Comment 10 for bug 1815808

I ran the 5.0.0 kernel, sending data bidirectionally with iperf3. It
failed after about 10 minutes, I lost the Ethernet and the keyboard/mouse
connected through the TB-10 dock. Unfortunately I forgot to do an lsusb -v
in the crashed state.

After rebooting, I ran iperf3 again, bidirectionally for an hour. No
hiccups, no errors. Talking to two other machines (one transmit/one
receive) the XP 15 maintained 933 Mb/s bidirectional with no dropped
packets for the entire time. Previously total bidirectional bandwidth was
limited to about 1.3 Gb/s, with a bandwidth varying both transmit and
receive.

How else can I help?

On Wed, Feb 20, 2019 at 5:45 AM Kai-Heng Feng <email address hidden>
wrote:

> Would it be possible for you to test the latest upstream kernel? Refer
> to https://wiki.ubuntu.com/KernelMainlineBuilds . Please test the latest
> v5.0-rc7 kernel[0].
>
> If this bug is fixed in the mainline kernel, please add the following
> tag 'kernel-fixed-upstream'.
>
> If the mainline kernel does not fix this bug, please add the tag:
> 'kernel-bug-exists-upstream'.
>
> Once testing of the upstream kernel is complete, please mark this bug as
> "Confirmed".
>
>
> Thanks in advance.
>
> [0] https://kernel.ubuntu.com/~kernel-ppa/mainline/v5.0-rc7/
>
> --
> 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.
>
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>