RE: Issue with DPDK-Burst Replay – No Frame Transmission Observed Despite Successful Replay

[Ivan Malov]

On Thu, 24 Jul 2025, Gokul K R (MS/ETA7-ETAS) wrote:

Hi,

In the meantime, I was able to successfully replay my PCAP file using the 
dpdk-burst-replay tool from your repository 
(https://github.com/FraudBuster/dpdk-burst-replay). Below is the output from 
the tool:

sudo ./src/dpdk-replay wendutput.pcap 0000:01:00.0
preloading wendutput.pcap file (of size: 5900 bytes)
file read at 100.00%
read 100 pkts (for a total of 5900 bytes). max packet length = 43 bytes.
-> Needed MBUF size: 174
-> Needed number of MBUFS: 100
-> Needed Memory = 16.992 Mo
-> Needed Hugepages of 1 Go = 1
-> Needed CPUs: 1
-> Create mempool of 100 mbufs of 174 octs.
-> Will cache 100 pkts on 1 caches.
file read at 100.00%
-> NIC port 0 ready.

RESULTS :
[thread 00]: 1.703287 Gbit/s, 3874767.513949 pps on 0.000026 sec (0 pkts 
dropped)
TOTAL        : 1.703 Gbit/s. 3874767.514 pps.
Total dropped: 0/100 packets (0.000000%)
Cannot close started device (port 0)
I have a question:

#1: The tool shows that packets are transmitted, but they are not received on 
the other end. The same setup works fine with the testpmd application. Since 
the transmit-side NIC is bound to DPDK, I cannot use tools like Wireshark or 
tcpdump to verify transmission. Is there any recommended way to confirm whether 
packets are actually being sent from the DPDK-bound NIC?

Once again, are you sure destination MAC addresses in the replayed packets match
that of the receiver NIC? Have you enabled promiscuous mode on the receiver?

Thank you.

In parallel, as per your suggestion, I’m also exploring the DPDK PCAP PMD to 
replay my PCAP file.


Mit freundlichen Grüßen / Best regards

K R Gokul

Compact Devices, ESxx, Product and System Acceptance Tests (MS/ETA7-ETAS)
Robert Bosch GmbH | Postfach 10 60 50 | 70049 Stuttgart | GERMANY | 
http://www.bosch.com/
Mobile +91-9003755978 | kr.go...@in.bosch.com

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Rückert

-----Original Message-----
From: Ivan Malov <ivan.ma...@arknetworks.am>
Sent: Thursday, July 24, 2025 3:55 PM
To: Gokul K R (MS/ETA7-ETAS) <kr.go...@in.bosch.com>
Cc: us...@dpdk.org; dev@dpdk.org; Nivethitha N Shanmugasundaram (ETAS-ICA/XPC-Fe6) 
<nshanmugasundaram.nivethi...@etas.com>; Aloysius Nishanth Britto (MS/ETA7-ETAS) 
<britto.aloysiusnisha...@in.bosch.com>
Subject: RE: Issue with DPDK-Burst Replay – No Frame Transmission Observed 
Despite Successful Replay

Hi,

On Thu, 24 Jul 2025, Gokul K R (MS/ETA7-ETAS) wrote:

Hi Ivan,

I hope you're doing well.

Point #1:
Since the DPDK-Burst Replay tool is not an official part of the DPDK project 
and is community-developed, could you please let us know whom we should contact 
for support or further information regarding this tool?

For the very same reason (not an in-house tool), I have no way of knowing.
Perhaps take a look at repository owner's profile on GitHub or something.

Point #2:
We have identified an issue while using dpdk-burst replay tool.
During EAL mempool initialization, “--pci-whitelist” parameter is given as an 
argument for “rte_eal_init” function. However, when rte_eal_init is executed 
with these arguments, it fails with the following error:

./dpdk-replay: unrecognized option ‘--pci-whitelist’
Invalid command line argument

We couldn’t find any official documentation on the --pci-whitelist parameter. 
Could you help clarify its purpose and whether this argument is essential for 
the tool to operate correctly?

1) In 2020, commit db27370b5720 ("eal: replace blacklist/whitelist options")
   renamed this argument. Now it is '-a' ('--allow') and '-b' ('--block') [1].
2) The argument is application-agnostic and is designed to give a finer control
   on which devices get picked by DPDK during EAL initialisation.
3) Whether the argument is needed for the use of this particular application
   is not apparent to me. One should refer to the application's documentation.

Point #3:
Could you also suggest any official DPDK tool that supports replaying PCAP 
files? This would help us explore alternatives that are actively maintained by 
the DPDK community.

Please take a look at DPDK pcap PMD [2]. It may meet your needs.

[1] 
https://doc.dpdk.org/guides-25.07/linux_gsg/linux_eal_parameters.html#device-related-options
[2] https://doc.dpdk.org/guides-25.07/nics/pcap_ring.html

Thank you.

Looking forward to your inputs.

Best regards,
Gokul K R
-----Original Message-----
From: Ivan Malov <ivan.ma...@arknetworks.am>
Sent: Wednesday, July 23, 2025 11:43 AM
To: Gokul K R (MS/ETA7-ETAS) <kr.go...@in.bosch.com>
Cc: us...@dpdk.org; dev@dpdk.org; Nivethitha N Shanmugasundaram
(ETAS-ICA/XPC-Fe6) <nshanmugasundaram.nivethi...@etas.com>
Subject: RE: Issue with DPDK-Burst Replay – No Frame Transmission
Observed Despite Successful Replay

On Wed, 23 Jul 2025, Ivan Malov wrote:

Hi,

On Wed, 23 Jul 2025, Gokul K R (MS/ETA7-ETAS) wrote:

Hi Ivan Malov 😊

Use Case:
I'm currently using the DPDK-Burst-Replay tool to replay captured
PCAP files at specific data rates (e.g., 150–200 Mbps).

Response to your feedback:
Point 1: "Port 0 is not on the good NUMA ID (-1)"
I’m aware that this message is printed due to the NUMA ID being
returned as -1.
I've just started diving into the source code and found that the
call to
rte_eth_dev_socket_id() returns -1, which typically indicates an error.

No, -1 typically translates to 'SOCKET_ID_ANY'. In order to rule out 'EINVAL'
in 'rte_errno', one should attempt to invoke 'rte_eth_dev_socket_id'
within the loop of 'RTE_ETH_FOREACH_DEV' (see examples in DPDK) and
print the socket ID.

However, the current implementation does not output the rte_errno,
which could help identify the root cause. I'm working on modifying
the code to print the error code for better debugging.

Point 2: "NIC Link is UP"
Yes, on the NIC side, the link is up. I'm also able to transmit
packets successfully using the testpmd application.

Question:
Could you please confirm if the current version of the
DPDK-Burst-Replay tool supports replaying Ethernet frames larger
than
64 bytes (e.g., up to
1500 bytes)? Or has the tool been enhanced to support this use case?

The tool seems like an external application. Try to look for any
mentions of API 'rte_eth_dev_set_mtu' or just the term 'mtu' in that
source code. If there are no such mentions, then default MTU applies,
which depends on the driver.

Have you tried querying statistics to find the cause of the drops?

Also, given the fact that the application replays some pcap traffic, have you 
made sure the receiver (where you seek to watch the replayed traffic arrive) 
has got 'promiscuous' mode [1] enabled? IIRC, 'test-pmd' enables it by default.

[1]
https://doc/.
dpdk.org%2Fapi-25.07%2Frte__ethdev_8h.html%23a5dd1dedaa45f05c72bcc3549
5e441e91&data=05%7C02%7CKR.Gokul%40in.bosch.com%7Cb670bffe53b8485c75a9
08ddca9c56bf%7C0ae51e1907c84e4bbb6d648ee58410f4%7C0%7C0%7C638889495040
750455%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDA
wMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sda
ta=7xqux5VPYgMerNkhy7YOCzj371irrkhEFFrkHTuK1pg%3D&reserved=0

Thank you.

Thank you.

Thanks for your time and support!

Best regards,
Gokul K.R





-----Original Message-----
From: Ivan Malov <ivan.ma...@arknetworks.am>
Sent: Friday, July 18, 2025 5:29 PM
To: Gokul K R (MS/ETA7-ETAS) <kr.go...@in.bosch.com>
Cc: us...@dpdk.org; dev@dpdk.org
Subject: Re: Issue with DPDK-Burst Replay – No Frame Transmission
Observed Despite Successful Replay

Hi,

(please see below)

On Fri, 18 Jul 2025, Gokul K R (MS/ETA7-ETAS) wrote:

Hi Team,

I’m currently working with the dpdk-burst-replay tool and
encountered an issue during execution. Below are the details:


___________________________________________________________________
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___________________________________________________________________
_ __ ______________________________________________


Observation:
During replay, we received the following informational message:

port 0 is not on the good numa id (-1)

Which API was used to check this? Was API [1] used? If not, what
does it show in the absence of 'numactl' command?

[1]
https://doc/
.dpdk.org%2Fapi-25.03%2Frte__ethdev_8h.html%23ad032e25f712e6ffeb0c19
e
ab1ec1fd2e&data=05%7C02%7CKR.Gokul%40in.bosch.com%7C53a20884cad14b94
7
a0008ddc9aff5bf%7C0ae51e1907c84e4bbb6d648ee58410f4%7C0%7C0%7C6388884
7
9792834143%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwL
j
AuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C
%
7C&sdata=XxPfmsX4WsR83ifUfkkup2jIOw4PU%2FX%2BdefEqVfazj4%3D&reserved
=
0

As per the DPDK mailing list discussions, this warning is typically
benign—often seen on NICs like Intel I225/I210, which do not report
NUMA affinity. Hence, we proceeded with execution.


___________________________________________________________________
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_ __ ______________________________________________


Command Used:

sudo numactl --cpunodebind=0 --membind=0 ./src/dpdk-replay
Original_MAC.pcap 0000:01:00.1

Execution Output:

preloading Original_MAC.pcap file (of size: 143959 bytes)

file read at 100.00%

read 675 pkts (for a total of 143959 bytes). max packet length =
1518 bytes.

-> Needed MBUF size: 1648

-> Needed number of MBUFs: 675

-> Needed Memory = 1.061 MB

-> Needed Hugepages of 1 GB = 1

-> Needed CPUs: 1

-> Create mempool of 675 mbufs of 1648 octets.

-> Will cache 675 pkts on 1 caches.

What does this 'cache' stand for? Does it refer to the mempool
per-lcore cache?
If so, please note that, according to API [2] documentation, cache
size "must be lower or equal to RTE_MEMPOOL_CACHE_MAX_SIZE and n /
1.5", where 'n' stands for the number of mbufs. Also, documentation
says it is advised to choose cache_size to have "n modulo cache_size
== 0". Does your code meet these requirements?

By the looks of it, it doesn't (cache_size = n = 675). Consider to
double-check.

[2]
https://doc/
.dpdk.org%2Fapi-25.03%2Frte__mempool_8h.html%23a0b64d611bc140a4d2a0c
9
4911580efd5&data=05%7C02%7CKR.Gokul%40in.bosch.com%7C53a20884cad14b9
4
7a0008ddc9aff5bf%7C0ae51e1907c84e4bbb6d648ee58410f4%7C0%7C0%7C638888
4
79792843977%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIw
L
jAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7
C
%7C&sdata=VLPTrAXqY2FNmhA6mwLFEZgc6f4LFc7oa%2BUb8DrmtWs%3D&reserved=
0

___________________________________________________________________
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___________________________________________________________________
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Issue:
Despite successful parsing of the pcap file and proper
initialization, no frames were transmitted or received on either
the sender or receiver sides.

Is this observation based solely on watching APIs [3] and [4] return
0 all the time? If yes, one can consider to introduce invocations of
APIs [5], [6] and [7] in order to periodically poll and print
statistics (may be with 1-second delay), which may, for example,
shed light on mbuf allocation errors (extended stats).

Do statistics display any interesting figures to be discussed?

[3]
https://doc/
.dpdk.org%2Fapi-25.03%2Frte__ethdev_8h.html%23a3e7d76a451b46348686ea
9
7d6367f102&data=05%7C02%7CKR.Gokul%40in.bosch.com%7C53a20884cad14b94
7
a0008ddc9aff5bf%7C0ae51e1907c84e4bbb6d648ee58410f4%7C0%7C0%7C6388884
7
9792853601%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwL
j
AuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C
%
7C&sdata=56BbJeMo6BtewrRGcnIIWBx4gxbvQKl7iATnoUpcTMc%3D&reserved=0
[4]
https://doc/
.dpdk.org%2Fapi-25.03%2Frte__ethdev_8h.html%23a83e56cabbd31637efd648
e
3fc010392b&data=05%7C02%7CKR.Gokul%40in.bosch.com%7C53a20884cad14b94
7
a0008ddc9aff5bf%7C0ae51e1907c84e4bbb6d648ee58410f4%7C0%7C0%7C6388884
7
9792862833%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwL
j
AuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C
%
7C&sdata=bDP8uNF03zuftWy%2BRbXKg1sYwv8DruMG53ntffCy%2BOk%3D&reserved
=
0

[5]
https://doc/
.dpdk.org%2Fapi-25.03%2Frte__ethdev_8h.html%23adec226574c53ae413252c
9
b15f6f4bab&data=05%7C02%7CKR.Gokul%40in.bosch.com%7C53a20884cad14b94
7
a0008ddc9aff5bf%7C0ae51e1907c84e4bbb6d648ee58410f4%7C0%7C0%7C6388884
7
9792872496%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwL
j
AuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C
%
7C&sdata=dJ3yB2MTz28n2mQ5ogbYilcj4sr7K2JD723k5zWvlyU%3D&reserved=0
[6]
https://doc/
.dpdk.org%2Fapi-25.03%2Frte__ethdev_8h.html%23a418ad970673eb17167318
5
e36044fd79&data=05%7C02%7CKR.Gokul%40in.bosch.com%7C53a20884cad14b94
7
a0008ddc9aff5bf%7C0ae51e1907c84e4bbb6d648ee58410f4%7C0%7C0%7C6388884
7
9792882662%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwL
j
AuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C
%
7C&sdata=aFt%2Fn%2B4FqX6cJDxWVRyWlZrAlVPXOqE6jV7Uymq7WQw%3D&reserved
=
0
[7]
https://doc/
.dpdk.org%2Fapi-25.03%2Frte__ethdev_8h.html%23a300d75b583c1f5acfe5b1
6
2a5d8c0ac1&data=05%7C02%7CKR.Gokul%40in.bosch.com%7C53a20884cad14b94
7
a0008ddc9aff5bf%7C0ae51e1907c84e4bbb6d648ee58410f4%7C0%7C0%7C6388884
7
9792892124%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwL
j
AuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C
%
7C&sdata=TlmU3IaIKCzOEvsmFn8if%2BftgQq7ZJCuzcs6x%2B8jaAY%3D&reserved
=
0

___________________________________________________________________
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___________________________________________________________________
_ __ ______________________________________________


Environment Details:

 *  NIC used: Intel I225/I210
 *  Hugepages configured: 1 GB
 *  NUMA binding: --cpunodebind=0 --membind=0
 *  OS: [Your Linux distribution, e.g., Ubuntu 20.04]
 *  DPDK version: [Mention if known]

___________________________________________________________________
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Could you please advise if any additional setup, configuration, or
known limitations may be impacting the packet transmission?

This may be a wild suggestion from my side, but it pays to check
whether link status is "up" upon port start on both ends. One can
use API [8] to do that.

[8]
https://doc/
.dpdk.org%2Fapi-25.03%2Frte__ethdev_8h.html%23ac05878578e4fd9ef3551d
2
c1c175ebe7&data=05%7C02%7CKR.Gokul%40in.bosch.com%7C53a20884cad14b94
7
a0008ddc9aff5bf%7C0ae51e1907c84e4bbb6d648ee58410f4%7C0%7C0%7C6388884
7
9792901138%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwL
j
AuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C
%
7C&sdata=kLtuxeh0nYIV7UnU5WGLykXqngpIXzqHNsMlRG%2F89e0%3D&reserved=0

Thank you.

Thank you in advance for your support!


Best regards,
Gokul K R