Re: [dpdk-users] Can dpdk-pdump capture high speed traffic?

[Stephen Hemminger]

On Tue, 30 Jun 2020 15:33:53 +0800
"Licj" <272465...@qq.com> wrote:

> I have two machines directly connected with Mellanox 56g nice.
> 
> I am running pktgen-dpdk on one machine, and testpmd&amp;dpdk-pdump on the 
> other machine. One is for packet sending and the other is for recving.
> 
> 
> The pktgen and testpmd both show 50Gbps traffic. But the pcap file only show 
> several hundreds Mbps.

The current packet capture has multiple context switches and packet copies.
Also, it is limited by the speed of filesystem writes.