[Virtio-fs] [Qemu] how to use viriofs in qemu without NUMA
Dr. David Alan Gilbert
dgilbert at redhat.com
Tue Jul 5 09:36:54 UTC 2022
* Zhao, Shirley (shirley.zhao at intel.com) wrote:
> Thanks for the information.
> Yes, I also found the memory backend options on s390x, and also copy the command to x86, but failed.
>
> The following is the command used to start qemu + virtiofs + ubuntu 20.04.
> One is worked well using NUMA, another one is failed without NUMA.
> Is there anything wrong?
>
> The worked one with NUMA options:
>
> qemu-system-x86_64 -M pc -cpu host --enable-kvm -smp 2 -m 4G -object memory-backend-file,id=mem,size=4G,mem-path=/dev/shm,share=on -numa node,memdev=mem -chardev socket,id=char0,path=/tmp/vfsd.sock -device vhost-user-fs-pci,queue-size=1024,chardev=char0,tag=myfs -chardev stdio,mux=on,id=mon -mon chardev=mon,mode=readline -device virtio-serial-pci -device virtconsole,chardev=mon -vga none -display none -drive if=virtio,file=ubuntu.img
>
> The failed one without NUMA options:
>
> qemu-system-x86_64 -M pc -cpu host --enable-kvm -smp 2 -m 4G -object memory-backend-file,id=mem,size=4G,mem-path=/dev/shm,share=on -machine q35,memory-backend=mem -chardev socket,id=char0,path=/tmp/vfsd.sock -device vhost-user-fs-pci,queue-size=1024,chardev=char0,tag=myfs -chardev stdio,mux=on,id=mon -mon chardev=mon,mode=readline -device virtio-serial-pci -device virtconsole,chardev=mon -vga none -display none -drive if=virtio,file=ubuntu.img
What error did it give?
20.04 is quite old, what qemu version is it?
I'd have to check when the memdev= went in.
Dave
>
> Thanks.
> - Shirley
>
> -----Original Message-----
> From: Dr. David Alan Gilbert <dgilbert at redhat.com>
> Sent: Tuesday, July 5, 2022 4:04 PM
> To: Thomas Huth <thuth at redhat.com>
> Cc: Zhao, Shirley <shirley.zhao at intel.com>; qemu-devel at nongnu.org; virtio-fs at redhat.com; Stefan Hajnoczi <stefanha at redhat.com>
> Subject: Re: [Qemu] how to use viriofs in qemu without NUMA
>
> * Thomas Huth (thuth at redhat.com) wrote:
> > On 05/07/2022 03.02, Zhao, Shirley wrote:
> > > Hi, all,
> > >
> > > I want to use virtiofs to share folder between host and guest.
> > >
> > > From the guide, it must set the NUMA node.
> > > https://virtio-fs.gitlab.io/howto-qemu.html
> > >
> > > But my guest doesn’t support NUMA.
> > >
> > > Is there any guide to use qemu + virtiofs without NUMA?
> > >
> > > Or does qemu have any plan to support it?
> >
> > Hi!
> >
> > At least on s390x, you can also specify the memory backend via the
> > -machine option instead of using the -numa option, e.g.:
> >
> > qemu-system-s390x -machine memory-backend=mem \
> > -object memory-backend-file,id=mem,...
> >
> > Not sure whether that works on other architectures, too, though.
> > Stefan, David, do you know?
>
> Right, that's the way I do it on x86.
> We wrote virtiofs before the memory-backend option existed, which is why the old docs talk about using the NUMA stuff.
>
> Dave
>
> > Thomas
> >
> --
> Dr. David Alan Gilbert / dgilbert at redhat.com / Manchester, UK
>
--
Dr. David Alan Gilbert / dgilbert at redhat.com / Manchester, UK
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