Regarding Zero write recvfile() performance(splice system call)

[Christoph Hellwig]

On Fri, Mar 06, 2015 at 09:46:01AM -0800, Jeremy Allison wrote:
> splice is known to have very bad performance in Linux in this
> case.
> 
> The only known patch to fix this I've posted many times on this
> list (search for it :-). It's considered too ugly by the Linux kernel developers
> to be integrated into the kernel.

It's not just ugly, it's also broken in many ways.  I've offered many
times to implement a proper version on a consulting basis, but not one
was interested in it once it came with a price tag attached.