[dpdk-users] Sequential UDP packets

[Tom Barbette]

Are they from the same UDP flow? Else RSS and multi-queing in general could lead to this.

Tom
________________________________________
De : users <users-bounces at dpdk.org> de la part de Pathak, Pravin <pravin.pathak at intel.com>
Envoyé : mercredi 13 novembre 2019 16:52
À : sachin gupta; users at dpdk.org; Nutman, Richard
Objet : Re: [dpdk-users] Sequential UDP packets

Hi Sarvesh -
How are you generating and sending UDP packets? Can you describe a bit more on send and receive configuration?
Pravin

-----Original Message-----
From: users <users-bounces at dpdk.org> On Behalf Of sachin gupta
Sent: Wednesday, November 13, 2019 10:46 AM
To: users at dpdk.org; Nutman, Richard <Richard.Nutman at grassvalley.com>
Subject: Re: [dpdk-users] Sequential UDP packets

 Hi Sarvesh, Richard
In general any router is not supposed to re-order the packets, even when the packets are received from outside.In this case, the packets are created internally only. So as such UDP protocol makes no difference.
One reason i can think is the use of multiple queues, or threads for transmission.
Sachin
    On Wednesday, November 13, 2019, 03:24:35 PM GMT+5:30, Nutman, Richard <richard.nutman at grassvalley.com> wrote:

 Hi Sarvesh,

UDP is not a reliable protocol, not even for the order of packets you receive.
You have to re-order them when you receive them. For example using a sequence number to index them into a circular buffer.

Wireshark does not re-order UDP packets but merely shows them in the order they were captured.

Regards,
Richard

> -----Original Message-----
> From: Sarvesh Verma [mailto:sarveshfwecverma79 at gmail.com]
> Sent: 13 November 2019 07:56
> To: users at dpdk.org
> Subject: [dpdk-users] Sequential UDP packets
>
> Hey DPDK users,
>
> Since last two months I'm struggling to generate my own sequential UDP
> packets through DPDK. At receiving side my packets counts are matching
> but are not in sequence in Wireshark.
> Expected- 1,2,3,4,5,6,7,8,9,10.........
> Getting-1,4,6,8,9,2,3,5,7,10........…
>
> Hope anyone will reply soon.
>
> Thank you
> Sarvesh Verma


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