Ques on smb-3.5.12

[Learner Study]

Hi,

I'd like to use recvfile with samba 3-5.12 release with latest Fedora
core 17 (kernel 3.3.4). However, this kernel release doesn't support
recvfile. Hence performance is really bad if I enable recvfile option
in samba config.

I tried to check old samba archives and found following relevant:
http://samba.2283325.n4.nabble.com/recvfile-by-linux-splice-td2474663.html
http://samba.2283325.n4.nabble.com/Socket-draining-for-sys-recvfile-patch-for-reverse-sendfile-td4225013.html

#2 above, recvfile should work with 3.5.x kernel and 3.5.11+
samba...is that correct?

Could someone please provide some performance improvement numbers w/
and w/o recvfile?

Thanks!