On Sun, Feb 07 2016 at 11:54am -0500, Sagi Grimberg <sagig@xxxxxxxxxxxxxxxxxx> wrote: > > >>If so, can you check with e.g. > >>perf record -ags -e LLC-load-misses sleep 10 && perf report whether this > >>workload triggers perhaps lock contention ? What you need to look for in > >>the perf output is whether any functions occupy more than 10% CPU time. > > > >I will, thanks for the tip! > > The perf report is very similar to the one that started this effort.. > > I'm afraid we'll need to resolve the per-target m->lock in order > to scale with NUMA... Could be. Just for testing, you can try the 2 topmost commits I've put here (once applied both __multipath_map and multipath_busy won't have _any_ locking.. again, very much test-only): http://git.kernel.org/cgit/linux/kernel/git/snitzer/linux.git/log/?h=devel2 -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
