[DPDK/testpmd Bug 1777] --max-pkt-len below 1500 does not seem to to be enforced

bugzilla at dpdk.org bugzilla at dpdk.org
Thu Aug 21 04:44:11 CEST 2025


https://bugs.dpdk.org/show_bug.cgi?id=1777

            Bug ID: 1777
           Summary: --max-pkt-len below 1500 does not seem to to be
                    enforced
           Product: DPDK
           Version: 22.11
          Hardware: x86
                OS: Linux
            Status: UNCONFIRMED
          Severity: minor
          Priority: Normal
         Component: testpmd
          Assignee: dev at dpdk.org
          Reporter: canary.overflow at gmail.com
  Target Milestone: ---

I observed that setting --max-pkt-len to a value lower than 1500 does not
enforce this value even though "show port info X" showed that the MTU was set
to the value passed in.

(e.g. packets larger than 800 bytes (> 1000 bytes) were still observed even
though --max-pkt-len=800 was set)

I believe that there is a default value that --max-pkt-len falls back on if the
value is too low. If this is the case, this value should also be reflected in
the port info.

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