On Thu, 2020-12-03 at 12:01 +0100, Stefan Kooman wrote: > Hi, > > We have a cephfs linux kernel (5.4.0-53-generic) workload (rsync) that > seems to be limited by a single ceph-msgr thread (doing close to 100% > cpu). We would like to investigate what this thread is so busy with. > What would be the easiest way to do this? On a related note: what would > be the best way to scale cephfs client performance for a single process > (if at all possible)? > > Thanks for any pointers. > Usually kernel profiling (a'la perf) is the way to go about this. You may want to consider trying more recent kernels and see if they fare any better. With a new enough MDS and kernel, you can try enabling async creates as well, and see whether that helps performance any. As far as optimizing for a single process, there's not a lot you can do, really. -- Jeff Layton <jlayton@xxxxxxxxxx>
