From: Henrik Riomar <rio@riomar.se>
To: xen-devel@lists.xenproject.org
Subject: xen-balloon and 5.10.70
Date: Sun, 3 Oct 2021 11:52:13 +0200 [thread overview]
Message-ID: <20211003115213.d7d9d4c1a1bc371cd4b7dc76@riomar.se> (raw)
Hi,
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:
dom_mem=3000M,max:3000M
Does not trigger the problem:
dom_mem=3000M
(the other system with the issue has "dom0_mem=4096M,max:4096M")
/etc/xl/xl.conf:
#autoballon="auto"
or
autoballon="off"
or
autoballon="on"
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
/sys/devices/system/xen_memory/xen_memory0/target_kb.
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
reply other threads:[~2021-10-03 10:11 UTC|newest]
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