This is a share of onload AF_XDP performance (latency and throughput), not an issue.

[h2cw2l]

This data is tested by EF_AF_XDP_ZEROCOPY not set, when sen EF_AF_XDP_ZEROCOPY, the performance is very low.
This test is about TCP.
In most scenarios，there are TCP long pkts，but the performance of onload is obviously lower than linux kernel.

NIC:
[root@A03-R05-I139-66-FVP3HP2 onload]# ethtool -i eth0
driver: ixgbe
version: 5.1.0-k-rh8.2.0
firmware-version: 0x8000090c, 18.3.6
expansion-rom-version:
bus-info: 0000:01:00.0
supports-statistics: yes
supports-test: yes
supports-eeprom-access: yes
supports-register-dump: yes
supports-priv-flags: yes

OS:
[root@A03-R05-I139-66-FVP3HP2 onload]# cat /etc/centos-release
CentOS Linux release 8.2.2004 (Core)
[root@A03-R05-I139-66-FVP3HP2 onload]# uname -a
Linux A03-R05-I139-66-FVP3HP2.JD.LOCAL 4.18.0-240.10.1.el8_3.x86_64 #1 SMP Mon Jan 18 17:05:51 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux
[root@A03-R05-I139-66-FVP3HP2 onload]#