On Tue, Dec 06, 2005 at 04:06:06AM -0800, kernel coder wrote: > hi, > i'm trying to track the code flow of sendfile system call.Mine > ethernet card doesn't have scatter gather and checksum calculation > features.So stack should be making a copy of data. > > Please tell me where in sendfile code flow,check for scatter gather > and cecksum features is made so that stack can decide whether to copy > data from user space or not. Is your grep really that broken? :) net/ipv4/tcp.c:tcp_sendpage() is where you find the check and fallback to sendmsg if you follow it through. -Matt
