Re: [Qemu-devel] [PATCH] QEMU: change default disk cache behavior

[Anthony Liguori]

On 05/20/2010 08:49 AM, Jes Sorensen wrote:
> On 05/20/10 15:40, Anthony Liguori wrote:
>    
> > On 05/20/2010 08:36 AM, Jes Sorensen wrote:
> >      
> > > > And I strongly suspect that such a blanket change would be wrong but
> > > > that a more targeted change like making cache=none default for physical
> > > > devices would satisfy mostly everyone.
> > > >
> > > >          
> > > Is there any other thing than physical devices attached to the -drive
> > > parameter?
> > >        
> > Image files which are the overwhelming more common use-case.
> >      
> For image files we certainly want it too, at least for proper ones (ie.
> raw).

What makes you say that?

>   It could be that it causes problems for qcow2.
>    

It's definitely the wrong thing for qcow2 with backing files.

Regards,

Anthony Liguori

> I'll try and look at it when I am back.
>
> Cheers,
> Jes
>
>