I have been experiencing identical issues since around mid-January or so (though my latency sometimes reaches 3000/4000+ ms during these times). I am running a freshly installed and fully updated version of Ubuntu 18.04 Desktop. For the first couple of months after installing 18.04 I had none of these issues whatsoever, they seemed to materialize during a period when I was doing a lot of heavy software development which used a great deal of system resources (multiple VMs). Originally the workstation was wired directly to my router, but even after purchasing a wireless USB adapter I am still experiencing the issue.
I typically use remote viewing software to work on the affected workstation (from another laptop in my home), and once I begin to notice moderate sluggishness in the response time of the system I can typically run "sudo systemctl restart network-manager" and I will usually not begin to experience the issue again until several hours later, typically. If I go too long without running that command the full 10-15 minute period of extreme latency will set in. It doesn't return fully to "normal" response times after that high period, but it is far lower than the most extreme patches. I hesitate to say that the issue is similar to other bug reports because of the "dropping of the connection" aspects of those. The connection never fully dies in this case, but just experiences periods of latency related unusability. Any logs or further info available upon request. -- 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/1804280 Title: intermittent periods of packet loss and high latency Status in linux package in Ubuntu: Confirmed Status in network-manager package in Ubuntu: Confirmed Bug description: Intermittently and unpredictably, ping response times and packet loss will spike to unusable levels. Normal ping times are about .25 ms for other hosts on the local network, with essentially no packet loss. During the problematic periods (usually lasting 2-10 minutes), packet loss jumps to about 50% and ping response times on the packets that aren't dropped jump to between 250 and 750 ms. This behavior started when I upgraded from Kubuntu 16.04 to Kubuntu 18.04. Changing which host on the network I test this with has no effect (and during this, those other hosts are able to use the network without any problem). Replacing the cable changes nothing. Using a different Ethernet interface changes nothing. Replacing the switch changes nothing. This is almost certainly not a hardware problem. There is a chance that using wireless instead of Ethernet would fix the issue, but I have been avoiding that since the wired connection is much faster when Kubuntu is not malfunctioning. ProblemType: Bug DistroRelease: Ubuntu 18.04 Package: network-manager 1.10.6-2ubuntu1.1 ProcVersionSignature: Ubuntu 4.15.0-39.42-generic 4.15.18 Uname: Linux 4.15.0-39-generic x86_64 ApportVersion: 2.20.9-0ubuntu7.5 Architecture: amd64 CurrentDesktop: KDE Date: Tue Nov 20 12:48:05 2018 IfupdownConfig: # interfaces(5) file used by ifup(8) and ifdown(8) auto lo iface lo inet loopback InstallationDate: Installed on 2016-12-09 (711 days ago) InstallationMedia: Kubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1) IpRoute: default via [removed] dev enp0s31f6 proto dhcp metric 100 169.254.0.0/16 dev enp0s31f6 scope link metric 1000 [removed]/24 dev enp0s31f6 proto kernel scope link src [removed] metric 100 NetworkManager.state: [main] NetworkingEnabled=true WirelessEnabled=true WWANEnabled=true SourcePackage: network-manager UpgradeStatus: Upgraded to bionic on 2018-08-19 (92 days ago) nmcli-dev: DEVICE TYPE STATE DBUS-PATH CONNECTION CON-UUID CON-PATH enp0s31f6 ethernet connected /org/freedesktop/NetworkManager/Devices/2 Wired connection 1 2e0d0ce3-8ee2-3c06-815d-eb9a42873b3b /org/freedesktop/NetworkManager/ActiveConnection/5 [removed] bt disconnected /org/freedesktop/NetworkManager/Devices/5 -- -- -- wlp3s0 wifi disconnected /org/freedesktop/NetworkManager/Devices/4 -- -- -- lo loopback unmanaged /org/freedesktop/NetworkManager/Devices/1 -- -- -- nmcli-nm: RUNNING VERSION STATE STARTUP CONNECTIVITY NETWORKING WIFI-HW WIFI WWAN-HW WWAN running 1.10.6 connected started full enabled enabled enabled enabled enabled --- ProblemType: Bug ApportVersion: 2.20.9-0ubuntu7.5 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: dan 2053 F.... pulseaudio /dev/snd/pcmC1D0c: dan 2053 F...m pulseaudio /dev/snd/controlC1: dan 2053 F.... pulseaudio CurrentDesktop: KDE DistroRelease: Ubuntu 18.04 HibernationDevice: RESUME=UUID=4eadd7fe-e046-471d-b0ee-f1c85365411e IfupdownConfig: # interfaces(5) file used by ifup(8) and ifdown(8) auto lo iface lo inet loopback InstallationDate: Installed on 2016-12-09 (712 days ago) InstallationMedia: Kubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1) IpRoute: default via 192.168.4.1 dev enp0s31f6 proto dhcp metric 100 169.254.0.0/16 dev enp0s31f6 scope link metric 1000 192.168.4.0/24 dev enp0s31f6 proto kernel scope link src 192.168.4.42 metric 100 MachineType: Dell Inc. Precision Tower 3420 NetworkManager.state: [main] NetworkingEnabled=true WirelessEnabled=true WWANEnabled=true Package: network-manager 1.10.6-2ubuntu1.1 PackageArchitecture: amd64 ProcFB: 0 inteldrmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-39-generic root=UUID=89b1b98c-8c19-4200-966b-190a0ca44440 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 1.173.2 Tags: bionic Uname: Linux 4.15.0-39-generic x86_64 UpgradeStatus: Upgraded to bionic on 2018-08-19 (93 days ago) UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo vboxusers _MarkForUpload: True dmi.bios.date: 08/17/2018 dmi.bios.vendor: Dell Inc. dmi.bios.version: 2.11.1 dmi.board.name: 08K0X7 dmi.board.vendor: Dell Inc. dmi.board.version: A00 dmi.chassis.type: 3 dmi.chassis.vendor: Dell Inc. dmi.modalias: dmi:bvnDellInc.:bvr2.11.1:bd08/17/2018:svnDellInc.:pnPrecisionTower3420:pvr:rvnDellInc.:rn08K0X7:rvrA00:cvnDellInc.:ct3:cvr: dmi.product.family: Precision dmi.product.name: Precision Tower 3420 dmi.sys.vendor: Dell Inc. nmcli-dev: DEVICE TYPE STATE DBUS-PATH CONNECTION CON-UUID CON-PATH enp0s31f6 ethernet connected /org/freedesktop/NetworkManager/Devices/2 Wired connection 1 2e0d0ce3-8ee2-3c06-815d-eb9a42873b3b /org/freedesktop/NetworkManager/ActiveConnection/5 B0:48:1A:D8:81:FB bt disconnected /org/freedesktop/NetworkManager/Devices/5 -- -- -- wlp3s0 wifi disconnected /org/freedesktop/NetworkManager/Devices/4 -- -- -- lo loopback unmanaged /org/freedesktop/NetworkManager/Devices/1 -- -- -- nmcli-nm: RUNNING VERSION STATE STARTUP CONNECTIVITY NETWORKING WIFI-HW WIFI WWAN-HW WWAN running 1.10.6 connected started full enabled enabled enabled enabled enabled To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1804280/+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
