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I'm trying to use pktgen now. Do you know which c= ommand should be used to specify the packet size for pktgen? Best Regards, Xu, Chenjie -----Original Message----- From: Van Haaren, Harry =20 Sent: Thursday, July 9, 2020 5:51 PM To: Xu, Chenjie ; users@dpdk.org Subject: RE: [dpdk-users] How to specify packet size of testpmd > -----Original Message----- > From: users On Behalf Of Xu, Chenjie > Sent: Thursday, July 9, 2020 10:26 AM > To: users@dpdk.org > Subject: [dpdk-users] How to specify packet size of testpmd >=20 > Hi all, > Do you know how to specify the packet size when using testpmd to test=20 > the network performance? Hi, Usually, testpmd just forwards the packets it receives. Testpmd itself is n= ot a "proper" traffic generator, but it does have some capabilities to send= some traffic before starting its rx-tx behavior.=20 The command is "start tx_first" and this will by default use a small packet= size. https://doc.dpdk.org/guides/testpmd_app_ug/testpmd_funcs.html#start-tx-firs= t There are a number of more powerful DPDK based traffic generators available= , if you require more features. Examples are pktgen, trex, moongen. Of course, it is also possible to modify a sample application like example/= skeleton to send a specific traffic type, as your particular benchmarking m= ight require. > Best Regards, > Xu, Chenjie Hope that helps, -Harry