Two/Dual GeForce RTX 3090s and NVLink: Ubuntu support? At least Blender has support for NVLink

Hi!

I was wondering if you know if Two/Dual GeForce RTX 3090s and NVLink have Ubuntu support? At least Blender has support for NVLink:

I asked the Blender developers and they also said Ubuntu supports NVLink, which made me happy :)

What about you, NVIDIA, do you confirm?

Thank you!

FWIW, I have an NVLink and two RTX 3090s running Ubuntu, and I haven’t been able to get the NVLink to work.

When I run ‘nvidia-smi nvlink -c’ I get just:

GPU 0: GeForce RTX 3090 (UUID: GPU-f634707c-5e3b-b685-ad8c-30e3b916f204)
GPU 1: GeForce RTX 3090 (UUID: GPU-17056259-f618-8028-163a-0f62bf47aae7)

When I run ‘nvidia-smi nvlink -s’ I see:

GPU 0: GeForce RTX 3090 (UUID: GPU-f634707c-5e3b-b685-ad8c-30e3b916f204)
Link 0: <inactive>
Link 1: <inactive>
Link 2: <inactive>
Link 3: <inactive>
GPU 1: GeForce RTX 3090 (UUID: GPU-17056259-f618-8028-163a-0f62bf47aae7)
Link 0: <inactive>
Link 1: <inactive>
Link 2: <inactive>
Link 3: <inactive>

Guidance would be great.

Aw shucks… that doesn’t keep my hopes up :(

Which is weird, I asked from Blender institute and they said NVLink should work fine in Ubuntu with 2 x RTX 3090…

Hmph…

Of course it should work. @ben.hendrickson did you properly seat the bridge, is it lit? Did you try turning off iommu? Please run nvidia-bug-report.sh as root and attach the resulting nvidia-bug-report.log.gz file to your post.