[tcpm] Better QoS for TCP ACK question

[Toerless Eckert <[e-mail]>]

A couple of years ago i was told that a range of home routers
would do some DPI based diffserv QoS, aka prioritizing TCP ACP
messages in the queue before any other packets 9sonded like
a strict priority queue for these packets). The goal was to
improve performance when you had separate up and downstream TCP
connections, especially when the upstream TCP connection delayed
the downstream TCP connections ACKs.

I never could find a lot of good details about this, e.g.: quantitiative
measurements, so i was wondering if others here on the list
are aware of it. Of course, if something like this would
be significantly useful even in the face of current TCP congestion
control mechanisms (and not only bad older ones).

Cheers
    Toerless