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<body><table border="1" cellspacing="0" cellpadding="8" class="bz_new_table">
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<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>
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<th>Version</th>
<td>24.11
</td>
</tr>
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<th>Hardware</th>
<td>All
</td>
</tr>
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<th>OS</th>
<td>All
</td>
</tr>
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<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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