March 10, 20215 yr In one of my VMs I found this in syslog. A running parity check dropped from 122 MB/s to 17 MB/s: Mar 10 13:04:16 TowerVM02 kernel: clocksource: timekeeping watchdog on CPU6: Marking clocksource 'tsc' as unstable because the skew is too large: Mar 10 13:04:16 TowerVM02 kernel: clocksource: 'acpi_pm' wd_now: 3664fc wd_last: 62e7a2 mask: ffffff Mar 10 13:04:16 TowerVM02 kernel: clocksource: 'tsc' cs_now: 43f8233e3b2c cs_last: 43f59d044437 mask: ffffffffffffffff Mar 10 13:04:16 TowerVM02 kernel: tsc: Marking TSC unstable due to clocksource watchdog Mar 10 13:04:16 TowerVM02 kernel: TSC found unstable after boot, most likely due to broken BIOS. Use 'tsc=unstable'. Mar 10 13:04:16 TowerVM02 kernel: sched_clock: Marking unstable (26599124145134, 33401162)<-(26599178070430, -20523118) Mar 10 13:04:16 TowerVM02 kernel: clocksource: Switched to clocksource acpi_pm What's that? BIOS is OVMF from Unraid 6.9.1. Thanks in advance. Edited March 10, 20215 yr by hawihoney
September 13, 20214 yr Author Now on 6.9.2 and new, more powerful hardware this is still happening. The switching clocksource was the reason for the new hardware. Can't believe this is still a problem: root@TowerVM02:~# grep -i clockso /var/log/syslog Aug 25 09:47:29 TowerVM02 kernel: clocksource: refined-jiffies: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 1910969940391419 ns Aug 25 09:47:29 TowerVM02 kernel: clocksource: tsc-early: mask: 0xffffffffffffffff max_cycles: 0x6a8bec17f92, max_idle_ns: 881590537929 ns Aug 25 09:47:29 TowerVM02 kernel: clocksource: jiffies: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 1911260446275000 ns Aug 25 09:47:29 TowerVM02 kernel: clocksource: Switched to clocksource tsc-early Aug 25 09:47:29 TowerVM02 kernel: clocksource: acpi_pm: mask: 0xffffff max_cycles: 0xffffff, max_idle_ns: 2085701024 ns Aug 25 09:47:29 TowerVM02 kernel: tsc: Refined TSC clocksource calibration: 3696.019 MHz Aug 25 09:47:29 TowerVM02 kernel: clocksource: tsc: mask: 0xffffffffffffffff max_cycles: 0x6a8d4c18613, max_idle_ns: 881590899667 ns Aug 25 09:47:29 TowerVM02 kernel: clocksource: Switched to clocksource tsc Sep 1 11:43:10 TowerVM02 kernel: clocksource: timekeeping watchdog on CPU12: Marking clocksource 'tsc' as unstable because the skew is too large: Sep 1 11:43:10 TowerVM02 kernel: clocksource: 'acpi_pm' wd_now: 7b3afe wd_last: 5c3c9a mask: ffffff Sep 1 11:43:10 TowerVM02 kernel: clocksource: 'tsc' cs_now: 808c642ec585e cs_last: 808c5d4de753e mask: ffffffffffffffff Sep 1 11:43:10 TowerVM02 kernel: tsc: Marking TSC unstable due to clocksource watchdog Sep 1 11:43:10 TowerVM02 kernel: clocksource: Switched to clocksource acpi_pm
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