Performance issues while using DPDK with azure accelerated networking

Performance issues while using DPDK with azure accelerated networking

[piyush gupta]

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Hi,

I am running a *D8sV3* type instance on azure with *RHEL7.9* & accelerated
networking enabled on one of the interface.

On this am running my DPDK app which is binding to the VF exposed & its
corresponding netvsc interface via *vdev_netvsc driver* as suggested in
https://learn.microsoft.com/en-us/azure/virtual-network/setup-dpdk
<https://learn.microsoft.com/answers/storage/attachments/267669-dpdk-cpus-perf.png>

DPDK doc : vdev_netvsc.html
<https://learn.microsoft.com/answers/storage/attachments/267669-dpdk-cpus-perf.png>

The expected behaviour is that all traffic should flow through the physical
interface (VF) and not from synthetic device (eth2 in my case).
But I can see all traffic coming to eth2 & dtap0 devices. This is causing
my dpdk cpus to handle RX interrupts for these packets causing major
performance issues & jitters. I am not understanding why all these packets
are being mirrored to slow path.

*Note: All my traffic is UDP.*


[image: dpdk_cpus_perf.png]

[image: azure_pkts_on_eth2.png]

I would like to know if there is any setting I am missing here. This is
causing a lot of problems for me to qualify on Azure cloud with expected
throughput.


Thanks.

Best regards,

Piyush Gupta

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Re: Performance issues while using DPDK with azure accelerated networking

[Hui Ling]

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vdev_netvsc is not what you are looking for.

This is what you need.

http://doc.dpdk.org/guides-22.11/nics/netvsc.html


On Friday, December 23, 2022, piyush gupta <pgupta9393@gmail.com> wrote:
> Hi,
>
> I am running a D8sV3 type instance on azure with RHEL7.9 & accelerated
networking enabled on one of the interface.
>
> On this am running my DPDK app which is binding to the VF exposed & its
corresponding netvsc interface via vdev_netvsc driver as suggested in
https://learn.microsoft.com/en-us/azure/virtual-network/setup-dpdk
>
> DPDK doc : vdev_netvsc.html
>
> The expected behaviour is that all traffic should flow through the
physical interface (VF) and not from synthetic device (eth2 in my case).
> But I can see all traffic coming to eth2 & dtap0 devices. This is causing
my dpdk cpus to handle RX interrupts for these packets causing major
performance issues & jitters. I am not understanding why all these packets
are being mirrored to slow path.
>
> Note: All my traffic is UDP.
>
>
>
>
</mail/u/0/s/?view=att&th=1854395b0da9d888&attid=0.1&disp=emb&realattid=ii_lc04zfx20&zw&atsh=1>
>
</mail/u/0/s/?view=att&th=1854395b0da9d888&attid=0.2&disp=emb&realattid=ii_lc04zfxt1&zw&atsh=1>
>
> I would like to know if there is any setting I am missing here. This is
causing a lot of problems for me to qualify on Azure cloud with expected
throughput.
>
> Thanks.
>
> Best regards,
>
> Piyush Gupta
>
>

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