You could perhaps set 'cpu.shares' cgroup setting on /machine.slice.
This isn't really a nice level in the traditional sense, rather it is
a relative weighting evaluated against other cgroups at the same level.
So if you change it from 1024 to 512, then processes under /machine.slice
will get 1/2 the CPU time vs stuff under /system.slice or /user.slice,
when there is contention for CPU time.
Thanks for your help.
There is no "machine.slice" on my system. This is an excerpt from "systemd-cgls".
??? ??????system.slice
??? ??????irqbalance.service
??? ??? ??????865 /usr/sbin/irqbalance --foreground
[... blah blah ...]
??? ??????wpa_supplicant.service
??? ??? ??????878 /sbin/wpa_supplicant -u -s -O /run/wpa_supplicant
??? ??????libvirtd.service
??? ??? ?????? 987 /usr/sbin/libvirtd
??? ??? ?????? 1395 /usr/sbin/dnsmasq --conf-file=/var/lib/libvirt/dnsmasq/default.conf --leasefile-ro
--dhcp-script=/usr/lib/libvirt/libvirt_leaseshelper
??? ??? ?????? 1396 /usr/sbin/dnsmasq --conf-file=/var/lib/libvirt/dnsmasq/default.conf --leasefile-ro
--dhcp-script=/usr/lib/libvirt/libvirt_leaseshelper
??? ??? ??????12285 /usr/bin/qemu-system-x86_64 -name guest=UbuntuMATE1804,debug-threads=on -S -object
secret,id=masterKey0,format=raw,file=/var/lib/libvirt/qemu/domain-1-UbuntuMATE1804/master-key.aes -machine...
But I guess there are differences depending on the libvirt version.
I thought of 'nice' because it is an easy way to lower the priority for everything (CPU and disk) at once.
This is actually getting too complicated. I am a lone developer and sysadmin in a small company. I would need to learn too many things about
control groups etc. One of the reasons I am trying libvirt is because of the "Virtual Machine Manager" GUI.
Is there not an easier way? I realised there is a "libvirtd.service" on my system. Is there a simple way in systemd to just lower the
priority of everything under that service? I am assuming that this service is starting all the virtual machines.
Best regards,
rdiez
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