On Wed, Feb 10 2016 at 8:50pm -0500, Mike Snitzer <snitzer@xxxxxxxxxx> wrote: > On Tue, Feb 09 2016 at 7:45pm -0500, > Mike Snitzer <snitzer@xxxxxxxxxx> wrote: > > > > > OK, I took a crack at embracing RCU. Only slightly better performance > > on my single NUMA node testbed. (But I'll have to track down a system > > with multiple NUMA nodes to do any justice to the next wave of this > > optimization effort) > > > > This RCU work is very heavy-handed and way too fiddley (there could > > easily be bugs). Anyway, please see: > > http://git.kernel.org/cgit/linux/kernel/git/snitzer/linux.git/commit/?h=devel2&id=d80a7e4f8b5be9c81e4d452137623b003fa64745 > > > > But this might give you something to build on to arrive at something > > more scalable? > > I've a bit more polished version of this work (broken up into multiple > commits, with some fixes, etc) here: > http://git.kernel.org/cgit/linux/kernel/git/snitzer/linux.git/log/?h=devel3 > > Hannes and/or Sagi, if you get a chance to try this on your NUMA system > please let me know how it goes. FYI, with these changes my single NUMA node testbed's read IOPs went from: ~1310K to ~1410K w/ nr_hw_queues dm-mq=4 and null_blk=4 ~1330K to ~1415K w/ nr_hw_queues dm-mq=4 and null_blk=12 ~1365K to ~1425K w/ nr_hw_queues dm-mq=12 and null_blk=12 -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
