We have a bandwidth limit between a Linux server and a NAS, created using 'tc' with an IP filter.
When writing to an NFS mount of the NAS, rsync claims a very high transfer speed for each file and then waits a long time before acknowledging that everything has finished.
The total time taken is consistent with the QoS limit and the time taken by the same transfer over FTP.
Why does the write to the NFS mount report higher transfer speeds than are actually happening over the network?
How can I monitor the actual bandwidth of the transfer?