Hi. On Wed, Oct 17, 2018 at 01:41:56PM +0200, Jens Holzkämper wrote: > Hi, > > we have a NAS system acting as a place to store our server's backups > (via rsync with link-dest). On that NAS we switched from the stable > kernel (4.9) to the one provided by backports (4.18) because of an > unrelated problem. When we do that, we see a slowdown of our backup > process, from the backup via rsync itself to deleting old backup > directories. The slowdown seems to be connected to the number of > files/directories as backups of systems with less files seem less > affected than the ones with many files.
I'd complete your tests with an invocation of 'perf record/perf top' on NFS server side. The reason being - you'll be able to point out at particular kernel/userspace functions that are responsible for this slowdown. Reco
