From: Stephen Hemminger <stephen@networkplumber.org>
To: Yang Luan <luan.penny@gmail.com>
Cc: users@dpdk.org
Subject: Re: running DPDK application on Azure
Date: Wed, 13 Apr 2022 16:36:19 -0700 [thread overview]
Message-ID: <20220413163619.546655de@hermes.local> (raw)
In-Reply-To: <CAPHT=bYVN1+sKCsZ6tbbRwAtcGNbKoEX75t56dFr=BSQO-pi1w@mail.gmail.com>
On Wed, 13 Apr 2022 11:41:30 -0700
Yang Luan <luan.penny@gmail.com> wrote:
> Thanks Stephen.
>
> Is the Netvsc PMD selected by default or I'll need to specify it somewhere?
>
> Since I'm running a proprietary UDP protocol, 3rd parties (e.g. Azure)
> won't know how a flow is established. I'm curious how exactly Azure selects
> which NIC to receive a given packet?
>
> Yang
>
> On Wed, Apr 13, 2022 at 8:58 AM Stephen Hemminger <
> stephen@networkplumber.org> wrote:
>
> > On Tue, 12 Apr 2022 13:09:51 -0700
> > Yang Luan <luan.penny@gmail.com> wrote:
> >
> > > Hi,
> > >
> > > We have an application using DPDK on AWS and would like to port it to
> > > Azure. What would be recommended PMD to use? If I understand correctly,
> > we
> > > can either use the Netvsc PMD or the vdev_Netvsc PMD. It seems the Netvsc
> > > PMD is newer.
> >
> > Short answer:
> >
> > Netvsc PMD is faster and can handle events better.
> > vdev_netvsc/failsafe/tap is slower but can emulate some types of rte_flow.
> >
> > >
> > > An alternative is to use the mlx4 PMD by only attaching to the mlx NIC's
> > > PCI address. As I understand it, the concern is the mlx nic may not
> > receive
> > > all the packets. We run a proprietary UDP based protocol on top of DPDK.
> > > Are all UDP packets guaranteed to be received by the mlx NIC?
> >
> > That won't work. the MLX device only sees established flows.
> >
The choice is made based on whether vmbus is unbound from kernel or not.
If vmbus is left bound to kernel, then hv_netvsc will look at all the network
devices, and those without any routes it will setup. The setup makes the
TAP/failsafe sub devices.
If vmbus device is unbound from network device and instead bound to hv_uio_generic,
then the DPDK startup code will see it and should setup from there.
The documentation is there in many places.
prev parent reply other threads:[~2022-04-13 23:36 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-04-12 20:09 Yang Luan
2022-04-13 15:58 ` Stephen Hemminger
2022-04-13 18:41 ` Yang Luan
2022-04-13 23:36 ` Stephen Hemminger [this message]
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