I tried what you suggested. Ethtool reported no changes in configuration when I turned off receive offload. It reported substantial changes when I turned off transmit offload. After turning off transmit offload, transmit rate dropped from 930 Mb/s to abut 660 Mb/s, although I did not see a big CPU hit. Receive speeds were not affected by turning off receive offload.
gene-pc:~$ sudo ethtool --offload eth0 rx off gene-pc:~$ sudo ethtool --offload eth0 tx off Actual changes: tx-checksumming: off tx-checksum-ipv4: off tx-checksum-ipv6: off tcp-segmentation-offload: off tx-tcp-segmentation: off [requested on] tx-tcp6-segmentation: off [requested on] gene-pc:~$ Unfortunately, after doing this, I have had great difficulty reproducing the crash, and I do not know why. Here's what changed: I did a routine apt update, but I did not get a new kernel. I installed ethtool, and did the command you suggested. After doing that, the system refused to crash either transmit or receive. So I rebooted, this time did not run ethtool, and the system again refused to crash. Previously I could reproduce the crash in about 30 seconds. Now I cannot reproduce the crash after over an hour. An hour of transmit, and an hour of receive. And an hour bidirectional. I do not know why. One problem here is that I test at home and at work, with the same computer, but with a different TB-10 dock, monitor, keyboard, mouse. Previous to my bug report, I had never seen the problem at home. The bug report I sent was from work. Since receiving your request for information, I cannot readily reproduce the problem either at home or at work. Except once. I did see a crash at home when *I unplugged/plugged in a keyboard while the test was going on*. I have attached three lsusb outputs: - usb.work βAt work, system healthy. - usb.home β At home, system healthy. - usb.failed β At home, after the crash where I moved the keyboard What else can I do to help diagnose the problem? On Thu, Feb 14, 2019 at 11:05 PM Anthony Wong <anthony.w...@ubuntu.com> wrote: > ** Changed in: linux (Ubuntu) > Status: Confirmed => Incomplete > > -- > You received this bug notification because you are subscribed to the bug > report. > https://bugs.launchpad.net/bugs/1815808 > > Title: > Thunderbolt Ethernet high-traffic exception > > Status in linux package in Ubuntu: > Incomplete > > Bug description: > Running iperf3 on Dell XP-15 with TB-10 Thunderbolt dock causes a > kernel exception and ethernet failure after about 30 seconds. > > Easy to reproduce. Connect to another machine via Gig-E and run > iperf3 in either direction until the problem occurs. Should run 900+ > Mb in either direction. On one occasion I also lost the USB ports. > However the display continues to work. > > <on my-machine> > # uname -a > Linux hauser 4.15.0-45-generic #48-Ubuntu SMP Tue Jan 29 16:28:13 UTC > 2019 x86_64 x86_64 x86_64 GNU/Linux > # apt install iperf3 > # iperf3 -s > > <other machine> > # apt install iperf3 > # iperf3 -c my-machine -t 1000 # send to my machine > # iperf3 -c my-machine -t 1000 -R # receive data from my machine > > When the bitrate drops to zero, look in syslog for the exception. > > Note: Until recently the TB-10 Ethernet would not receive full speed. > (prior to -43 kernel) Did not see this problem before the Ethernet > performance increased. > > ProblemType: Bug > DistroRelease: Ubuntu 18.04 > Package: linux-image-4.15.0-45-generic 4.15.0-45.48 > ProcVersionSignature: Ubuntu 4.15.0-45.48-generic 4.15.18 > Uname: Linux 4.15.0-45-generic x86_64 > NonfreeKernelModules: nvidia_modeset nvidia > ApportVersion: 2.20.9-0ubuntu7.5 > Architecture: amd64 > AudioDevicesInUse: > USER PID ACCESS COMMAND > /dev/snd/controlC0: gene 1994 F.... pulseaudio > CurrentDesktop: ubuntu:GNOME > Date: Wed Feb 13 13:54:28 2019 > HibernationDevice: RESUME=UUID=d15ecb23-8691-42a1-9909-a56f934b536c > InstallationDate: Installed on 2018-11-19 (86 days ago) > InstallationMedia: Ubuntu 18.04.1 LTS "Bionic Beaver" - Release amd64 > (20180725) > MachineType: Dell Inc. XPS 15 9570 > ProcFB: 0 inteldrmfb > ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-45-generic > root=UUID=a73e2d3e-5ce3-4130-917d-d116c1316153 ro net.ifnames=0 > mem_sleep_default=deep > RelatedPackageVersions: > linux-restricted-modules-4.15.0-45-generic N/A > linux-backports-modules-4.15.0-45-generic N/A > linux-firmware 1.173.3 > SourcePackage: linux > UpgradeStatus: No upgrade log present (probably fresh install) > dmi.bios.date: 12/25/2018 > dmi.bios.vendor: Dell Inc. > dmi.bios.version: 1.7.0 > dmi.board.name: 02MJVY > dmi.board.vendor: Dell Inc. > dmi.board.version: A00 > dmi.chassis.type: 10 > dmi.chassis.vendor: Dell Inc. > dmi.modalias: > dmi:bvnDellInc.:bvr1.7.0:bd12/25/2018:svnDellInc.:pnXPS159570:pvr:rvnDellInc.:rn02MJVY:rvrA00:cvnDellInc.:ct10:cvr: > dmi.product.family: XPS > dmi.product.name: XPS 15 9570 > dmi.sys.vendor: Dell Inc. > > To manage notifications about this bug go to: > https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1815808/+subscriptions > ** Attachment added: "usb.failed" https://bugs.launchpad.net/bugs/1815808/+attachment/5239162/+files/usb.failed ** Attachment added: "usb.home" https://bugs.launchpad.net/bugs/1815808/+attachment/5239163/+files/usb.home ** Attachment added: "usb.work" https://bugs.launchpad.net/bugs/1815808/+attachment/5239164/+files/usb.work -- 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/1815808 Title: Thunderbolt Ethernet high-traffic exception Status in linux package in Ubuntu: Incomplete Bug description: Running iperf3 on Dell XP-15 with TB-10 Thunderbolt dock causes a kernel exception and ethernet failure after about 30 seconds. Easy to reproduce. Connect to another machine via Gig-E and run iperf3 in either direction until the problem occurs. Should run 900+ Mb in either direction. On one occasion I also lost the USB ports. However the display continues to work. <on my-machine> # uname -a Linux hauser 4.15.0-45-generic #48-Ubuntu SMP Tue Jan 29 16:28:13 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux # apt install iperf3 # iperf3 -s <other machine> # apt install iperf3 # iperf3 -c my-machine -t 1000 # send to my machine # iperf3 -c my-machine -t 1000 -R # receive data from my machine When the bitrate drops to zero, look in syslog for the exception. Note: Until recently the TB-10 Ethernet would not receive full speed. (prior to -43 kernel) Did not see this problem before the Ethernet performance increased. ProblemType: Bug DistroRelease: Ubuntu 18.04 Package: linux-image-4.15.0-45-generic 4.15.0-45.48 ProcVersionSignature: Ubuntu 4.15.0-45.48-generic 4.15.18 Uname: Linux 4.15.0-45-generic x86_64 NonfreeKernelModules: nvidia_modeset nvidia ApportVersion: 2.20.9-0ubuntu7.5 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: gene 1994 F.... pulseaudio CurrentDesktop: ubuntu:GNOME Date: Wed Feb 13 13:54:28 2019 HibernationDevice: RESUME=UUID=d15ecb23-8691-42a1-9909-a56f934b536c InstallationDate: Installed on 2018-11-19 (86 days ago) InstallationMedia: Ubuntu 18.04.1 LTS "Bionic Beaver" - Release amd64 (20180725) MachineType: Dell Inc. XPS 15 9570 ProcFB: 0 inteldrmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-45-generic root=UUID=a73e2d3e-5ce3-4130-917d-d116c1316153 ro net.ifnames=0 mem_sleep_default=deep RelatedPackageVersions: linux-restricted-modules-4.15.0-45-generic N/A linux-backports-modules-4.15.0-45-generic N/A linux-firmware 1.173.3 SourcePackage: linux UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 12/25/2018 dmi.bios.vendor: Dell Inc. dmi.bios.version: 1.7.0 dmi.board.name: 02MJVY dmi.board.vendor: Dell Inc. dmi.board.version: A00 dmi.chassis.type: 10 dmi.chassis.vendor: Dell Inc. dmi.modalias: dmi:bvnDellInc.:bvr1.7.0:bd12/25/2018:svnDellInc.:pnXPS159570:pvr:rvnDellInc.:rn02MJVY:rvrA00:cvnDellInc.:ct10:cvr: dmi.product.family: XPS dmi.product.name: XPS 15 9570 dmi.sys.vendor: Dell Inc. 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