On Tue, Jun 26, 2012 at 02:19:17PM -0600, Stefan Priebe wrote:

Am 26.06.2012 22:14, schrieb Josef Bacik:

quoted

I can't reproduce so I'm going to have to figure out a way to debug it through
you, as soon as I think of something I will let you know.  Thanks,

Thanks. You mentioned that discard shouldn't have any positive effects 
on a SSD.

May i see a sideffect? I mean with discard 13.000 IOPs in ceph without 
discard just 6000-9000 IOPs could this be real or might this just happen 
due to the bug i see?

Beats me, it would seem to me that discard would make things slower since we
have to wait for the commit to discard everybody, but who knows, stranger things
have happened.  Can you reproduce 2 more times and get sysrq+w each time so I
have a few different outputs to compare, maybe I'm missing something.  Thanks,

Josef