Hi, Michal
Thank you for your help.
After compiled and installed libvirt-6.7.0, when I try virsh define
xmlfile, it says "error: invalid argument: could not find capabilities for
arch=x86_64 domaintype=kvm".
The way I compiled and installed libvirt-6.7.0 is according to
https://libvirt.org/compiling.html
My system is Ubuntu20, originally I used apt to install the libvirt, it
works well, just not support HMAT.
Do you know how to fix my current issue?
Thank You
Best
Jin Huang
On Fri, Aug 5, 2022 at 5:34 AM Michal Pr?vozn?k <mprivozn at redhat.com>
wrote:
> On 8/5/22 11:25, Jin Huang wrote:
> > Hi, libvirt-users
> > How could I set up a memory-only and no-cpu NUMA node for the qemu-VM
> > with the XML file?
> >
> > Seems each NUMA cell has to be bundled with some specific cpuids.
> > If I write the element like this, it is wrong.
> >
> > <cpu mode='host-passthrough'>
> > <numa>
> > <cell id='0' cpus='0-3' memory='16'
unit='GiB'/>
> > <cell id='1' cpus='*null*' memory='16'
unit='GiB'/>
> > </numa>
> > </cpu>
> > Also if I ignore the cpus item, it is not acceptable for the virsh
> command.
> >
> > The reason I want the memory-only node is that I want to set up
multiple
> > memory tiers for the VM, just
> > like
> https://stevescargall.com/2022/06/10/using-linux-kernel-memory-tiering/
> >
<https://stevescargall.com/2022/06/10/using-linux-kernel-memory-tiering/
> >
> >
>
> What you want to configure is so called HMAT (Heterogeneous Memory
> Attribute Table). It can be configured by leaving out the @cpus
> attribute completely. For instance like this:
>
> <cpu mode='host-model' check='partial'>
> <numa>
> <cell id='0' cpus='0-5' memory='512000'
unit='KiB' discard='yes'>
> <distances>
> <sibling id='0' value='10'/>
> <sibling id='1' value='21'/>
> </distances>
> <cache level='3' associativity='direct'
policy='writeback'>
> <size value='10' unit='KiB'/>
> <line value='8' unit='B'/>
> </cache>
> <cache level='1' associativity='direct'
policy='writeback'>
> <size value='8' unit='KiB'/>
> <line value='5' unit='B'/>
> </cache>
> </cell>
> <cell id='1' memory='512000'
unit='KiB'>
> <distances>
> <sibling id='0' value='21'/>
> <sibling id='1' value='10'/>
> </distances>
> </cell>
> <interconnects>
> <latency initiator='0' target='0'
cache='1' type='access'
> value='5'/>
> <bandwidth initiator='0' target='0'
type='access' value='204800'
> unit='KiB'/>
> </interconnects>
> </numa>
> </cpu>
>
>
> This was introduced in libvirt-6.6.0 so you may need to upgrade.
>
> Michal
>
>
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