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#1 2024-03-18 00:02:02
- meidiro
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- Registered: 2024-03-17
- Posts: 1
Random, completely unexplainable CPU spikes
First of all, currently I'm running X11 with KDE Plasma, and my PC has an AMD CPU (Ryzen 5 7600x) + GPU (RX 7700 XT).
I've been running Arch since November of last year when I got a new PC, and my install worked absolutely fine until I started noticing sound crackles happening in a VM.
I didn't know why until I looked in the KDE system monitor and saw CPU spikes.
Checked journalctl and it still had no errors, checked htop and it didn't register the CPU spikes, I looked around forums, trying to figure out if anybody had this issue
but I couldn't find anything near what I was having.
Tried xfce but that didn't make the CPU spikes go down either, I tried btop and that had the same behavior.
As a last ditch effort I tried using linux-lts and that still didn't get rid of the CPU spikes.
I booted off manjaro on an external SSD afterwards, and that was fine for ~4 weeks until I eventually started getting them again but only when I started games and never when I was idle.
Also tried powertop and that doesn't seem to show anything of interest, but I will still provide it below if it does.
I will have off-times where the CPU spikes don't happen, but the CPU spikes coming back will still be completely random.
example of the CPU spikes:
https://ibb.co/t8Mf3t4
powertop:
https://ibb.co/cCXkwyv
EDIT: powertop might actually be a lead, tick_sched_timer seems to be using a lot of cpu events (900 right now)
Last edited by meidiro (2024-03-18 06:18:36)
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#2 2024-03-18 09:04:40
- seth
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- From: Won't reply 2 private help req
- Registered: 2012-09-03
- Posts: 76,016
Re: Random, completely unexplainable CPU spikes
https://i.ibb.co/qkMGxfd/example.png lacks any scale and just looks like you booted, then did something CPU intense and eventually stopped. Could have been over the course of hours or seconds.
checked htop and it didn't register the CPU spikes
Polling how tightly?
Right now this thread doesn't give any indication of a "spike" and the only symptom seems "sound crackles happening in a VM" what could have a shitton of reasons.
tick_sched_timer is the cpu scheduler, that doesn't lead anywhere even iff you had provided a scale to the absolute count that would allow to deem it "a lot" (per second)
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