Here is a short graphical comparison of before/after in the bionic SRU
in a container. I modified the container's network bridge to add 300ms
delay using

sudo tc qdisc add dev lxdbr0 root netem delay 300ms

which made things quite more visible on a slower 12 Mbit/s connection.

I could clearly see that _without_ the 1.6.6 SRU, speed dropped a lot
after the first 100 (101?) packages were fetched, you could see in the
progress that it fetched one file and then started fetching the next
one.

In contrast, with the SRU installed, progress sometimes shows lines with
multiple files very quickly; i.e. it drains the entire pipe of 10 items
in what feels like one update of the progress output.

You can also see this in the pictures: In the old graph, network speed
has a sudden drop in the middle; in the second picture (which was
running a bit longer, so it starts more on the left), you see that
performance can be sustained.

** Attachment added: "bionic: network bandwidth after (1.6.6)"
   
https://bugs.launchpad.net/ubuntu/+source/apt/+bug/1794957/+attachment/5203091/+files/Screenshot%20from%202018-10-19%2015-57-57.png

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https://bugs.launchpad.net/bugs/1794957

Title:
  pipelining on archive.u.c aborts after 101 packages

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