First of all, could you try this [1] with latest vpp? It’s really interesting 
that iperf does not exhibit this issue. 

Regarding your config, some observations:
- I see you have configured 4 worker. I would then recommend to use 4 rx-queues 
and 5 tx-queues (main can send packets), as opposed to 2. 
- tcp defaults to cubic, so config can be omitted.
- evt_qs_memfd_seg is not deprecated, so it can be omitted as well
- any particular reason for "set interface rx-mode eth1 polling”? dpdk 
interfaces are in polling mode by default
- you’re using binary api socket "api-socket-name /run/vpp/api.sock”. That 
works, but going forward we’ll slowly deprecate that api. So it’d recommend 
using the app socket api. See for instance [2] for changes needed to session 
stanza and vcl. 


[1] https://gerrit.fd.io/r/c/vpp/+/38529
[2] https://wiki.fd.io/view/VPP/HostStack/LDP/iperf

> On Mar 20, 2023, at 5:50 AM, Chen Weihao <chenwei...@outlook.com> wrote:
> Thanks for your reply.
> I give a more detailed backtrace and config in 
> https://lists.fd.io/g/vpp-dev/message/22731.  
> <https://lists.fd.io/g/vpp-dev/message/22731,>My installation method is to 
> clone vpp from github and make build on Ubuntu 22.04(Kernel version is 
> 5.19),and I use make run for test and make debug for debugging. Yes, I yried 
> to make the server and client are attached to the same vpp instance.I tried 
> the latest version of vpp on github on yesterday, the problem is still exist.
> I am looking forward to your reply.

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