Slower performance with ext4

[Mark Kirkwood]

Christopher Chan wrote:
>
> No, it is more a problem of the myth of fsync guaranteeing data is 
> committed to the filesystem every time.
>
> http://www.opengroup.org/onlinepubs/009695399/functions/fsync.html
>
>
> Not even the specification explicitly spells that out.
>
>
> ext4 fsync is only safe if data=journal is used and write-caches are 
> either disabled or have a bbu.
>
>   

Sigh - write cache disabled *or* write barriers supported by underlying 
device....

regards

Mark