Open Stack

If I am not wrong those are 2 GPUs

"tesla-v100:1" means 1 GPU

So e.g. a flavor with "pci_passthrough:alias": "tesla-v100:2"} will be used
to create an instance with 2 GPUs

Cheers, Massimo

On Tue, Jan 18, 2022 at 11:35 PM Satish Patel <satish.txt at gmail.com> wrote:

> Thank you for the information.  I have a quick question.
>
> [root at gpu01 ~]# lspci | grep -i nv
> 5e:00.0 3D controller: NVIDIA Corporation GV100GL [Tesla V100S PCIe
> 32GB] (rev a1)
> d8:00.0 3D controller: NVIDIA Corporation GV100GL [Tesla V100S PCIe
> 32GB] (rev a1)
>
> In the above output showing two cards does that mean they are physical
> two or just BUS representation.
>
> Also i have the following entry in openstack flavor, does :1 means
> first GPU card?
>
> {"gpu-node": "true", "pci_passthrough:alias": "tesla-v100:1"}
>
>
>
>
>
>
> On Tue, Jan 18, 2022 at 5:55 AM António Paulo <antonio.paulo at cern.ch>
> wrote:
> >
> > Hey Satish, Gustavo,
> >
> > Just to clarify a bit on point 3, you will have to buy a vGPU license
> > per card and this gives you access to all the downloads you need through
> > NVIDIA's web dashboard -- both the host and guest drivers as well as the
> > license server setup files.
> >
> > Cheers,
> > António
> >
> > On 18/01/22 02:46, Satish Patel wrote:
> > > Thank you so much! This is what I was looking for. It is very odd that
> > > we buy a pricey card but then we have to buy a license to make those
> > > features available.
> > >
> > > On Mon, Jan 17, 2022 at 2:07 PM Gustavo Faganello Santos
> > > <gustavofaganello.santos at windriver.com> wrote:
> > >>
> > >> Hello, Satish.
> > >>
> > >> I've been working with vGPU lately and I believe I can answer your
> > >> questions:
> > >>
> > >> 1. As you pointed out in question #2, the pci-passthrough will
> allocate
> > >> the entire physical GPU to one single guest VM, while vGPU allows you
> to
> > >> spawn from 1 to several VMs using the same physical GPU, depending on
> > >> the vGPU type you choose (check NVIDIA docs to see which vGPU types
> the
> > >> Tesla V100 supports and their properties);
> > >> 2. Correct;
> > >> 3. To use vGPU, you need vGPU drivers installed on the platform where
> > >> your deployment of OpenStack is running AND in the VMs, so there are
> two
> > >> drivers to be installed in order to use the feature. I believe both of
> > >> them have to be purchased from NVIDIA in order to be used, and you
> would
> > >> also have to deploy an NVIDIA licensing server in order to validate
> the
> > >> licenses of the drivers running in the VMs.
> > >> 4. You can see what the instructions are for each of these scenarios
> in
> > >> [1] and [2].
> > >>
> > >> There is also extensive documentation on vGPU at NVIDIA's website [3].
> > >>
> > >> [1] https://docs.openstack.org/nova/wallaby/admin/virtual-gpu.html
> > >> [2]
> https://docs.openstack.org/nova/wallaby/admin/pci-passthrough.html
> > >> [3] https://docs.nvidia.com/grid/13.0/index.html
> > >>
> > >> Regards,
> > >> Gustavo.
> > >>
> > >> On 17/01/2022 14:41, Satish Patel wrote:
> > >>> [Please note: This e-mail is from an EXTERNAL e-mail address]
> > >>>
> > >>> Folk,
> > >>>
> > >>> We have Tesla V100 32G GPU and I’m trying to configure with
> openstack wallaby. This is first time dealing with GPU so I have couple of
> question.
> > >>>
> > >>> 1. What is the difference between passthrough vs vGPU? I did google
> but not very clear yet.
> > >>> 2. If I configure it passthrough then does it only work with single
> VM ? ( I meant whole GPU will get allocate to single VM correct?
> > >>> 3. Also some document saying Tesla v100 support vGPU but some folks
> saying you need license. I have no idea where to get that license. What is
> the deal here?
> > >>> 3. What are the config difference between configure this card with
> passthrough vs vGPU?
> > >>>
> > >>>
> > >>> Currently I configure it with passthrough based one one article and
> I am able to spun up with and I can see nvidia card exposed to vm. (I used
> iommu and vfio based driver) so if this card support vGPU then do I need
> iommu and vfio or some other driver to make it virtualize ?
> > >>>
> > >>> Sent from my iPhone
> > >>>
> > >
>
>
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