hello, i observe a weird performance problem while trying to rsync .vhd image files from xenserver to linux backupserver. i have broken the problem down to a single 500gb file which gets pathological slow on subsequent runs. rsync begins with decent speed (250MB/s), i can see that with --progress and also verify with iotop. After a while, rsync performance drops down to <3MB/s where i see cpu at 100% on the sender side. I'm using rsync in daemon mode, receiver is 3.1.2 and sender is 3.1.1. No encryption or compression in place. What is causing this slowness? I know about https://www.anchor.com.au/blog/2013/08/out-tridging-tridge/, but according to that article, the problem should have been adressed. Is there still possibility for "pathological slow performance" which lies in algorithm/design? (as it does not look like a server/system performance for me) regards Roland