[資訊] What is zero-copy?

http://stenlyho.blogspot.com/2008/08/zero-copy.html
http://www.linuxjournal.com/article/6345
http://en.wikipedia.org/wiki/Zero-copy
http://www.ibm.com/developerworks/library/j-zerocopy/index.html

什麼是zero-copy?
簡單講就是copy data不經過user的copy，直接由kernel端做掉，如果硬體支援gather，就不需要copy到socket buffer，直接append就可以了，少了copy的行為，減少cpu與memory使用，自然performance就好啦~~~~^^
為啥為看到zero-copy呢?
因為Google protocol buffer有用嚕~~~~^^