** Also affects: linux-azure (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1881787
Title:
High rate of packet loss upgrading to kernel 5.3 and later.
Status in linux-azure package in Ubuntu:
New
Status in linux-meta-azure-5.3 package in Ubuntu:
New
Bug description:
Performing testing on Ubuntu 18.04 LTS and Ubuntu 20.04 LTS.
Setup:
ocserv built from https://gitlab.com/openconnect/ocserv.git @
59bdd070b6b9f893d3f552b6a8895a5f4eb014da, running in Docker container built
from Ubuntu 18.04 Docker image.
Test:
1000 clients connected using openconnect
(https://gitlab.com/openconnect/openconnect) (clients spread across 54 VMs,
each client running in a Docker container for network isolation)
Simulating 3 workloads:
1) IM traffic - (TCP, with server echoing the stream and client sending
[1,1024] bytes every [2500,7500]ms)
2) Audio streaming - (UDP, with server sending 128kbps, sending packets 60
times per second)
3) web-browser - (Loading of 3mb web-page, with 11 elements requiring
separate HTTP gets, reloading every 60 seconds.)
Results:
Ubuntu 18.04 / Linux kernel version 4.15.0-101-generic
(buildd@lgw01-amd64-003)) - less than 1% packet loss.
Ubuntu 18.04 / Linux kernel version 5.3.0-1022-azure
(buildd@lcy01-amd64-001)) - 9% packet loss.
Ubuntu 20.04 / Linux kernel version 5.4.0-33 - 9% packet loss.
Tested on both 18.04 and 20.04 VM running on Hyper-V and on a bare-
metal install of Ubuntu 20.04 LTS.
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