I use a mangle postrouting table to set priority from DSCP and put marks on the packets depending on 8 priorities.
In a queue tree per interface I shape the traffic selected on packet marks.
However, at that point some of the traffic is unmarked.
How can this be explained? A guess is that e.g. outgoing traffic from the DNS resolver to the external DNS server
is unmarked, i.e. it has not been processed by the mangle postrouting table. But there could be more.
How can this be explained? Fastpath and fasttrack are both disabled.