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** Changed in: linux (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1905993
Title:
Actual kernel don't want to make more than 64 cpus available
Status in linux package in Ubuntu:
Incomplete
Bug description:
This is kinda complicated but i try my best to explain it as much as i
can.
First of all i found out that in bionic beaver cloud image i was able to have
248 cpus without any issues.
Then i've taken a look into focal, but there i was only able to get up up to
64 cpus.
Then i've tryed to figure out what was wrong. Debian, wasnt able to handle
this with a 4.19 kernel.
Bionic beaver had 4.18 so i tried to upgrade to a 4.19 with success but only
with 64 cpus.
So i think the problem maybe exist since 4.19.
My setup. Openstack Hypervisor with ubuntu 18.04
KVM/Qemu with a vm clean bionic works fine, till i upgrade to a kernel > 4.18.
Every 5.* version seems to be affected as well.
Debian buster has this issue and fedora (Both in latest versions with
kernel above 4.18)
Already started debugging with TJ- at irc.
Paste links with debugging informations
/sys/devices/system/cpu/cpu*/topology/ http://paste.ubuntu.com/p/5txHGPHpBT/
and
virsh dumpxml of the VM https://pastebin.ubuntu.com/p/sPWHVMn5FX/
CPU on the Hypervisor (works fine):
https://pastebin.ubuntu.com/p/KRNMSThT92/
Hope this helps to dig down the bug.
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