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When I configured cpu affinity on a ubuntu 16.04 with kernel version
"4.4.0-36-generic" on a host containing 3 cpus:
on /etc/default/grub:
GRUB_CMDLINE_LINUX_DEFAULT="isolcpus=0"
update-grub
reboot
The output of "cat /proc/self/status" :
ubuntu@ubuntu:~$ cat /proc/self/status
.
.
.
Cpus_allowed: 6
Cpus_allowed_list: 1-2
Mems_allowed: 00000000,00000001
Mems_allowed_list: 0
voluntary_ctxt_switches: 0
nonvoluntary_ctxt_switches: 1
When I create an lxd container in this host using these commands:
lxc launch ubuntu:14.04 my-ubuntu
And access to this container using:
lxc exec my-ubuntu -- /bin/bash
The output of "cat /proc/self/status" :
.
.
.
Cpus_allowed: 7
Cpus_allowed_list: 0-2
Mems_allowed: 00000000,00000001
Mems_allowed_list: 0
voluntary_ctxt_switches: 0
nonvoluntary_ctxt_switches: 4
Result: Container's process doesn't take same configuration as host's process.
Host process use 2 cpus: Cpus_allowed_list: 1-2
Container process use 3 cpus: Cpus_allowed_list: 0-2
ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: linux-image-4.4.0-36-generic 4.4.0-36.55
ProcVersionSignature: Ubuntu 4.4.0-36.55-generic 4.4.16
Uname: Linux 4.4.0-36-generic x86_64
AlsaVersion: Advanced Linux Sound Architecture Driver Version k4.4.0-36-generic.
AplayDevices: Error: [Errno 2] No such file or directory: 'aplay'
ApportVersion: 2.20.1-0ubuntu2
Architecture: amd64
ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord'
AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/by-path',
'/dev/snd/hwC0D0', '/dev/snd/pcmC0D0c', '/dev/snd/pcmC0D0p',
'/dev/snd/controlC0', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1:
Card0.Amixer.info: Error: [Errno 2] No such file or directory: 'amixer'
Card0.Amixer.values: Error: [Errno 2] No such file or directory: 'amixer'
Date: Tue Sep 13 18:36:29 2016
HibernationDevice: RESUME=/dev/mapper/ubuntu--vg-swap_1
InstallationDate: Installed on 2016-08-04 (40 days ago)
InstallationMedia: Ubuntu-Server 16.04 LTS "Xenial Xerus" - Release amd64
(20160420.3)
IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig'
Lsusb:
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
MachineType: QEMU Standard PC (i440FX + PIIX, 1996)
ProcEnviron:
TERM=xterm-256color
PATH=(custom, no user)
XDG_RUNTIME_DIR=<set>
LANG=en_US.UTF-8
SHELL=/bin/bash
ProcFB: 0 qxldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.4.0-36-generic
root=/dev/mapper/username--vg-root ro isolcpus=0
RelatedPackageVersions:
linux-restricted-modules-4.4.0-36-generic N/A
linux-backports-modules-4.4.0-36-generic N/A
linux-firmware 1.157
RfKill: Error: [Errno 2] No such file or directory: 'rfkill'
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 04/01/2014
dmi.bios.vendor: SeaBIOS
dmi.bios.version: Ubuntu-1.8.2-1ubuntu1
dmi.chassis.type: 1
dmi.chassis.vendor: QEMU
dmi.chassis.version: pc-i440fx-wily
dmi.modalias:
dmi:bvnSeaBIOS:bvrUbuntu-1.8.2-1ubuntu1:bd04/01/2014:svnQEMU:pnStandardPC(i440FX+PIIX,1996):pvrpc-i440fx-wily:cvnQEMU:ct1:cvrpc-i440fx-wily:
dmi.product.name: Standard PC (i440FX + PIIX, 1996)
dmi.product.version: pc-i440fx-wily
dmi.sys.vendor: QEMU
** Affects: lxc (Ubuntu)
Importance: High
Assignee: Christian Brauner (cbrauner)
Status: Triaged
** Tags: amd64 apport-bug kernel-da-key xenial
--
Linux container does not take same cpu configuration as kernet's hosts
https://bugs.launchpad.net/bugs/1623143
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