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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 - Can't configure DPDK poller in busy loop to fix drops"
   href="https://bugs.dpdk.org/show_bug.cgi?id=1667">1667</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>Can't configure DPDK poller in busy loop to fix drops
          </td>
        </tr>

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

        <tr>
          <th>Version</th>
          <td>24.11
          </td>
        </tr>

        <tr>
          <th>Hardware</th>
          <td>All
          </td>
        </tr>

        <tr>
          <th>OS</th>
          <td>All
          </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>fgiordano@riverbed.com
          </td>
        </tr>

        <tr>
          <th>Target Milestone</th>
          <td>---
          </td>
        </tr></table>
      <p>
        <div class="bz_comment_block">
          <pre class="bz_comment_text">I have an application where I configure multiple NICs with different PMDs and
then I have a simple poller thread that copies packets out of the descriptors
of configured NICs to dedicated rte_rings (one for each port) using
rte_eth_rx_burst. Other threads will then get packets out of the rings and
process packets on a per-port basis.

This poller is configured to run in realtime mode, with high priority on a
dedicated/isolated CPU. It works well and for example on an Intel X710 it can
process 10Gbps/1.8Mpps.

However, sometimes (like 3-4 times a day), the poller can't keep up and drops a
few packets. I have a sleep in my current configuration so I tried to remove it
and have the poller run in busy loop (since it runs in its own cpu and cpu
usage is not a problem). But if I do so, it starts dropping packets like crazy.
That's counter intuitive to me and I would like to know why that happens.
          </pre>
        </div>
      </p>


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