2% single core packet forwarding performance degradation

https://bugs.dpdk.org/show_bug.cgi?id=916

            Bug ID: 916
           Summary: [20.11.4-rc1][mlx5] 2% single core packet forwarding
                    performance degradation
           Product: DPDK
           Version: 20.11
          Hardware: All
                OS: All
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: ethdev
          Assignee: [email protected]
          Reporter: [email protected]

Target Milestone: ---

The patch d95c7a669d03 ("mbuf: fix reset on mbuf free") is causing a ~2% performance regression in 20.11.4-rc1 (50.3 -> 49 mpps).

Testpmd command: build/app/dpdk-testpmd -n 4 -a 0000:82:00.0 -a 0000:82:00.1 -c 0x9000 -- -i --nb-cores=1 --txd=256 --rxd=256 --auto-start
Traffic generator used is TREX with traffic pattern (Ether / IP / UDP).

OS: Ubuntu 18.04
NIC: ConnectX-5
MLNX_OFED: MLNX_OFED_LINUX-5.4-3.1.0.0
FW: 16.31.2006

See this thread:
https://inbox.dpdk.org/dev/DM4PR12MB51675B979CBD86C74394BF74DAAA9@DM4PR12MB5167.namprd12.prod.outlook.com/

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