I'm still trying to confirm this for 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/1820948
Title: i40e xps management broken when > 64 queues/cpus Status in linux package in Ubuntu: In Progress Status in linux source package in Bionic: Fix Committed Bug description: [Impact] Transmit packet steering (xps) settings don't work when the number of queues (cpus) is higher than 64. This is currently still an issue on the 4.15 kernel (Xenial -hwe and Bionic kernels). It was fixed in Intel's i40e driver version 2.7.11 and in 4.16-rc1 mainline Linux (i.e. Cosmic, Disco have fix). Fix ----- The following commit fixes this issue (as identified by Lihong Yang in discussion with Intel i40e team): "i40e: Fix the number of queues available to be mapped for use" Commit: bc6d33c8d93f5999920e97a8c6330b8910053d4f It requires the following commit as well: i40e: Do not allow use more TC queue pairs than MSI-X vectors exist Commit: 1563f2d2e01242f05dd523ffd56fe104bc1afd58 [Test Case] 1. Kernel version: Bionic/Xenial -hwe: any 4.15 kernel i40e driver version: 2.1.14-k Any system with > 64 CPUs 2. For any queue 0 - 63, you can read/set tx xps: echo ffffffff > /sys/class/net/eth2/queues/tx-63/xps_cpus echo $? 0 cat /sys/class/net/eth2/queues/tx-63/xps_cpus 00,00000000,ffffffff But for any queue number > 63, we see this error: echo ffffffff > /sys/class/net/eth2/queues/tx-64/xps_cpus echo: write error: Invalid argument cat /sys/class/net/eth2/queues/tx-64/xps_cpus cat: /sys/class/net/eth2/queues/tx-64/xps_cpus: Invalid argument To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1820948/+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
