Tootfinder

I looked at #Ceph code today, #AMA.
( https://github.com/ceph/ceph )

GitHub - ceph/ceph: Ceph is a distributed object, block, and file storage platform
Ceph is a distributed object, block, and file storage platform - ceph/ceph

Well this was not expected.
The 100G optics I ordered for my desk came in, and swapping the pipe to my desk from 40 to 100G gave a huge improvement in Ceph performance.
But I don't understand *why*.
Baseline config from earlier in the year: client on 40G, cluster nodes on dual 10G, 1558 MB/s on linear reads
Moving cluster nodes to 40G, client on 40G: 1864 MB/s
Moving client to 100G, cluster nodes on 40G: 3787 MB/s.
The confusing thing is, even 3787 MB/…