测试过,也拿了很多厂商的产品来测试..效果都还好.就是出现问题是无法跳过cache...

现在已经改成使用反向代理的方式来解决