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Hi Ciara,

Thank you for your quick response and useful tips.
That's a good idea to change the rx flow, I will test it later.

Meanwhile, I tested AF_XDP PMD with 1rx/1tx queue configuration. Th= e performance is too worse than MLX5 PMD, nearly 2/3 drop... total traffic = is 3Gbps.
I also checked some statistics, it shows drops on xdp recv and app inter= nel transfer, it seems xdp recv and send take times, since there is no diff= erence on app side bettween the two tests(dpdk/xdp). 

Are there any extra configuration is required for AF_XDP PMD ?
The XDP PMD should have similar performance as DPDK PMD under 10Gbps ?

Br,
Christian
=B7=A2=BC=FE=C8=CB: Loftus,= Ciara <ciara.loftus@intel.com>
=B7=A2=CB=CD=CA=B1=BC=E4: 2021=C4=EA11=D4=C24=C8=D5 10:19
=CA=D5=BC=FE=C8=CB: Hong Christian <hongguochun@hotmail.com> =B3=AD=CB=CD: users@dpdk.org <users@dpdk.org>; xiaolong.ye@int= el.com <xiaolong.ye@intel.com>
=D6=F7=CC=E2: RE: pmd_af_xdp: does net_af_xdp support different rx/t= x queue configuration
 
>
> Hello DPDK users,
>
> Sorry to disturb.
>
> I am currently testing net_af_xdp device.
> But I found the device configure always failed if I configure my rx qu= eue !=3D tx
> queue.
> In my project, I use pipeline mode, and require 1 rx and several tx qu= eues.
>
> Example:
> I run my app with paramter: "--no-pci --vdev
> net_af_xdp0,iface=3Dens12,queue_count=3D2 --vdev
> net_af_xdp1,iface=3Dens13,queue_count=3D2"
> And config 1 rx and 2 tx queue, it will setup failed by print: "P= ort0
> dev_configure =3D -22"
>
> After checking some xdp docs, I found the rx and tx always bind to use= ,
> which connected to filling and completing ring.
> But I still want to comfirm this with you ? Could you please share you= r
> comments ?
> Thanks in advance.

Hi Christian,

Thanks for your question. Yes, at the moment this configuration is forbidde= n for the AF_XDP PMD. One socket is created for each pair of rx and tx queu= es.
However maybe this is an unnecessary restriction of the PMD. It is indeed p= ossible to create a socket with either one rxq or one txq. I will put looki= ng into the feasibility of enabling this in the PMD on my backlog.
In the meantime, one workaround you could try would be to create an even nu= mber of rxq and txqs but steer all traffic to the first rxq using some NIC = filtering eg. tc.

Thanks,
Ciara

>
> Br,
> Christian
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