Newstore Update Part 2

[Mark Nelson <mnelson@redhat.com>]

Hi Guys,

At the performance meeting this week we discussed the possibility of 
changing how newstore handles large partial overwrites.  To determine if 
this is useful, we look at rados bench and rbd performance of newstore 
at various IO sizes.  I've also included some rados bench read results 
as folks were interested in those.  On the graphs I've tried to mark 
interesting improvements/regressions and also some questions/comments. 
These tests were run without overlay which may help small IO performance 
in some cases.

Graphs are here:

http://nhm.ceph.com/newstore/8c8c5903_rbd_rados_tests.pdf

Thanks,
Mark