Re: [Qemu-devel] Transforming stdin and stdout pair into a socket

[Anthony Liguori]

Paul Brook wrote:
> >     I've seen socat, and I could use it as you described. My only
> > objection to this solution is that there is an unneeded process in the
> > middle that just pipes data around...
> >
> >    (Instead of socat, I think it would be more efficient to just write
> > a simple application that uses the "new" Linux syscall "splice" that
> > I've just found by mistake yesterday...)
> >     
>
> In that case you need to fix socat to use splice() when available. I have a 
> hard time believing socat adds measurable overhead, especially if you're 
> already tunnelling over ssh.
>   

splice() doesn't really buy you anything when copying from a socket to 
another socket.  The data is going to get copied just like it would if 
you dropped to userspace.  It's useful if you introduce pipe-to-pipe 
copies because they'll be eliminated but if you're going from socket -> 
pipe -> socket it'll be the same as using socat.

Regards,

Anthony Liguori
> Paul
>