[Touch-packages] [Bug 1794957] Re: pipelining on archive.u.c aborts after 101 packages
** Description changed: [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) * 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. -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to apt in Ubuntu. 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: Triaged Status in apt source package in Bionic: Triaged 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) * 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 -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp
[Touch-packages] [Bug 1794957] Re: pipelining on archive.u.c aborts after 101 packages
Hello Julian, or anyone else affected, Accepted apt into bionic-proposed. The package will build now and be available at https://launchpad.net/ubuntu/+source/apt/1.6.5 in a few hours, and then in the -proposed repository. Please help us by testing this new package. See https://wiki.ubuntu.com/Testing/EnableProposed for documentation on how to enable and use -proposed. Your feedback will aid us getting this update out to other Ubuntu users. If this package fixes the bug for you, please add a comment to this bug, mentioning the version of the package you tested and change the tag from verification-needed-bionic to verification-done-bionic. If it does not fix the bug for you, please add a comment stating that, and change the tag to verification-failed-bionic. In either case, without details of your testing we will not be able to proceed. Further information regarding the verification process can be found at https://wiki.ubuntu.com/QATeam/PerformingSRUVerification . Thank you in advance for helping! N.B. The updated package will be released to -updates after the bug(s) fixed by this package have been verified and the package has been in -proposed for a minimum of 7 days. ** Changed in: apt (Ubuntu Bionic) Status: Triaged => Fix Committed ** Tags added: verification-needed verification-needed-bionic -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to apt in Ubuntu. 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: Triaged Status in apt source package in Bionic: Fix Committed 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) * 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 -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp
[Touch-packages] [Bug 1794957] Re: pipelining on archive.u.c aborts after 101 packages
Hello Julian, or anyone else affected, Accepted apt into xenial-proposed. The package will build now and be available at https://launchpad.net/ubuntu/+source/apt/1.2.28 in a few hours, and then in the -proposed repository. Please help us by testing this new package. See https://wiki.ubuntu.com/Testing/EnableProposed for documentation on how to enable and use -proposed. Your feedback will aid us getting this update out to other Ubuntu users. If this package fixes the bug for you, please add a comment to this bug, mentioning the version of the package you tested and change the tag from verification-needed-xenial to verification-done-xenial. If it does not fix the bug for you, please add a comment stating that, and change the tag to verification-failed-xenial. In either case, without details of your testing we will not be able to proceed. Further information regarding the verification process can be found at https://wiki.ubuntu.com/QATeam/PerformingSRUVerification . Thank you in advance for helping! N.B. The updated package will be released to -updates after the bug(s) fixed by this package have been verified and the package has been in -proposed for a minimum of 7 days. ** Changed in: apt (Ubuntu Xenial) Status: Triaged => Fix Committed ** Tags added: verification-needed-xenial -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to apt in Ubuntu. 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 Committed Status in apt source package in Bionic: Fix Committed 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) * 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 -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp
[Touch-packages] [Bug 1794957] Re: pipelining on archive.u.c aborts after 101 packages
** Description changed: [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) + * 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. -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to apt in Ubuntu. 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 Committed Status in apt source package in Bionic: Fix Committed 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 -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp
[Touch-packages] [Bug 1794957] Re: pipelining on archive.u.c aborts after 101 packages
** Attachment added: "bionic: network bandwidth before (1.6.3ubuntu0.1)" https://bugs.launchpad.net/ubuntu/+source/apt/+bug/1794957/+attachment/5203090/+files/Screenshot%20from%202018-10-19%2015-55-47.png -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to apt in Ubuntu. 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 Committed Status in apt source package in Bionic: Fix Committed 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 -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp
[Touch-packages] [Bug 1794957] Re: pipelining on archive.u.c aborts after 101 packages
Same for xenial; 1.2.27 shows the symptoms, and the 1.2.29 SRU fixes them. Not going to attach more images or text as it basically looks identical. ** Tags removed: verification-needed verification-needed-bionic verification-needed-xenial ** Tags added: verification-done verification-done-bionic verification-done-xenial -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to apt in Ubuntu. 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 Committed Status in apt source package in Bionic: Fix Committed 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 -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp
[Touch-packages] [Bug 1794957] Re: pipelining on archive.u.c aborts after 101 packages
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 -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to apt in Ubuntu. 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 Committed Status in apt source package in Bionic: Fix Committed 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 -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp
[Touch-packages] [Bug 1794957] Re: pipelining on archive.u.c aborts after 101 packages
This bug was fixed in the package apt - 1.6.6
---
apt (1.6.6) bionic; 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 (1.6.5) bionic; urgency=medium
[ David Kalnischkies ]
* Support records larger than 32kb in 'apt show' (Closes: #905527)
(LP: #1787120)
[ Julian Andres Klode ]
* 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
-- Julian Andres Klode Tue, 09 Oct 2018 12:16:51
+0200
** Changed in: apt (Ubuntu Bionic)
Status: Fix Committed => Fix Released
--
You received this bug notification because you are a member of Ubuntu
Touch seeded packages, which is subscribed to apt in Ubuntu.
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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Post to : touch-packages@lists.launchpad.net
Unsubscribe : https://launchpad.net/~touch-packages
More help : https://help.launchpad.net/ListHelp
[Touch-packages] [Bug 1794957] Re: pipelining on archive.u.c aborts after 101 packages
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 Tue, 09 Oct 2018 12:35:03
+0200
** Changed in: apt (Ubuntu Xenial)
Status: Fix Committed => Fix Released
--
You received this bug notification because you are a member of Ubuntu
Touch seeded packages, which is subscribed to apt in Ubuntu.
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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