On Thu, Apr 11, 2019 at 07:02:15PM +0200, Cornelia Huck wrote: > On Thu, 11 Apr 2019 14:01:54 +0300 > Yuval Shaia <yuval.shaia@xxxxxxxxxx> wrote: > > > Data center backends use more and more RDMA or RoCE devices and more and > > more software runs in virtualized environment. > > There is a need for a standard to enable RDMA/RoCE on Virtual Machines. > > > > Virtio is the optimal solution since is the de-facto para-virtualizaton > > technology and also because the Virtio specification > > allows Hardware Vendors to support Virtio protocol natively in order to > > achieve bare metal performance. > > > > This RFC is an effort to addresses challenges in defining the RDMA/RoCE > > Virtio Specification and a look forward on possible implementation > > techniques. > > > > Open issues/Todo list: > > List is huge, this is only start point of the project. > > Anyway, here is one example of item in the list: > > - Multi VirtQ: Every QP has two rings and every CQ has one. This means that > > in order to support for example 32K QPs we will need 64K VirtQ. Not sure > > that this is reasonable so one option is to have one for all and > > multiplex the traffic on it. This is not good approach as by design it > > introducing an optional starvation. Another approach would be multi > > queues and round-robin (for example) between them. > > > > Expectations from this posting: > > In general, any comment is welcome, starting from hey, drop this as it is a > > very bad idea, to yeah, go ahead, we really want it. > > Idea here is that since it is not a minor effort i first want to know if > > there is some sort interest in the community for such device. > > My first reaction is: Sounds sensible, but it would be good to have a > spec for this :) I'm unclear why you'd want to have a virtio queue for anything other that some kind of command channel. I'm not sure a QP or CQ benefits from this?? Jason _______________________________________________ Virtualization mailing list Virtualization@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linuxfoundation.org/mailman/listinfo/virtualization
