Re: [Qemu-devel] [PATCH] block-raw: Make cache=off default again

[Anthony Liguori]

Kevin Wolf wrote:
> Anthony Liguori schrieb:
>   
> > Kevin Wolf wrote:
> >     
> > > Since the patch that suggested it woudl revert qcow2 to writeback caching, in
> > > fact none of the drivers has had cache=off as default any more. This patch
> > > restores the desired behaviour.
> > >   
> > >       
> > When has cache=off ever been the default?
> >
> > Moreover, why would we want to make it the default?  A patch with this 
> > drastic of a change really need a more significant justification in the 
> > change log.
> >     
>
> Hm, you're right. Why is everyone talking about cache=off being default
> except for qcow2? This was confusing me.

qcow2 defaults to writeback whereas everything else defaults to 
writethrough.

So probably taking your patch and s/NOCACHE/CACHE_WT/g would be pretty 
reasonable :-)

Regards,

Anthony Liguori