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

[Anthony Liguori <anthony@codemonkey.ws>]

On 05/20/2010 08:36 AM, Jes Sorensen wrote:
> On 05/20/10 14:30, Anthony Liguori wrote:
>    
>> On 05/20/2010 04:32 AM, Jes.Sorensen@redhat.com wrote:
>>      
>>> Therefore, here is a patch that does two things:
>>>    - default to "nocache"
>>>    - in case of failure with nocache, retry with "write-back"
>>>
>>>        
>> This sort of change requires performance data in a variety of
>> circumstances to justify.
>>
>> 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.

Regards,

Anthony Liguori

> If so, I can take a look at making it more generic when I am back from
> holiday next week.
>
> Jes
>
>