squid 2.7 命中率极低，求教~！

yiqieyxk

Cache information for squid:
        Request Hit Ratios:     5min: 58.0%, 60min: 59.3%
        Byte Hit Ratios:        5min: 50.4%, 60min: 52.6%
        Request Memory Hit Ratios:      5min: 29.8%, 60min: 30.2%
        Request Disk Hit Ratios:        5min: 60.7%, 60min: 55.5%
        Storage Swap size:      266652528 KB
        Storage Mem size:       938836 KB
        Mean Object Size:       16.66 KB
        Requests given to unlinkd:      13457
做的是图片缓存，50%很低
查看日志
2010/06/02 14:10:56| ctx: enter level  0: 'http://img1.cache.netease.com/cnews/vdo/gobal/news_vdo_nav.css'
2010/06/02 14:10:56| storeClientReadHeader: URL mismatch
2010/06/02 14:10:56|    {} != {http://img1.cache.netease.com/cnews/vdo/gobal/news_vdo_nav.css}
2010/06/02 14:11:02| ctx: exit level  0
2010/06/02 14:11:02| storeClientReadHeader: no URL!
2010/06/02 14:11:02| storeClientReadHeader: no URL!
2010/06/02 14:11:04| storeClientReadHeader: no URL!
2010/06/02 14:11:14| storeClientReadHeader: no URL!
2010/06/02 14:11:15| storeClientReadHeader: no URL!
2010/06/02 14:11:15| storeClientReadHeader: no URL!
2010/06/02 14:11:15| storeClientReadHeader: no URL!
2010/06/02 14:11:15| storeClientReadHeader: no URL!
2010/06/02 14:11:16| storeClientReadHeader: no URL!
2010/06/02 14:11:16| storeClientReadHeader: no URL!
2010/06/02 14:11:17| storeClientReadHeader: no URL!
2010/06/02 14:11:17| storeClientReadHeader: no URL!
2010/06/02 14:11:18| storeClientReadHeader: no URL!
2010/06/02 14:11:18| ctx: enter level  0: 'http://i2.itc.cn/20100601/622_b49691ec_0423_4d2a_94c5_45784f318925_0.jpg'
2010/06/02 14:11:18| storeClientReadHeader: URL mismatch
2010/06/02 14:11:18|    {} != {}
2010/06/02 14:11:25| ctx: exit level  0
2010/06/02 14:11:25| storeClientReadHeader: no URL!
2010/06/02 14:11:26| storeClientReadHeader: no URL!
2010/06/02 14:11:28| storeClientReadHeader: no URL!
2010/06/02 14:11:31| storeClientReadHeader: no URL!


大面积的类似内容？什么问题呢  求教了~！