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xen-balloon and 5.10.70

  • To: xen-devel@xxxxxxxxxxxxxxxxxxxx
  • From: Henrik Riomar <rio@xxxxxxxxx>
  • Date: Sun, 3 Oct 2021 11:52:13 +0200
  • Delivery-date: Sun, 03 Oct 2021 10:11:10 +0000
  • List-id: Xen developer discussion <xen-devel.lists.xenproject.org>


Running 5.10.70 on a dom0 shows 100% load on one core for the
xen-balloon kernel thread (was a workqueue before 5.10.70).

I have upgraded two dom0's to 5.10.70 and both of them shows this issue.

Xen version is 4.15.1.

To trigger the problem:

Does not trigger the problem:

(the other system with the issue has "dom0_mem=4096M,max:4096M")


does not matter, in trigging the problem (i.e. autoballon="off", still
gets [xen-ballon] to hog down one core).

Can not see the problem before starting the first domU, and shutting
down all domUs stops xen-balloon to hog the core.

Workaround in a running system is to lower

With max:3000M this was 3072000 (kb), and just lowering it to 3069952
(i.e. by 2 meg) "solved" the issue, and stopped the fan in my laptop :-)

/ Henrik



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