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- disco' to 'verification-done-disco'. If the problem still exists, change the tag 'verification-needed-disco' to 'verification-failed-disco'.
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-disco -- 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/1832909 Title: Cache line contention prevents scaling of 100Gbps performance Status in linux package in Ubuntu: In Progress Status in linux source package in Disco: Fix Committed Status in linux source package in Eoan: In Progress Bug description: [Impact] 100Gbps network performance, as measured on an hns3 controller, doesn't scale as queue size goes up. [Test Case] Use a traffic generator instrument to generate load, using the SUT as an IP forwarder. 19.04 today: 8 queue 12 queue 16 queue 24 queue 37G 45G 38G 33G With the patch applied: 8 queue 12 queue 16 queue 24 queue 37G 50G 47G 47G [Fix] 14bd9a607f908 iommu/iova: Separate atomic variables to improve performance [Regression Risk] The patch makes no functional change, just reorders members of a structure. However, it is possible that this has unforeseen negative performance impacts on some platform. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1832909/+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
