This second graph shows during the same run the number of packets per second this time.
YOu can see that Xenial is sending less packets per second than bionic. Also this is the output of tc -s qdisc for the second bionic node: qdisc fq_codel 0: dev enp3s0 root refcnt 2 limit 10240p flows 1024 quantum 1514 target 5.0ms interval 100.0ms memory_limit 32Mb ecn Sent 254067572631 bytes 675644785 pkt (dropped 1732, overlimits 0 requeues 627) backlog 0b 0p requeues 627 As you can see packet drop is reported, an only that test as been run this this machine as been created. this is the same output for the Xenial node: qdisc pfifo_fast 0: dev enp3s0 root refcnt 2 bands 3 priomap 1 2 2 2 1 2 0 0 1 1 1 1 1 1 1 1 Sent 326734300816 bytes 555522299 pkt (dropped 0, overlimits 0 requeues 558309) as you can see no packet drop, but we this machine exist since way longer time. ** Attachment added: "packets trhoughput" https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/1862044/+attachment/5325973/+files/packets%20throughput.png -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to systemd in Ubuntu. https://bugs.launchpad.net/bugs/1862044 Title: packet loss, extra latency and lower bandwidth on bionic Status in systemd package in Ubuntu: Incomplete Bug description: We are investigating migrating our servers from Xenial to Bionic. We are seeing significant network differences between the 2 LTS versions. Using the same hardware an machines connected to a single swith on the same network, we see: 10% less packets throuput on bionic in comparision to Xenial when running uperf. Also "tc -s qdisc" report packets been dropped on Bionic but not Xenial. The command iperf -c <host> -u -d -p 20 timeout on Bionic and not on Xenial, and if you reduce the value of p, you will see more packet drops on Bionic. We tryied to upgrade the xenial kernel to the same version than bionic. We did not see any improvement. All the tests are performed with 4 identical physical machines connected to the same physical switch. With one bionic machine, one Xenial machine and 2 extra Xenial machine that act as iperf/uperf clients. All 4 nodes are configured as ntp peers with each others. Under load, the bionic machine see siginificant jitter improvement with the 3 others machines. We don't see that with the Xenial hosts. I doesn't seems to be an hardware compatibility issue as we see significant network performance loss in our datacenter on fully different hardware. ProblemType: Bug DistroRelease: Ubuntu 18.04 Package: iperf 2.0.10+dfsg1-1ubuntu0.18.04.2 ProcVersionSignature: Ubuntu 4.15.0-76.86-lowlatency 4.15.18 Uname: Linux 4.15.0-76-lowlatency x86_64 ApportVersion: 2.20.9-0ubuntu7.9 Architecture: amd64 Date: Wed Feb 5 17:14:25 2020 Dependencies: gcc-8-base 8.3.0-6ubuntu1~18.04.1 libc6 2.27-3ubuntu1 libgcc1 1:8.3.0-6ubuntu1~18.04.1 libstdc++6 8.3.0-6ubuntu1~18.04.1 InstallationDate: Installed on 2020-01-29 (7 days ago) InstallationMedia: Ubuntu-Server 18.04.3 LTS "Bionic Beaver" - Release amd64 (20190805) ProcEnviron: TERM=xterm-256color PATH=(custom, no user) XDG_RUNTIME_DIR=<set> LANG=en_US.UTF-8 SHELL=/bin/bash SourcePackage: iperf UpgradeStatus: No upgrade log present (probably fresh install) ProblemType: Bug DistroRelease: Ubuntu 18.04 Package: systemd 237-3ubuntu10.29 ProcVersionSignature: Ubuntu 4.15.0-76.86-lowlatency 4.15.18 Uname: Linux 4.15.0-76-lowlatency x86_64 ApportVersion: 2.20.9-0ubuntu7.9 Architecture: amd64 Date: Wed Feb 5 17:29:53 2020 ExecutablePath: /lib/systemd/systemd InstallationDate: Installed on 2020-01-29 (7 days ago) InstallationMedia: Ubuntu-Server 18.04.3 LTS "Bionic Beaver" - Release amd64 (20190805) MachineType: Dell Inc. XPS 8700 ProcEnviron: TERM=linux PATH=(custom, no user) ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.15.0-76-lowlatency root=UUID=400563c9-8749-47b7-8abb-1efdb57bc589 ro SourcePackage: systemd UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 05/16/2013 dmi.bios.vendor: Dell Inc. dmi.bios.version: A01 dmi.board.name: 0KWVT8 dmi.board.vendor: Dell Inc. dmi.board.version: A00 dmi.chassis.type: 3 dmi.chassis.vendor: Dell Inc. dmi.modalias: dmi:bvnDellInc.:bvrA01:bd05/16/2013:svnDellInc.:pnXPS8700:pvr:rvnDellInc.:rn0KWVT8:rvrA00:cvnDellInc.:ct3:cvr: dmi.product.family: To be filled by O.E.M. dmi.product.name: XPS 8700 dmi.sys.vendor: Dell Inc. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/1862044/+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
