On Thu, 10 May 2018 18:41:09 +0000 "Stephen Bates" <sbates@xxxxxxxxxxxx> wrote: > > Reasons is that GPU are giving up on PCIe (see all specialize link like > > NVlink that are popping up in GPU space). So for fast GPU inter-connect > > we have this new links. > > I look forward to Nvidia open-licensing NVLink to anyone who wants to use it ;-). No doubt, the marketing for it is quick to point out the mesh topology of NVLink, but I haven't seen any technical documents that describe the isolation capabilities or IOMMU interaction. Whether this is included or an afterthought, I have no idea. > > Also the IOMMU isolation do matter a lot to us. Think someone using this > > peer to peer to gain control of a server in the cloud. >From that perspective, do we have any idea what NVLink means for topology and IOMMU provided isolation and translation? I've seen a device assignment user report that seems to suggest it might pretend to be PCIe compatible, but the assigned GPU ultimately doesn't work correctly in a VM, so perhaps the software compatibility is only so deep. Thanks, Alex
