apparently, this issue will get fixed upstream (in systemd package):
https://github.com/systemd/systemd/pull/353#issuecomment-658810289
https://github.com/systemd/systemd/pull/16476
roland
Am 15.07.20 um 19:18 schrieb Roland:
>if i change VMs machine type from i440fx(default) to q35 the problem
>goes away.
>
>the same applies when running "powertop --auto-tune" inside the guest
>(with i440fx type - enable autosuspend for usb-controller + tablet
device).
third option (for VMs without gui):
set "use tablet for pointer " to "No" in VM's options
https://forum.proxmox.com/threads/high-cpu-usage-of-usb-tablet-device-in-debian.45307/
https://forum.proxmox.com/threads/use-tablet-for-pointer-option-causing-cpu-usage-on-linux.54084/
roland
Am 14.07.20 um 19:16 schrieb Roland:
nice :)
what guest OS do you use and which showed the problem ?
as i think that q35 will not be default in kvm or proxmox anytime
soon, shouldn't we perhaps file a bug report for every distro affected ?
is there someone who likes to work with this (help testing,
writing/tracking bug reports...) ?
could perhaps save some tons of CO2 ....
roland
Am 14.07.20 um 18:05 schrieb Atila Vasconcelos:
Wow, I just tried this at my servers (very old Dell PowerEdge 2950);
The results are impressive!
8o
ABV
On 2020-07-13 3:15 a.m., Roland wrote:
hello,
i have found that there is an old bug still around in linux, which is
causing quite an amount of unnecessary cpu consumption in kvm/proxmox,
and thus, wasting precious power.
i run some proxmox installations on older systems and on those, it's
quite significant difference.
on the slowest system, a single debian 10 VM , kvm process is at
20% cpu
(VM is 100% idle) when this issue is present.
if i change VMs machine type from i440fx(default) to q35 the problem
goes away.
the same applies when running "powertop --auto-tune" inside the guest
(with i440fx type - enable autosuspend for usb-controller + tablet
device).
on some L5630 machine, in proxmox summary i see "CPU usage" drop from
10% to <1%.
see:
https://bugzilla.redhat.com/show_bug.cgi?id=478317
https://bugzilla.redhat.com/show_bug.cgi?id=949547
i guess this information could make a difference for people who run a
large amount of virtual machines or use older systems/cpu's.
on most recent cpu's, i think the difference is not that big.
anyway, i really wonder how linux bugs have such great survival
capability....
regards
roland
more references:
https://lists.gnu.org/archive/html/qemu-devel/2010-04/msg00149.html
https://www.redhat.com/archives/vfio-users/2015-November/msg00159.html
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