High dom0 cpu usage by [xen-balloon]

User Support 4.1
#1

After mistakenly switching off the computer without closing most of the vms today, I am experiencing a high cpu usage by dom0 (50% approximately, 75°).
In particular, the task manager shows how is [xen-balloon] to use all this cpu.

Today I had installed bluez in fedora to manage the bluetooth and updated the kernel (5.4.150-1), but uninstall the first and use the previous kernel (5.4.143-1) do not improve the situation.
Any help will be appreciated!

I didn’t find any other topics about this, sorry in this case

My experience so far using Qubes 4.1
#2

There are few other reports of this in https://github.com/QubesOS/updates-status/issues/2645 already. I’ve forwarded them to xen-devel already, and I’m not the only one: xen-balloon - search results

3 Likes
#3

Thanks for your reply! I will follow the reports and hope we could fix this soon and post here some good news

#4

I experience the same using the newest vm-kernel, in memory-constrained VMs (like sys-firewall).

qubes-4.0 / current-testing
kernel-qubes-vm-5.4.150-1

(so I’ve changed the default in-vm-kernel to the previous version).

#5

i had this issue with 4.0 testing. upgrading to 4.1 fixed it.

if you can’t fix/upgrade right away: this bug only triggered when i started enough app-vms so that their combined maxmem exceeded 4 gb, which is not much, but when you trim everything down to a minimum, you may keep a working system without overheating your cpu!

#6

I’ve changed the default kernel in dom0 so every vm have changed its default to previous version, but the problem persist also, also changing only the default in-vm-kernel and let the newest in dom0

Unfortunately I already use 4.1. I think this could be a good workaround, also because the problem is that dom0 uses almost all the ram at its disposal (3050 in my case), but despite I have changed the maximum ram in grub.cfg with a lesser value, it keep using the same amount of ram.

As I use qube in my main laptop I’m worried about having an average temperature of 75°-76° all the time

1 Like
#7

Recent kernel from current-testing repo (5.4.151, 5.10.71) should have it fixed.

3 Likes
#8

I updated it yesterday and everything seem to work fine now, thanks!

#9

after last update to 4.1rc4 (yesterday) from Qubes 4.1 rc3, now the CPU is over heating, before wiht 4.1 rc3 the fan where very quite. shall I go back to rc3 or what is the best way to fix it

thanks in advance for your help

My experience so far using Qubes 4.1
#10

what temperatures for what type of CPU , just curious, I’m getting 40C

#11

After the last upgrade to the final release Q4.1, everything is working perfect!!
Q-Team thanks again for the great work.

#12

I’m still getting some kind of power issue problem, overnight I had XFCE Power Manager setting to “put to sleep after” 10 minutes, in the mornings monitor doesn’t wake up, had to hard reboot again :frowning:

I went 21 days on rc4, after I removed Xscreensaver to simplify/problem solve
(now I’m not sure how to reinstall Xscreensaver or why it is even included in Q4.x)??