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<p>Thanks Sylvain for the pointers.</p>
<p>One of the questions we have is: can we create MIG profiles on
the host and then attach each one or more profile(s) to VMs? This
bug [1] reports that once we attach one profile to a VM, rest of
MIG profiles become unavailable. From what you have said about
using SR-IOV and VFs, I guess this should be possible.<br>
</p>
<p>I think you are talking about "vGPUs with OpenStack Nova" talk on
OpenInfra stage. I will look into it once the videos will be
online. <br>
</p>
<p>[1] <a class="moz-txt-link-freetext" href="https://bugs.launchpad.net/nova/+bug/2008883">https://bugs.launchpad.net/nova/+bug/2008883</a></p>
<p>Thanks</p>
<p>Regards</p>
<p>Mahendra<br>
</p>
<div class="moz-cite-prefix">On 20/06/2023 15:47, Sylvain Bauza
wrote:<br>
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<div dir="ltr" class="gmail_attr">Le mar. 20 juin 2023
à 15:12, PAIPURI Mahendra <<a
href="mailto:mahendra.paipuri@cnrs.fr"
moz-do-not-send="true" class="moz-txt-link-freetext">mahendra.paipuri@cnrs.fr</a>>
a écrit :<br>
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<p>Hello Ulrich,</p>
<p><br>
</p>
<p>I am relaunching this discussion as I noticed that
you gave a talk about this topic at OpenInfra Summit
in Vancouver. Is it possible to share the presentation
here? I hope the talks will be uploaded soon in
YouTube. </p>
<p><br>
</p>
<p>We are mainly interested in using MIG instances in
Openstack cloud and I could not really find a lot of
information by googling. If you could share your
experiences, that would be great.</p>
<p><br>
</p>
</div>
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<div><br>
</div>
<div>Due to scheduling conflicts, I wasn't able to attend
Ulrich's session but his feedback will be greatly listened
to by me.</div>
<div><br>
</div>
<div>FWIW, there was also a short session about how to enable
MIG and play with Nova at the OpenInfra stage (and that one
I was able to attend it), and it was quite seamless. What
exact information are you looking for ?</div>
<div>The idea with MIG is that you need to create SRIOV VFs
above the MIG instances using sriov-manage script provided
by nvidia so that the mediated devices will use those VFs as
the base PCI devices to be used for Nova.</div>
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<p>
</p>
<p>Cheers.</p>
<p><br>
</p>
<p>Regards</p>
<p>Mahendra</p>
</div>
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<div id="m_2020284182605405898divRplyFwdMsg" dir="ltr"><font
style="font-size:11pt" face="Calibri, sans-serif"
color="#000000"><b>De :</b> Ulrich Schwickerath <<a
href="mailto:Ulrich.Schwickerath@cern.ch"
target="_blank" moz-do-not-send="true"
class="moz-txt-link-freetext">Ulrich.Schwickerath@cern.ch</a>><br>
<b>Envoyé :</b> lundi 16 janvier 2023 11:38:08<br>
<b>À :</b> <a
href="mailto:openstack-discuss@lists.openstack.org"
target="_blank" moz-do-not-send="true"
class="moz-txt-link-freetext">openstack-discuss@lists.openstack.org</a><br>
<b>Objet :</b> Re: 答复: Experience with VGPUs</font>
<div> </div>
</div>
<div>
<p>Hi, all,</p>
<p>just to add to the discussion, at CERN we have
recently deployed a bunch of A100 GPUs in PCI
passthrough mode, and are now looking into improving
their usage by using MIG. From the NOVA point of view
things seem to work OK, we can schedule VMs requesting
a VGPU, the client starts up and gets a license token
from our NVIDIA license server (distributing license
keys is our private cloud is relatively easy in our
case). It's a PoC only for the time being, and we're
not ready to put that forward as we're facing issues
with CUDA on the client (it fails immediately in
memory operations with 'not supported', still
investigating why this happens).
<br>
</p>
<p>Once we get that working it would be nice to be able
to have a more fine grained scheduling so that people
can ask for MIG devices of different size. The other
challenge is how to set limits on GPU resources. Once
the above issues have been sorted out we may want to
look into cyborg as well thus we are quite interested
in first experiences with this.</p>
<p>Kind regards, </p>
<p>Ulrich<br>
</p>
<div>On 13.01.23 21:06, Dmitriy Rabotyagov wrote:<br>
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<div>To have that said, deb/rpm packages they are
providing doesn't help much, as:
<div dir="auto">* There is no repo for them, so
you need to download them manually from
enterprise portal</div>
<div dir="auto">* They can't be upgraded anyway,
as driver version is part of the package name.
And each package conflicts with any another one.
So you need to explicitly remove old package and
only then install new one. And yes, you must
stop all VMs before upgrading driver and no, you
can't live migrate GPU mdev devices due to that
now being implemented in qemu. So
deb/rpm/generic driver doesn't matter at the end
tbh.</div>
<br>
<br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">пт, 13 янв.
2023 г., 20:56 Cedric <<a
href="mailto:yipikai7@gmail.com"
target="_blank" moz-do-not-send="true"
class="moz-txt-link-freetext">yipikai7@gmail.com</a>>:<br>
</div>
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<div dir="auto"><br>
Ended up with the very same conclusions than
Dimitry regarding the use of Nvidia Vgrid
for the VGPU use case with Nova, it works
pretty well but:<br>
<br>
- respecting the licensing model as
operationnal constraints, note that guests
need to reach a license server in order to
get a token (could be via the Nvidia SaaS
service or on-prem)<br>
- drivers for both guest and hypervisor are
not easy to implement and maintain on large
scale. A year ago, hypervisors drivers were
not packaged to Debian/Ubuntu, but builded
though a bash script, thus requiering
additional automatisation work and careful
attention regarding kernel update/reboot of
Nova hypervisors.<br>
<br>
Cheers</div>
<br>
<br>
On Fri, Jan 13, 2023 at 4:21 PM Dmitriy
Rabotyagov <<a
href="mailto:noonedeadpunk@gmail.com"
rel="noreferrer noreferrer noreferrer
noreferrer" target="_blank"
moz-do-not-send="true"
class="moz-txt-link-freetext">noonedeadpunk@gmail.com</a>>
wrote:<br>
><br>
> You are saying that, like Nvidia GRID
drivers are open-sourced while<br>
> in fact they're super far from being
that. In order to download<br>
> drivers not only for hypervisors, but
also for guest VMs you need to<br>
> have an account in their Enterprise
Portal. It took me roughly 6 weeks<br>
> of discussions with hardware vendors and
Nvidia support to get a<br>
> proper account there. And that happened
only after applying for their<br>
> Partner Network (NPN).<br>
> That still doesn't solve the issue of how
to provide drivers to<br>
> guests, except pre-build a series of
images with these drivers<br>
> pre-installed (we ended up with making a
DIB element for that [1]).<br>
> Not saying about the need to distribute
license tokens for guests and<br>
> the whole mess with compatibility between
hypervisor and guest drivers<br>
> (as guest driver can't be newer then host
one, and HVs can't be too<br>
> new either).<br>
><br>
> It's not that I'm protecting AMD, but
just saying that Nvidia is not<br>
> that straightforward either, and at least
on paper AMD vGPUs look<br>
> easier both for operators and end-users.<br>
><br>
> [1] <a
href="https://github.com/citynetwork/dib-elements/tree/main/nvgrid"
rel="noreferrer noreferrer noreferrer
noreferrer noreferrer" target="_blank"
moz-do-not-send="true"
class="moz-txt-link-freetext">
https://github.com/citynetwork/dib-elements/tree/main/nvgrid</a><br>
><br>
> ><br>
> > As for AMD cards, AMD stated that
some of their MI series card supports SR-IOV
for vGPUs. However, those drivers are never
open source or provided closed source to
public, only large cloud providers are able to
get them. So I don't really recommend getting
AMD cards for vGPU unless you are able to get
support from them.<br>
> ><br>
><br>
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