[Qemu-devel] Re: [PATCH] Add cache=volatile parameter to -drive

[Alexander Graf]

On 17.05.2010, at 15:09, Anthony Liguori wrote:

> On 05/17/2010 08:02 AM, Alexander Graf wrote:
>>> My concern is that ext3 exaggerates the cost of fsync() which will result 
>>> in diminishing value over time for this feature as people move to 
>>> ext4/btrfs.
>>>     
>> There will be ext3 file systems for years out. Just because people can use 
>> better and faster file systems doesn't mean they do. And I'm sure they can't 
>> always choose. If anything, I can try and see what the numbers look like for 
>> xfs.
>>   
> 
> But ext3 with barrier=1 is pretty uncommon in practice.  Another data point 
> would be an ext3 host file system with barrier=0.

Who defines what is common and what not? To me, the SLES11 default is common. 
In fact, the numbers in the referred mail were done on an 11.1 system.


Alex