This bug is missing log files that will aid in diagnosing the problem.
While running an Ubuntu kernel (not a mainline or third-party kernel)
please enter the following command in a terminal window:
apport-collect 1916869
and then change the status of the bug to 'Confirmed'.
If, due to the nature of the issue you have encountered, you are unable
to run this command, please add a comment stating that fact and change
the bug status to 'Confirmed'.
This change has been made by an automated script, maintained by the
Ubuntu Kernel Team.
** Changed in: linux (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1916869
Title:
linux-image-kvm package missing key network qdisc/TCP CC modules
Status in linux package in Ubuntu:
Incomplete
Bug description:
At present the Ubuntu 20.04 linux-image-kvm kernel package don't
include the tcp_bbr, sch_cake and sch_fq_codel kernel modules. The
latter has been default on desktop for a number of release cycles;
cake improves on this.
These queueing disciplines are instrumental to reducing queueing
latency [bufferbloat.net]; the TCP congestion control algo elevates
bandwidth on lossy paths (think clients on radio networks).
Enabling these kernel modules will ensure Ubuntu has an optimally
competitive network stack in cloud/VM systems.
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