On Thu, Aug 14, 2008 at 05:00:56PM -0400, Chris Mason wrote:

Btrfs defaults                  57.41 MB/s
Btrfs dup no csum               74.59 MB/s 

With duplications checksums seem to be quite costly (CPU bound?)

Btrfs no duplication            76.83 MB/s
Btrfs no dup no csum no inline  76.85 MB/s

But without duplication they are basically free here at least
in IO rate. Seems odd?

Does it compute them twice in the duplication case perhaps?

-Andi