Worse performance with DPDK driver when MTU is set to 2022 or less

https://bugs.dpdk.org/show_bug.cgi?id=487

            Bug ID: 487
           Summary: Worse performance with DPDK driver when MTU is set to
                    2022 or less
           Product: DPDK
           Version: 20.02
          Hardware: All
                OS: All
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: core
          Assignee: [email protected]
          Reporter: [email protected]

Target Milestone: ---

This is a copy of issue VPP-1876 [0], opened against VPP project. See the description and comments there (or let me know and I will copy them here).

Performance of VPP (NIC: Intel-xxv710) depends on MTU value set, but only when DPDK driver is used. That does not prove the bug is in DPDK, but it is suspicious enough for me to open this Bug against DPDK.

I tried to reproduce the behavior using other DPDK applications, but they tend to hit the line rate regardless of MTU. Is there a DPDK application that intentionally wastes some cycles, so I can try to confirm its performance depends on MTU value?

[0] https://jira.fd.io/browse/VPP-1876

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