On Tue, Jun 26, 2012 at 11:47:15PM -0600, Stefan Priebe - Profihost AG wrote:

Yes i will do so. Right now i was trying to compare discard with non 
discard with this simple command:
for i in `seq 0 1 1000`; do dd if=/dev/zero of=t_$i bs=4M count=1; rm 
t_$i; done;

But i hit a new bug:

Fixed this one with

Btrfs: hold a ref on the inode during writepages

Apply that and carry on with your tests :).  Thanks,

Josef