This bug is awaiting verification that the kernel in -proposed solves the problem. Please test the kernel and update this bug with the results. If the problem is solved, change the tag 'verification-needed- xenial' to 'verification-done-xenial'.
If verification is not done by 5 working days from today, this fix will be dropped from the source code, and this bug will be closed. See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to enable and use -proposed. Thank you! ** Tags added: verification-needed-xenial -- 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/1623627 Title: thunder: faulty TSO padding Status in linux package in Ubuntu: In Progress Status in linux source package in Xenial: Fix Committed Bug description: [Impact] Certain packet sizes will trigger spurious TCP retransmissions on Cavium Thunder-X systems when TSO is enabled (the default). This can result in excess traffic and additional latency. [Test Case] Connect 2 systems to a 10G switch: - 1 ThunderX node (the client) - 1 "other" node - doesn't have to be ThunderX (the server) On the server, run the "receiver" command from the attached tcptest tarball: $ ./receiver Also on the server, run tcpdump to capture the traffic: $ sudo tcpdump -i <iface> -w tcpdump.out On the client, run the "sender" command from the tcptest tarball, with a 1461 packet size: $ ./sender <ip of receiver> 1461 1461 Kill the tcpdump process, and open it in wireshark. On failure, you'll see several "[TCP Spurious Retransmission]" packets - on success you should see none. [Regression Risk] Fix is upstream, so regressions will have upstream support. Fix is limited to a driver that is only applicable to the Cavium Thunder-X SoC, so risk is negligible to other platforms. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1623627/+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
