Re: Can RDMA testing be done with one system?

On Tue, Jul 28, 2026 at 7:00=E2=80=AFPM Rick Macklem <[email protected]=
m> wrote:
>
> On Tue, Jul 28, 2026 at 6:44=E2=80=AFPM Vin=C3=ADcius Ferr=C3=A3o
> <[email protected]> wrote:
> >
> > With one is impossible I think because virtualized RDMA devices never r=
eally worked well, or=E2=80=A6 I=E2=80=99m unaware of it...
> >
> > Also there=E2=80=99s no =E2=80=9Cloopback=E2=80=9D for RDMA.
> >
> > You can use one machine if you have two cards. This works, but both car=
ds must be connected between them, in a point to point network.
> >
> > If you want I can arrange access to our testing servers. We have not on=
ly IB but also RoCEv2.
> Thanks for the offer, but I'd like to be able to do testing using FreeBSD=
's
> Netperf cluster, since that is a FreeBSD resource that I can use long ter=
m.
> (It also happens to be located in Canada, so net access to it might not b=
e
> too brutal.)
Not to mention..lottsa crashes for the early testing. The Netperf cluster d=
oes
give me console access, etc.

Anyhow, thanks for the offer, rick

>
> rick
> ps: The Netperf cluster does have two systems with Mellanox cards, but on=
e
>       of them is busy, so I thought I'd check, in case I could do
> testing with only
>       one of them.
>
> >
> > Regards,
> >
> > Sent from my iPhone
> >
> > > On 28 Jul 2026, at 22:39, Rick Macklem <[email protected]> wrote=
:
> > >
> > > =EF=BB=BFHi,
> > >
> > > I have assumed that a Mellanox NIC will only do RDMA
> > > to another system with a Mellanox NIC.
> > >
> > > Is that correct or is there a way to do RDMA testing
> > > with a single system with a single NIC?
> > >
> > > Thanks for any info, rick
> > >