I might be wrong here, but I think you need your data in kernel memory (fs cache f.ex) to leverage zero copy I/O. Putting things in your process heap would then

I might be wrong here, but I think you need your data in kernel memory (fs cache f.ex) to leverage zero copy I/O. Putting things in your process heap would then be counter productive. Beside there are things doing just that for you. Like varnish.