High Host CPU Usage

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crakej

New Member
Oct 16, 2023
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Hi

This problem has only just appeared for me. I've been pulling my hair out trying to work out what's going on but so far can't find a solution. I noticed this first about 3 or 4 days ago. I've tried disabling c-states in the bios, disabling power efficient turbo, disabling turbo, yet these acpi_pad tasks keep reappearing and using up power.

Does anyone know what I should do?
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Poweredge T430 with 2 x Xeon 2640L 10 Core CPUs
 
Last edited:
Impact said:
According to Intel Lenovo and IBM one "fix" is to unload/blacklist the module.
Click to expand...
I saw that somewhere - is that the right thing to do though, and why did this start in the 1st place?

Did you have this happen? I may have to try this out..
 
Please don't full quote a message you directly reply to. It's redundant as it's directly above your message already.
I don't know if it's necessarily the right thing to do, hence the quotes around fix. I mentioned Intel IBM and Lenovo because they all document this as a fix for it so I guess it's a legit way to deal with it.
 
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The irony is that the acpi_pad is a system kernel module "ACPI Processor Aggregator Driver" that is supposed to handle core count processor power management, and this known issue (search the web how long it has been around) seemingly causes a massive (up to 100%) CPU usage spikes.

You should probably try the fix & see how it goes. If everything goes well & CPU usage backs down - job done. A permanent fix would obviously be better, but you will have to make do.

Code: 
nano /etc/modprobe.d/blacklist.conf

#add line:

blacklist acpi_pad
 
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