You have been subscribed to a public bug: 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. ** Affects: linux (Ubuntu) Importance: Undecided Status: New -- Actual kernel don't want to make more than 64 cpus available https://bugs.launchpad.net/bugs/1905993 You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. -- 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
