Re: [PATCH 0/3] vmsplice: make vmsplice a trivial wrapper for preadv2/pwritev2

Hi David,

>>> 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