apport information
** Attachment added: "acpidump.txt"
https://bugs.launchpad.net/bugs/1940928/+attachment/5520417/+files/acpidump.txt
** Changed in: linux (Ubuntu)
Status: Incomplete => Confirmed
--
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
