Re: [RFC] Unify KVM kernel-space and user-space code into a singleproject

[Anthony Liguori]

On 03/18/2010 06:48 AM, Ingo Molnar wrote:
> * Avi Kivity<avi@xxxxxxxxxx>  wrote:
>
>    
> > On 03/18/2010 12:50 PM, Ingo Molnar wrote:
> >      
> > > * Avi Kivity<avi@xxxxxxxxxx>   wrote:
> > >
> > >        
> > > > > The moment any change (be it as trivial as fixing a GUI detail or as
> > > > > complex as a new feature) involves two or more packages, development speed
> > > > > slows down to a crawl - while the complexity of the change might be very
> > > > > low!
> > > > >            
> > > > Why is that?
> > > >          
> > > It's very simple: because the contribution latencies and overhead compound,
> > > almost inevitably.
> > >        
> > It's not inevitable, if the projects are badly run, you'll have high
> > latencies, but projects don't have to be badly run.
> >      
> So the 64K dollar question is, why does Qemu still suck?
>    

Why does Linux AIO still suck?  Why do we not have a proper interface in 
userspace for doing asynchronous file system operations?

Why don't we have an interface in userspace to do zero-copy transmit and 
receive of raw network packets?

The lack of a decent userspace API for asynchronous file system 
operations is a huge usability problem for us.  Take a look at the 
complexity of our -drive option.  It's all because the kernel gives us 
sucky interfaces.

Regards,

Anthony Liguori
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