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

[Anthony Liguori <aliguori@linux.vnet.ibm.com>]

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
>
>