** Changed in: linux (Ubuntu Xenial)
Status: In Progress => Fix Committed
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
thunder: faulty TSO padding
Status in linux package in Ubuntu:
Status in linux source package in Xenial:
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.
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:
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
$ ./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.
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:
Mailing list: https://launchpad.net/~kernel-packages
Post to : firstname.lastname@example.org
Unsubscribe : https://launchpad.net/~kernel-packages
More help : https://help.launchpad.net/ListHelp