Re: Performance "problem" or how to get power of the DPDK

[Dmitry Kozlyuk <dmitry.kozliuk@gmail.com>]

Hi,

2022-12-26 15:20 (UTC+0300), Ruslan R. Laishev:
> I studying programming with DPDK SDK . So I write a small app to send/receive packets , now I testing it and see next situation:
> iperf3 show  9,4 - 9,7 Gbps on TCP
>  
> my app can *send* only at 4+Gbps (I see counters in the rte_eth_stats) .  I have tried to speed-up my app by:
> -  using 1+ number of TX queues (device claim support 64)
> -  increase size of burst from 32 up to 128  
> - turn off any offloads related to checksumming
>  
> No effect.

Please tell more about what your app does and how (w.r.t. DPDK usage).
Are you sure that all cores are loaded? E.g. if you send identical packets,
RSS can steer them all to a single queue and thus a single core.

What performance do you see using testpmd with txonly/rxonly forward mode,
if applicable?

What is the packet performance, i.e. Mpps, not Gbps, and packet size?
Unless you do TCP payload processing (or compute large payload checksums),
packets per second usually matter rather than bits per second.