Hi, First of all, could you try this  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  for changes needed to session stanza and vcl. Regards, Florin  https://gerrit.fd.io/r/c/vpp/+/38529  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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