Subject: Re: Time in Queue, bufferbloat, and... our accidentally interplanetary network

From: Hagen Paul Pfeifer <hagen-GvnIQ6b/[email-masked]>
Date: Wed, 07 Dec 2011 11:15:38 +0100

On Mon, 05 Dec 2011 11:59:34 +0100, Eric Dumazet wrote:

> Adding a time limit is possible, all we need is a proper design and
> implementation :)
> 
> Here is my suggestion :
> 
> Design a new tfifo/tred qdisc, with following properties :
> 
> Adaptative RED, (ECN enabled + head drop), but instead of using
> bytes/packet qlen average, use time_in_queue average.

Question one: is anything wrong with sfb or choke as the basis, instead of
RED?

Question two: I submitted pfast_head_drop to drop more outdated data
instead of new data. Back in time I thought TCP _may_ experience benefits
because more up-to-date SACK data packets are saved. Are there any other
TCP advantages with head drop policy?

Hagen