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原创 W.Richard Stevens Books
1.TCP/IP Illustrated, Volume 1 了解网络最有用的一本书,读完后对于TCP/IP的网络分层会有一个相当不错的理解,知道数据是如何传输的,UDP是怎么回事,TCP又是怎么回事,为什么TCP可靠,UDP不可靠,了解各种协议,出色就出色在用tcpdump抓packets后做详细的解释,为下面的卷二做准备。2.TCP/IP Illustrated, Volume
2010-02-12 11:57:00
901
原创 I/O的几种模型
1.blocking I/O最常见的是blocking I/O, 系统调用会阻塞,直到这个系统调用返回,一般来说都有一个在user space切换到kernel space,然后再切回来的过程2.nonblocking I/O即使系统调用不能达到预期的目标也会立即返回,一般的实现会持续的poolling, 但这么做往往耗费大量的CPU时间,这种方式偶尔会碰到,一般是在专门提供某种功能的
2010-02-03 14:28:00
534
原创 Throughput of UTM Device Enhancements (Incomplete)
Throughput is very important benchmark of UTM Security Device.Recently, I received an issue. If the packets of tcp stream are out of order or lost, UTM throught will be decresed much.How To slove
2010-01-29 15:41:00
379
原创 DDNS3322 Protocol Introduction (Design)
DDNS is a service that maps Internet domain names to IP addresses dynamically. An IP Registry provides a public central database where information such as hostnames, IPs etc. can be stored and retr
2010-01-29 13:50:00
903
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