This bug was fixed in the package apt - 1.2.29
---------------
apt (1.2.29) xenial; urgency=medium
* Set DPKG_FRONTEND_LOCKED when running {pre,post}-invoke scripts.
Some post-invoke scripts install packages, which fails because
the environment variable is not set. This sets the variable for
all three kinds of scripts {pre,post-}invoke and pre-install-pkgs,
but we will only allow post-invoke at a later time.
(LP: #1796808)
apt (1.2.28) xenial; urgency=medium
[ Julian Andres Klode ]
* apt.conf.autoremove: Add linux-cloud-tools to list (LP: #1698159)
* Add support for dpkg frontend lock (Closes: #869546) (LP: #1781169)
* Set DPKG_FRONTEND_LOCKED as needed when doing selection changes
* http: Stop pipeline after close only if it was not filled before
(LP: #1794957)
* pkgCacheFile: Only unlock in destructor if locked before (LP: #1794053)
* Update libapt-pkg5.0 symbols for frontend locking
[ David Kalnischkies ]
* Support records larger than 32kb in 'apt show' (Closes: #905527)
(LP: #1787120)
-- Julian Andres Klode <[email protected]> Tue, 09 Oct 2018 12:35:03
+0200
** Changed in: apt (Ubuntu Xenial)
Status: Fix Committed => Fix Released
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https://bugs.launchpad.net/bugs/1794957
Title:
pipelining on archive.u.c aborts after 101 packages
Status in apt package in Ubuntu:
Fix Released
Status in apt source package in Xenial:
Fix Released
Status in apt source package in Bionic:
Fix Released
Bug description:
[Impact]
Downloading many packages on archive.ubuntu.com or some other mirrors seems
to close the connection after every 100 or so packages. APT prior to 1.7.0~rc1
(commit df696650b7a8c58bbd92e0e1619e956f21010a96), treats a connection closure
with a 200 response as meaning that the server does not support pipelining,
hence disabling it for any further downloads.
With high speed connections at higher latency, this can cause a severe
reduction in usable bandwidth. For example, I saw speeds drop from 40
MB/s to 15 MB/s due to this.
The fix ensures that we continue pipelining if the previous connection
to the server successfully retrieved at least 3 files with pipelining
enabled.
[Test case]
Pick a package that would cause a large number (200/300 packages of packages
to be installed). I used plasma-desktop and xubuntu-desktop, for example. Run
apt install -d $package. Ensure that after the first 101 packages the progress
does not slow down - you should not see a lot "working" in the progress output.
The speed should be substantially higher.
Don't run in a container setup by cloud-init, as cloud-init disables
pipelining; or remove /etc/apt/apt.conf.d/90cloud-init-pipelining (see
bug 1794982).
Requirements:
* High speed, medium-high latency connection (e.g. 400 Mbit/s at 30 ms RTT is
enough); or just increase latency, e.g.
sudo tc qdisc add dev wlp61s0 root netem delay 300ms
until you see the slow down
* Not a terribly slow CPU, as we'd get slowed down by hashing otherwise
[Regression potential]
This fix is isolated to code enabling/disabling pipelining on subsequent
connections. It could cause more pipelining to be tried on servers who are not
particularly good at it, but can deal with 3 items correctly.
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/apt/+bug/1794957/+subscriptions
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