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    Slow boot on rocky linux 10 latest kernel

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    • henri9813H Offline
      henri9813
      last edited by

      Hello,

      When i boot a Rocky Linux 10 with the latest kernel, it's very slow on cpu XXX spinlock event irq.

      Someone have the same issue ?

      6a83318c-cef3-4ad3-821f-be989c23695f-image.jpeg

      45b08065-ab42-402e-a106-ac7984f46794-image.jpeg

      Thanks !

      poddingueP 1 Reply Last reply Reply Quote 0
      • poddingueP Offline
        poddingue Vates 🪐 @henri9813
        last edited by

        I'm not familiar with the Rocky 10 kernel internals, but a spinlock storm on a vCPU during boot often comes from how the guest kernel handles its paravirtual clock/timer with the host, rather than anything Rocky-specific.
        Could you share your XCP-ng version, and whether an older RL10 kernel (or an RL9 one) boots normally on the same VM? That would tell us if it's genuinely the latest kernel that regressed.
        If it only happens on that kernel and it's hard to test elsewhere, a mention to @Team-Hypervisor-Kernel might help, since they can check whether it reproduces on their side.

        D 1 Reply Last reply Reply Quote 0
        • D Offline
          dinhngtu Vates 🪐 XCP-ng Team @poddingue
          last edited by

          @poddingue FWIW I've seen the same on FC44 as well, but I don't yet know where it came from.

          1 Reply Last reply Reply Quote 1
          • TeddyAstieT Offline
            TeddyAstie Vates 🪐 XCP-ng Team Xen Guru
            last edited by TeddyAstie

            Can reproduce on Fedora 44 and Alpine Linux (6.18.22-0-virt).
            But doesn't occur on Debian 13 (6.12).

            acebmxerA 1 Reply Last reply Reply Quote 0
            • acebmxerA Online
              acebmxer @TeddyAstie
              last edited by acebmxer

              @TeddyAstie

              From Debian 13 cloud inti. Does on every reboot from fresh image.
              Screenshot_20260607_064937.png

              added more vcpus.
              Screenshot_20260607_065144.png

              TeddyAstieT 1 Reply Last reply Reply Quote 0
              • TeddyAstieT Offline
                TeddyAstie Vates 🪐 XCP-ng Team Xen Guru @acebmxer
                last edited by

                @acebmxer which kernel version you have in your Debian guest (uname -a) ?

                acebmxerA M 2 Replies Last reply Reply Quote 0
                • acebmxerA Online
                  acebmxer @TeddyAstie
                  last edited by acebmxer

                  @TeddyAstie

                  This is on fresh install Debian 13 deployed from XO Hub - 6.12.38+deb13-amd64. I do not see this behavior on Ubuntu.

                  after update 6.12.90+deb13.1-amd64
                  still happens.
                  Screenshot_20260607_071338.png

                  Screenshot_20260607_071824.png

                  TeddyAstieT 1 Reply Last reply Reply Quote 0
                  • TeddyAstieT Offline
                    TeddyAstie Vates 🪐 XCP-ng Team Xen Guru @acebmxer
                    last edited by TeddyAstie

                    @acebmxer I don't observe the same issue on Debian 13 Cloud-Init (both 6.12.38+deb13-amd64 and updated 6.12.90+deb13.1-amd64).

                    Though it still takes some time to boot (especially at loading the ramdisk) but it's not related to this pv spinlock issue and mostly a "BIOS guest" related issue.
                    But I'm testing on a Intel machine.

                    henri9813H 1 Reply Last reply Reply Quote 0
                    • henri9813H Offline
                      henri9813 @TeddyAstie
                      last edited by henri9813

                      Hello,

                      To gave more details abouit my case:

                      • XCPNG: 8.3.0
                      • CPU: AMD EPYC 4464P 12-Core Processor
                      • Kernel: 6.12.0-211.18.1.el10_2.x86_64
                      1 Reply Last reply Reply Quote 0
                      • acebmxerA Online
                        acebmxer
                        last edited by

                        I was going to suggest it might be a amd issue. I can try later on work host that are intel.

                        1 Reply Last reply Reply Quote 0
                        • M Offline
                          MajorP93 @TeddyAstie
                          last edited by

                          @TeddyAstie These spinlock events that cause slow boot also happen on my Debian VMs. Also AMD Epyc CPU in my case.

                          I noticed that this only happens for UEFI enabled VMs. VMs booting in BIOS mode do not have this issue.

                          1 Reply Last reply Reply Quote 0

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