Hi David,

quoted

quoted

So sendfile() as a concept (whether you use combinations of splice()
system calls or the sendfile system call itsefl) isn't necessarily
only about the zero-copy, it's really also about avoiding the user
space memory management.

I don't think so. Ok, maybe for webservers just serving tiny
html files, that's true. But for me with Samba it's really the
copy_to/from_iter() that is the major factor.

Is that copy also doing the ip checksum?

Not in my tests. I guess there's offload in the network hardware
for this.

At least at the syscall layer of sendmsg() there's no checksuming
happening.

metze