apport information ** Attachment added: "ProcCpuinfo.txt" https://bugs.launchpad.net/bugs/1940928/+attachment/5520411/+files/ProcCpuinfo.txt
-- 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/1940928 Title: Inconsistent behavior in NIC RSS queue loading Status in linux package in Ubuntu: Confirmed Bug description: Utilizing kvms with ubuntu we face this inconsistent issue where an instance only uses a single rx queue (4 vCPUs): ethtool -S ens7 | egrep 'rx-.\.|rx_discards: ' rx_discards: 0 rx-0.packets: 2653705823 rx-0.bytes: 561319217396 rx-1.packets: 0 rx-1.bytes: 0 rx-2.packets: 0 rx-2.bytes: 0 rx-3.packets: 0 rx-3.bytes: 0 building another identical instances however sometimes works on all 4 (4 vCPUs): ethtool -S ens6 | egrep 'rx-.\.|rx_discards: ' rx_discards: 0 rx-0.packets: 234661700 rx-0.bytes: 49678565503 rx-1.packets: 231886603 rx-1.bytes: 49022714157 rx-2.packets: 232424910 rx-2.bytes: 49313057910 rx-3.packets: 235776722 rx-3.bytes: 49863841179 Applying the following workaround to the non-working instance: ethtool -L ens7 combined 2 ethtool -L ens7 combined 4 makes all RSS queues work properly (4). This looks like a race condition during boot or a kernel bug. The kernel used during the tests is: 5.4.0-81-generic #91-Ubuntu SMP Thu Jul 15 19:09:17 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux --- ProblemType: Bug AlsaDevices: total 0 crw-rw---- 1 root audio 116, 1 Aug 24 13:23 seq crw-rw---- 1 root audio 116, 33 Aug 24 13:23 timer AplayDevices: Error: [Errno 2] No such file or directory: 'aplay' ApportVersion: 2.20.11-0ubuntu27.18 Architecture: amd64 ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord' AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1: CRDA: N/A CasperMD5CheckResult: skip DistroRelease: Ubuntu 20.04 IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig' Lsusb: Bus 001 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Lsusb-t: /: Bus 01.Port 1: Dev 1, Class=root_hub, Driver=uhci_hcd/2p, 12M MachineType: OpenStack Foundation OpenStack Nova Package: linux (not installed) PciMultimedia: ProcEnviron: TERM=vt220 PATH=(custom, no user) LANG=C.UTF-8 SHELL=/bin/bash ProcFB: ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.4.0-81-generic root=UUID=c77fa46f-24bd-4fdb-8dd9-a1d1a98b3ecf ro console=tty1 console=ttyS0 ProcVersionSignature: Ubuntu 5.4.0-81.91-generic 5.4.128 RelatedPackageVersions: linux-restricted-modules-5.4.0-81-generic N/A linux-backports-modules-5.4.0-81-generic N/A linux-firmware N/A RfKill: Error: [Errno 2] No such file or directory: 'rfkill' Tags: focal uec-images Uname: Linux 5.4.0-81-generic x86_64 UpgradeStatus: No upgrade log present (probably fresh install) UserGroups: N/A _MarkForUpload: True dmi.bios.date: 04/01/2014 dmi.bios.vendor: SeaBIOS dmi.bios.version: 1.10.2-1ubuntu1 dmi.chassis.type: 1 dmi.chassis.vendor: QEMU dmi.chassis.version: pc-i440fx-4.2 dmi.modalias: dmi:bvnSeaBIOS:bvr1.10.2-1ubuntu1:bd04/01/2014:svnOpenStackFoundation:pnOpenStackNova:pvr21.2.0:cvnQEMU:ct1:cvrpc-i440fx-4.2: dmi.product.family: Virtual Machine dmi.product.name: OpenStack Nova dmi.product.version: 21.2.0 dmi.sys.vendor: OpenStack Foundation To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1940928/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : [email protected] Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
