On Wed, May 10, 2017 at 6:10 PM, Mark Nelson <mnelson@xxxxxxxxxx> wrote: > 1) 7 - tp_librbd, line 82 > > Lots of stuff going on here, but the big thing is all the time spent in > librbd::ImageCtx::write_to_cache. 70.2% of the total time in this thread is > spent in ObjectCacher::writex with lots of nested stuff, but if you look all > the way down on line 1293, another 11.8% of the time is spent in Locker() > and 1.5% of the time spent in ~Locker(). Yes -- the ObjectCacher is long overdue for a re-write since it's single threaded. It looks like you were essentially performing writethrough as well. I'd imagine you would just be better off disabling the rbd cache when doing high-performance random write workloads since you are going to get zero benefit from the cache with that workload -- at least that's what I usually recommend. -- To unsubscribe from this list: send the line "unsubscribe ceph-devel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
