On Fri, Apr 01 2016 at 4:12am -0400, Johannes Thumshirn <jthumshirn@xxxxxxx> wrote: > 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@xxxxxxx> No they are not. Hannes seems to have last pulled in my DM mpath changes that (ab)used RCU. I ended up dropping those changes and this patchset is the replacement. So please retest with this patchset (I know you guys have a large setup that these changes are very relevant for). If you could actually share _how_ yo've tested that'd help me understand how these changes are holding up. So far all looks good for me... Mike -- To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
