Re: tap device speed

[Antonio Di Bacco <a.dibacco.ks@gmail.com>]

Thank you for your info that are giving me the right heads up
To experiment with VDUSE and share a virtual network interface (I
don't have a physical NIC) between the Linux kernel and DPDK using
VDUSE, I'm about to follow these steps:

Load Required Kernel Modules:
modprobe vduse
Create /dev/vdpa0 device with:
vdpa -d /dev/vdpa0 -n my_vdpa_driver -q queue_count

I wonder which vdpa_driver should I use, I don't have a real NIC
After having this vdpa0 interface up I can run my DPDK application:

./my_dpdk_app --vdev "net_vdpa0,iface=/dev/vdpa0"

Regards,
Antonio.

On Wed, Oct 4, 2023 at 9:08 AM Maxime Coquelin
<maxime.coquelin@redhat.com> wrote:
>
>
>
> On 10/4/23 08:17, David Marchand wrote:
> > On Tue, Oct 3, 2023 at 6:01 PM Stephen Hemminger
> > <stephen@networkplumber.org> wrote:
> >>
> >> On Tue, 3 Oct 2023 10:49:16 +0200
> >> Antonio Di Bacco <a.dibacco.ks@gmail.com> wrote:
> >>
> >>> I understand, could we use another solution ? Like a memif  interface
> >>> in DPDK and libmemif in Linux?
> >>
> >> The issue is accessing kernel networking devices. Both virtio user
> >> and XDP are faster for that. Memif is for doing process to process networking.
> >
> > For dpdk <-> kernel, as you are mentioning virtio-user/vhost, let me
> > add that there is some activity on this side, with VDUSE.
> >
> > Maxime is working on the VDUSE kernel and dpdk bits.
> > He gave a talk about the current status during the summit and some
> > performance numbers:
> > https://dpdksummit2023.sched.com/event/1P9xA/vduse-performance-how-fast-is-it-maxime-coquelin-red-hat
> >
> >
>
> Thanks for sharing David.
> I'd like just to add some more information on VDUSE if you want to
> experiment with VDUSE, which is still under development:
> https://gitlab.com/mcoquelin/vduse-doc
>
> Maxime
>