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Re: [Qemu-devel] [RFC 0/3] VirtIO RDMA
From: |
Jason Gunthorpe |
Subject: |
Re: [Qemu-devel] [RFC 0/3] VirtIO RDMA |
Date: |
Thu, 11 Apr 2019 17:24:08 +0000 |
On Thu, Apr 11, 2019 at 07:02:15PM +0200, Cornelia Huck wrote:
> On Thu, 11 Apr 2019 14:01:54 +0300
> Yuval Shaia <address@hidden> 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
- [Qemu-devel] [RFC 1/3] virtio-net: Move some virtio-net-pci decl to include/hw/virtio, (continued)
Re: [Qemu-devel] [RFC 0/3] VirtIO RDMA, Yuval Shaia, 2019/04/15