How to configure burst size with trex with Mellanox DPDK driver

[jrey...@gmail.com]

This topic follows the topic "Set parameters to mlx5 DPDK driver when starting TRex".

This is a broader question: is it possible to configure TRex to reduce the burst size? It seems that TRex wants to send traffic by burst of 32 packets.

We tried to look into the source code and to reverse the path with gdb, but it lead us to nothing interesting.

Thanks,

Jérôme

[Yaroslav Brustinov]

Hi,

main_dpdk.cpp:

#define MAX_PKT_BURST 32

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[jrey...@gmail.com]

OK, this was our primary conclusion: the only way to control the burst size is to recompile trex. I will give it a try, and why not make a PR to make this parameter configurable at runtime.

[kang...@pensando.io]

Is there any PR on this? It will be nice to be able to specify additional DPDK parameters. For example, I need to change the txq_inline parameter to see if it will help with PCI back pressure, similar to what I can do with testpmd below by passing txq_inline with the -w option.

./testpmd -c 0x1ff -n 4 -w 0000:08:00.0,txq_inline=128 -w
0000:08:00.1,txq_inline=128 --socket-mem=2048,0 -- --port-numa-
config=0,0,1,0 --socket-num=0 --burst=64 --txd=1024 --rxd=256 --
mbcache=512 --rxq=4 --txq=4 --nb-cores=8 -I

So my current conclusion is I need to recompile Trex and add this parameters in update_dpdk_args. Any other way to do this?

[hanoh haim]

I agree, it is a good idea to add it.

You can open an issue in GitHub 

Thanks

Hanoh

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Hanoh

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[kit...@gmail.com]

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Was there a configuration added for this?

Thanks