前年Michael公司的WEB服务器进行了一次平台移植，原来使用的SUN的Solaris，其实Michael感觉真的还是商业的东西好些，拿Solaris和Linux来说吧，Solaris在内存处理上就比RedHat要优秀很多，很多朋友应该都有发现，RedHat运行一段时间过后，内存总是越占用越多，自己不会很好的释放死进程，这一点感觉有点象windows，（好像据说Linux的策略是先占用尽可能多能使用的资源，等有新资源请求的时候再进行清理）呵呵，但是Solaris就感觉不同了，Michael公司以前使用的Solaris做web服务器平台，就512M内存，平时就算很大访问量系统也一直可以保持200M以上的空余内存！
这次安装了RedHat后，不但内存增加到了2G，连CPU也多了一个，呵呵，说真的，性能没有太多提高！不过为了别的一些业务考虑，同时从成本上来说，RedHat的确是个不错的选择，Michael一直也比较喜欢，只不过这次安装后Michael发现Wu－Ftp远程连接特别的慢，以前自己使用其实也发现了，没有太多注意，但这次要给公司其他同事使用，这样肯定会有很多抱怨，以前solaris的时候就特别的快。
查看了相关文档后，Michael发现有的朋友说是反向域名解析得问题，可是不论我怎么设置主机名字解析，还是不好使，我认同一个朋友的说法，认为ftp连接的是ip,跟反向域名解析关系不大，从Wu－Ftp官方上的文章可以得知：
出现ftp连接过慢的原因是wu-ftp有RFC931认证查询的过程，一般有10秒的延时，如果要连接的机器在防火墙后面，且113端口屏蔽的话（RFC931认证通过113端口），会导致连接将近30秒，甚至更长。官方提供的解决办法是：
编辑 /etc/xinetd.d/wu-ftp，将
log_on_success += DURATION USERID
log_on_failure += USERID
两行删掉或者注释掉，重新启动xinetd服务(/etc/init.d/xinetd)！
呵呵，再试试看，怎么样，速度保证不超过3秒！
不明白，为什么默认设置不把它给先设置好了！一般朋友哪知道这些东东呀！
小经验，大家分享一下，如果不正确，欢迎指教！
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