I also encountered network performance degradation on my server, however I'm not running Ubuntu but Debian with a self-compiled kernel. With bisecting the kernel, I could track this issue down to this commit between 4.14.2 and 4.14.3: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=0f478f25d50cb6464678284a13f514fefc16e271
I was tempted to undo this change in my kernel, however this change works around a bug in the I219 adapter and I didn't want to end up with an unstable system. Related to this bug I read about TCP segmentation offload and changed tso and gso values with ethtool. Eventually "ethtool -K enp0s31f6 tso" off did the trick for me and network performance is back to normal. You might have to change the name of enp0s31f6 to the name of your Ethernet adapter or play with on/off values for tso and gso. In order to persist this setting after a reboot, I created a udev rule that calls ethtool, maybe this option works for you as well. -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1802691 Title: Slow send speed with Intel I219-V on Ubuntu 18.04.1 Status in linux package in Ubuntu: Confirmed Bug description: Testing with iperf3 send speed is only 750mbps while receive speed is normal - 940mbps. Ubuntu 18.04.1 Msi b250m mortar --- ProblemType: Bug ApportVersion: 2.20.9-0ubuntu7.5 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: django 1016 F.... pulseaudio CurrentDesktop: ubuntu:GNOME DistroRelease: Ubuntu 18.04 InstallationDate: Installed on 2018-11-09 (6 days ago) InstallationMedia: Ubuntu 18.04.1 LTS "Bionic Beaver" - Release amd64 (20180725) IwConfig: enp0s31f6 no wireless extensions. lo no wireless extensions. Lsusb: Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub MachineType: MSI MS-7A69 Package: linux (not installed) ProcFB: 0 inteldrmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-39-generic root=UUID=991b4393-3308-4615-97c8-9854b3bdc67e ro quiet splash vt.handoff=1 ProcVersionSignature: Ubuntu 4.15.0-39.42-generic 4.15.18 RelatedPackageVersions: linux-restricted-modules-4.15.0-39-generic N/A linux-backports-modules-4.15.0-39-generic N/A linux-firmware 1.173.1 RfKill: Tags: bionic Uname: Linux 4.15.0-39-generic x86_64 UpgradeStatus: No upgrade log present (probably fresh install) UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo _MarkForUpload: True dmi.bios.date: 06/29/2018 dmi.bios.vendor: American Megatrends Inc. dmi.bios.version: A.60 dmi.board.asset.tag: Default string dmi.board.name: B250M MORTAR ARCTIC (MS-7A69) dmi.board.vendor: MSI dmi.board.version: 2.0 dmi.chassis.asset.tag: Default string dmi.chassis.type: 3 dmi.chassis.vendor: MSI dmi.chassis.version: 2.0 dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrA.60:bd06/29/2018:svnMSI:pnMS-7A69:pvr2.0:rvnMSI:rnB250MMORTARARCTIC(MS-7A69):rvr2.0:cvnMSI:ct3:cvr2.0: dmi.product.family: Default string dmi.product.name: MS-7A69 dmi.product.version: 2.0 dmi.sys.vendor: MSI To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1802691/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
