Re: [Qemu-devel] [RFC PATCH 1/1] ceph/rbd block driver for qemu-kvm

[Avi Kivity]

On 05/24/2010 11:27 AM, Stefan Hajnoczi wrote:
> On Sun, May 23, 2010 at 1:01 PM, Avi Kivity<address@hidden>  wrote:
>    
> > On 05/21/2010 12:29 AM, Anthony Liguori wrote:
> >      
> > > I'd be more interested in enabling people to build these types of storage
> > > systems without touching qemu.
> > >
> > > Both sheepdog and ceph ultimately transmit I/O over a socket to a central
> > > daemon, right?
> > >        
> > That incurs an extra copy.
> >      
> Besides a shared memory approach, I wonder if the splice() family of
> syscalls could be used to send/receive data through a storage daemon
> without the daemon looking at or copying the data?
>    

Excellent idea.

--
Do not meddle in the internals of kernels, for they are subtle and quick to 
panic.