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<base href="https://bugs.dpdk.org/">
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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 - AVX-512 support disabled"
href="https://bugs.dpdk.org/show_bug.cgi?id=1656">1656</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>AVX-512 support disabled
</td>
</tr>
<tr>
<th>Product</th>
<td>DPDK
</td>
</tr>
<tr>
<th>Version</th>
<td>18.11
</td>
</tr>
<tr>
<th>Hardware</th>
<td>All
</td>
</tr>
<tr>
<th>OS</th>
<td>Other
</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>other
</td>
</tr>
<tr>
<th>Assignee</th>
<td>dev@dpdk.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>nandinipersad361@gmail.com
</td>
</tr>
<tr>
<th>Target Milestone</th>
<td>---
</td>
</tr></table>
<p>
<div class="bz_comment_block">
<pre class="bz_comment_text">AVX-512 support has been disabled on some conditions.
On DPDK v18.11 AVX-512 is disabled for all GCC builds which reported to cause a
performance drop.
On DPDK v19.02 AVX-512 disable scope is reduced to GCC and binutils version
2.30 based on information accrued from the GCC community defect.
Reason:
Generated AVX-512 code cause crash: <a class="bz_bug_link bz_status_RESOLVED bz_closed" title="RESOLVED FIXED - rte_memcpy() moves data incorrectly on Ubuntu 18.04 on Intel Skylake" href="show_bug.cgi?id=97">https://bugs.dpdk.org/show_bug.cgi?id=97</a>
<a href="https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88096">https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88096</a>
Resolution/Workaround:
Update binutils to newer version than 2.30.
OR
Use different compiler, like clang for this case.
Affected Environment/Platform:
GCC and binutils version 2.30.
Driver/Module:
ALL.
</pre>
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