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despite being way less utilized arm4 sees load-spikes up to 75 and is around 25 quite constantly according to: https://monitor.qa.suse.de/d/WDopenqaworker-arm-4/worker-dashboard-openqaworker-arm-4?viewPanel=54694&orgId=1&from=1633952613651&to=1634557413651 - this could hint to IO performance issues.

Disk IO is 10x less compared to arm3 on arm4: https://monitor.qa.suse.de/d/WDopenqaworker-arm-4/worker-dashboard-openqaworker-arm-4?viewPanel=13782&orgId=1&from=1633953007558&to=1634557807558 (expected, less load) but IO response times seem to be ~50% worse according to https://monitor.qa.suse.de/d/WDopenqaworker-arm-4/worker-dashboard-openqaworker-arm-4?viewPanel=56720&orgId=1&from=1633953007558&to=1634557807558

network IO seems fine. Higher packet drops can be observed on arm4 & arm5 (exactly the same pattern, so hinting to the switch) but IMHO this shouldn't cause such a performance-hit

There's still a lot of failed jobs from the #101271 stress test that should be searched for patterns. Maybe that will give some hints for where to look with followup investigations.

The workers arm-4/5 went offline on 05.12.2021. IPMI still responds so I invoked a power cycle. However, they both workers didn't boot successfully. They've got both stuck in the early boot:

Loading Linux 5.15.5-lp153.2.g83fc974-default ...
Loading initial ramdisk ...
EFI stub: Booting Linux Kernel...
EFI stub: EFI_RNG_PROTOCOL unavailable
EFI stub: ERROR: FIRMWARE BUG: kernel image not aligned on 64k boundary
EFI stub: ERROR: FIRMWARE BUG: Image BSS overlaps adjacent EFI memory region
EFI stub: Using DTB from configuration table
EFI stub: Exiting boot services...
INFO:    Node: 0 :: REP: 0x0, REP-FAIL: 0x0, MBIST: 0x0, MBIST-FAIL: 0x803c3c
INFO:    Node: 1 :: REP: 0x0, REP-FAIL: 0x0, MBIST: 0x0, MBIST-FAIL: 0x803c3c
[    0.000000][    T0] Booting Linux on physical CPU 0x0000000000 [0x431f0af2]
[    0.000000][    T0] Linux version 5.15.5-lp153.2.g83fc974-default (geeko@buildhost) (gcc (SUSE Linux) 11.2.1 20210816 [revision 056e324ce46a7924b5cf10f61010cf9dd2ca10e9], GNU ld (GNU Binutils; SUSE Linux Enterprise 15) 2.37.20211103-7.26) #1 SMP Thu Nov 25 09:36:40 UTC 2021 (83fc974)
[    0.000000][    T0] efi: EFI v2.70 by American Megatrends
[    0.000000][    T0] efi: ESRT=0xf9515018 SMBIOS=0xfe390000 SMBIOS 3.0=0xfe380000 ACPI 2.0=0xfd8d0000 MOKvar=0xf7bd7000 MEMRESERVE=0xf4801798 
[    0.000000][    T0] esrt: Reserving ESRT space from 0x00000000f9515018 to 0x00000000f9515050.
[    0.000000][    T0] ACPI: Early table checksum verification disabled
…
[   39.152724][    T1] pci_bus 0000:80: resource 4 [mem 0x60000000-0x7fffffff window]
[   39.160282][    T1] pci_bus 0000:80: resource 5 [mem 0x14000000000-0x17fffffffff window]
[   39.168366][    T1] pci_bus 0000:91: resource 1 [mem 0x60000000-0x600fffff]
[   39.214998][    T1] iommu: Default domain type: Passthrough 
[   39.220723][    T1] pci 0000:0d:00.0: vgaarb: VGA device added: decodes=io+mem,owns=none,locks=none
[   39.229763][    T1] pci 0000:0d:00.0: vgaarb: bridge control possible
[   39.236201][    T1] pci 0000:0d:00.0: vgaarb: setting as boot device (VGA legacy resources not available)
[   39.245755][    T1] vgaarb: loaded
[   39.249503][    T1] SCSI subsystem initialized
[   39.254128][    T1] pps_core: LinuxPPS API ver. 1 registered
[   39.259785][    T1] pps_core: Software ver. 5.3.6 - Copyright 2005-2007 Rodolfo Giometti <giometti@linux.it>
[   39.269652][    T1] PTP clock support registered
[   39.274282][    T1] EDAC MC: Ver: 3.0.0
[   39.278314][    T1] Registered efivars operations
[   39.287410][    T1] NetLabel: Initializing
[   39.291497][    T1] NetLabel:  domain hash size = 128
[   39.296541][    T1] NetLabel:  protocols = UNLABELED CIPSOv4 CALIPSO
[   39.302898][    T1] NetLabel:  unlabeled traffic allowed by default
<no further log messages>

I removed both workers from salt and paused the host-up alerts.

I also gave power cycling arm-4 a try and for me it ended at a slightly different point:

...
[   27.159822][    T1] pci_bus 0000:0e: resource 1 [mem 0x43100000-0x432fffff]
[   27.196956][    T1] ARMH0011:00: ttyAMA0 at MMIO 0x402020000 root bus resource [mem 0x60000000-0x7fffffff window]
[   38.675918][    T1] pci_bus 0000:80: root bus resource [mem 0x14000000000-0x17fffffffff window]
[   38.684606][    T1] pci_bus 0000:80: root bus resource [bus 80-ff]
[   38.690813][    T1] pci 0000:80:00.0: [177d:af00] type 00 class 0x060000
[   38.697639][    T1] pci 0000:80:01.0: [177d:af84] type 01 class 0x060400
[   38.704369][    T1] pci 0000:80:01.0: PME# supported from D0 D3hot D3cold
[   38.711273][    T1] pci 0000:80:02.0: [177d:af84] type 01 class 0x060400
[   38.718000][    T1] pci 0000:80:02.0: PME# supported from D0 D3hot D3cold
[   38.724911][    T1] pci 0000:80:03.0: [177d:af84] type 01 class 0x060400
[   38.731640][    T1] pci 0000:80:03.0: PME# supported from D0 D3hot D3cold
[   38.738539][    T1] pci 0000:80:04.0: [177d:af84] type 01 class 0x060400
[   38.745267][    T1] pci 0000:80:04.0: PME# supported from D0 D3hot D3cold
[   38.752161][    T1] pci 0000:80:05.0: [177d:af84] type 01 class 0x060400
[   38.758892][    T1] pcrom D0 D3hot D3cold
[   38.888346][    T1] pci 0000:80:0f.0: [14e4:9026] type 00 class 0x0c0330
[   38.895048][    T1] pci 0000:80:0f.0: reg 0x10: [mem 0x14000030000-0x1400003ffff 64bit pref]
[   38.903479][    T1] pci 0000:80:0f.0: reg 0x18: [mem 0x14000020000-0x1400002ffff 64bit pref]
[   38.911999][    T1] pci 0000:80:0f.1: [14e4:9026] type 00 class 0x0c0330
[   38.918695][    T1] pci 0000:80:0f.1: reg 0x10: [mem 0x14000010000-0x1400001ffff 64bit pref]
[   38.927129][    T1] pci 0000:80:0f.1: reg 0x18: [mem 0x14000000000-0x1400000ffff 64bit pref]
[   38.935693][    T1] acpiphp: Slot [1] registered
[   38.940380][    T1] acpiphp: Slot [1-1] registered
[   38.945240][    T1] acpiphp: Slot [1-2] registered
[   38.950096][    T1] acpiphp: Slot [1-3] registered
[   38.954941][    T1] pci 0000:91:00.0: [8086:0a54] type 00 class 0x010802
[   38.961645][    T1] pci 0000:91:00.0: reg 0x10: [mem 0x60000000-0x60003fff 64bit]
[   38.969148][    T1] pci 0000:91:00.0: reg 0x30: [mem 0xffff0000-0xffffffff pr
<no further log messages>

The machine does boot with the 5.14.14 kernel though. Upgrading to 5.15.10 did not work, gets stuck at the same point during boot.

Downgraded both machines to the default Leap 15.3 kernel, so they are working again.

Yes. The outcome of #104304 is that os-autoinst's fullstack test is not sufficient to find any difference between arm-1/2/3 and 4/5.

The last time we spoke about we thought of the idea to involve ARM experts. okurz asked ggardet_arm in https://app.element.io/#/room/#openqa:opensuse.org (or maybe it was #opensuse-factory ) and he offered help but needs more details about the machines. So I suggest to get details, e.g. log in, call dmesg and dmidecode and provide that details in the ticket and ask ggardet_arm again. Maybe something about hugepages, cpu flags, some boot kernel parameters to work around I/O quirks, anything like that. We created a new specific suggestion in a subtask.

Conversation https://suse.slack.com/archives/C02CANHLANP/p1656568851927729 is also related