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    <body><table border="1" cellspacing="0" cellpadding="8" class="bz_new_table">
        <tr>
          <th>Bug ID</th>
          <td><a class="bz_bug_link 
          bz_status_UNCONFIRMED "
   title="UNCONFIRMED - mlx5_tx_handle_completion: bad timestamp"
   href="https://bugs.dpdk.org/show_bug.cgi?id=1200">1200</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>mlx5_tx_handle_completion: bad timestamp
          </td>
        </tr>

        <tr>
          <th>Product</th>
          <td>DPDK
          </td>
        </tr>

        <tr>
          <th>Version</th>
          <td>22.03
          </td>
        </tr>

        <tr>
          <th>Hardware</th>
          <td>x86
          </td>
        </tr>

        <tr>
          <th>OS</th>
          <td>Linux
          </td>
        </tr>

        <tr>
          <th>Status</th>
          <td>UNCONFIRMED
          </td>
        </tr>

        <tr>
          <th>Severity</th>
          <td>normal
          </td>
        </tr>

        <tr>
          <th>Priority</th>
          <td>Normal
          </td>
        </tr>

        <tr>
          <th>Component</th>
          <td>core
          </td>
        </tr>

        <tr>
          <th>Assignee</th>
          <td>dev@dpdk.org
          </td>
        </tr>

        <tr>
          <th>Reporter</th>
          <td>7532yahoo@gmail.com
          </td>
        </tr>

        <tr>
          <th>Target Milestone</th>
          <td>---
          </td>
        </tr></table>
      <p>
        <div class="bz_comment_block">
          <pre class="bz_comment_text">In the file `dpdk/drivers/net/mlx5/mlx5_tx.c` method
`mlx5_tx_handle_completion` I inspect the timestamp field of a cqe:

@@ -192,6 +196,9 @@ mlx5_tx_handle_completion(struct mlx5_txq_data
*__rte_restrict txq,

                cqe = &txq->cqes[txq->cq_ci & txq->cqe_m];
                ret = check_cqe(cqe, txq->cqe_s, txq->cq_ci);
+    if (ret==MLX5_CQE_STATUS_HW_OWN) {
+      printf("line:%d cqe timestamp: %lu\n", __LINE__, cqe->timestamp);
+    }

Consider transmitting several thousand packets. This print to stdout with
regard to the timestamp,

* prints 0 for timestamp for the first ~2000 packet completions
* prints non-zero numbers thereafter, however, not monotonically increasing
e.g. completion event timestamp for occurrence  N is 10x smaller than N-1
          </pre>
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      </p>


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