Public bug reported: 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. ** Affects: ubuntu Importance: Undecided Status: New ** Tags: amd64 apport-bug bionic uec-images ** Description changed: 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 compatibilities issue as we see + 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 + 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 + 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) + 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. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1862044 Title: packet loss, extra latency and lower bandwidth on bionic To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+bug/1862044/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs