cachemgr.cgi显示的吞吐量为什么和cacti监控到的不一致啊

zysno1

sample_start_time = 1216026690.845838 (Mon, 14 Jul 2008 09:11:30 GMT)
sample_end_time = 1216026990.847895 (Mon, 14 Jul 2008 09:16:30 GMT)
client_http.requests = 732.711643/sec
client_http.hits = 727.618344/sec
client_http.errors = 0.000000/sec
client_http.kbytes_in = 287.884693/sec
client_http.kbytes_out = 9236.070005/sec
client_http.all_median_svc_time = 0.000000 seconds
client_http.miss_median_svc_time = 0.074090 seconds
client_http.nm_median_svc_time = 0.000000 seconds
client_http.nh_median_svc_time = 0.050460 seconds
client_http.hit_median_svc_time = 0.000000 seconds

这是我的squid节点通过cachemgr.cgi查看到的状态数据.

client_http.kbytes_out 这一栏应该是squid发出的流量吧？

按照这个数据，只有8M啊。但是我用cacti监控到的流量有80多M。。

这是为什么啊？