[dm-devel] [RFC PATCH 0/4] dm mpath: vastly improve blk-mq IO performance

[Johannes Thumshirn]

On 2016-03-31 22:04, Mike Snitzer wrote:
> I developed these changes some weeks ago but have since focused on
> regression and performance testing on larger NUMA systems.
> 
> For regression testing I've been using mptest:
> https://github.com/snitm/mptest
> 
> For performance testing I've been using a null_blk device (with
> various configuration permutations, e.g. pinning memory to a
> particular NUMA node, and varied number of submit_queues).
> 
> By eliminating multipath's heavy use of the m->lock spinlock in the
> fast IO paths serious performance improvements are realized.

Hi Mike,

Are this the patches you pointed Hannes to?

If yes, please add my Tested-by: Johannes Thumshirn <jthumshirn at suse.de>