KVM guest high load after upgrade to 4.15.0-72

Bug #1858760 reported by Druggo Yang on 2020-01-08
This bug affects 1 person
Affects Status Importance Assigned to Milestone
linux (Ubuntu)

Bug Description

a idle kvm guest system with 4.15.0-70 , load nearly zero:
load average : 0.00, 0.04, 0.05

after upgrade to 4.15.0-72 or 4.15.0-74, load become abnormal:
load average : 0.65, 0.49, 0.41

when apply this patch, load good again:
x86/timer: Force PIT initialization when !X86_FEATURE_ARAT

could you pls apply this patch on upcoming kernel update ?

This bug is missing log files that will aid in diagnosing the problem. While running an Ubuntu kernel (not a mainline or third-party kernel) please enter the following command in a terminal window:

apport-collect 1858760

and then change the status of the bug to 'Confirmed'.

If, due to the nature of the issue you have encountered, you are unable to run this command, please add a comment stating that fact and change the bug status to 'Confirmed'.

This change has been made by an automated script, maintained by the Ubuntu Kernel Team.

Changed in linux (Ubuntu):
status: New → Incomplete
Druggo Yang (druggo) wrote :

lspci output

Druggo Yang (druggo) wrote :

the patch

Changed in linux (Ubuntu):
status: Incomplete → Confirmed
tags: added: patch
Druggo Yang (druggo) on 2020-01-08
summary: - KVM guest abnormal load after upgrade to 4.15.0-72
+ KVM guest high load after upgrade to 4.15.0-72
description: updated
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