On Sun, Sep 15, 2019 at 12:21:08PM +0200, info@xxxxxxxxxx wrote:
Hi folks! i created a server with this XML file: <domain type='lxc'> <name>lxctest1</name> <uuid>227bd347-dd1d-4bfd-81e1-01052e91ffe2</uuid> <metadata> <libosinfo:libosinfo xmlns:libosinfo="http://libosinfo.org/xmlns/libvirt/domain/1.0";> <libosinfo:os id="http://centos.org/centos/6.9"/> </libosinfo:libosinfo> </metadata> <memory unit='KiB'>1024000</memory> <currentMemory unit='KiB'>1024000</currentMemory> <vcpu>2</vcpu> <numatune> <memory mode='strict' placement='auto'/> </numatune> <resource> <partition>/machine</partition> </resource> <os> <type arch='x86_64'>exe</type> <init>/sbin/init</init> </os> <idmap> <uid start='0' target='200000' count='65535'/> <gid start='0' target='200000' count='65535'/> </idmap> <features> <privnet/> </features> <clock offset='utc'/> <on_poweroff>destroy</on_poweroff> <on_reboot>restart</on_reboot> <on_crash>destroy</on_crash> <devices> <emulator>/usr/libexec/libvirt_lxc</emulator> <filesystem type='mount' accessmode='mapped'> <source dir='/mnt'/> <target dir='/'/> </filesystem> <interface type='network'> <mac address='00:16:3e:3e:3e:bb'/> <source network='Public Network'/> </interface> <console type='pty'> <target type='lxc' port='0'/> </console> </devices> </domain> I would expect it to have 2 cpu cores and 1 GB RAM. The RAM config works. The CPU config does not:
You probably checked /proc/meminfo. That is provided by libvirt using fuse filesystem, but at least it is guaranteed thanks to cgroups. We do not (and I don't think we even can, at least reliably) do that with cpuinfo. [...]
It gives me all CPU's from the host.
Although if you ran some perf benchmark it should just cap at 2 cpus.
I also tried it with <cpu> <topology sockets='1' cores='2' threads='1'/> </cpu>
We should not allow this, IMO. The reason is that we cannot guarantee or even emulate this (or even the number of CPUs for that matter). That's not how containers work. We can provide /proc/cpuinfo through a fuse filesystem, but if the code actually asks the cpu directly there is no layer in which to emulate the returned information.
That didnt help too. I tried to modify the vcpus through virsh: #virsh -c lxc:/// setvcpus lxctest1 2 error: this function is not supported by the connection driver: virDomainSetVcpus
This should not work for LXC, but it does not make sence because if you look at the XML we allow `<vcpus>2</vcpus>`.
Which didnt work too. This happens on:
Unfortunately anywhere, for the reasons said above. Ideally it should not be able to specify <vcpus/>, but rather just <cputune/>, but I don't think we can change that semantics now that we supported the former for quite some time.
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