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<base href="https://bugs.freedesktop.org/" />
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<th>Priority</th>
<td>medium
</td>
</tr>
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Performance regression from cgroup refactoring makes dense boxes nearly unbootable"
href="https://bugs.freedesktop.org/show_bug.cgi?id=70967">70967</a>
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<th>Assignee</th>
<td>systemd-bugs@lists.freedesktop.org
</td>
</tr>
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<th>Summary</th>
<td>Performance regression from cgroup refactoring makes dense boxes nearly unbootable
</td>
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<th>QA Contact</th>
<td>systemd-bugs@lists.freedesktop.org
</td>
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<th>Severity</th>
<td>critical
</td>
</tr>
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<th>Classification</th>
<td>Unclassified
</td>
</tr>
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<th>OS</th>
<td>Linux (All)
</td>
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<th>Reporter</th>
<td>david@davidstrauss.net
</td>
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<th>Hardware</th>
<td>All
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Version</th>
<td>unspecified
</td>
</tr>
<tr>
<th>Component</th>
<td>general
</td>
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<th>Product</th>
<td>systemd
</td>
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<div>
<pre>Having at least few thousand units can add hours to boot time.
We don't have any firm answers yet, but there's a thread here:
<a href="http://lists.freedesktop.org/archives/systemd-devel/2013-October/013765.html">http://lists.freedesktop.org/archives/systemd-devel/2013-October/013765.html</a>
It looks like the worst case is a Xen VM because of hypervisor memory
management interaction. Like the bottleneck with daemon-reload, key problems
seem to be with hashmap_iterate. We've mostly tested with v208, but the changes
occurred in v205, the first version to ship after Fedora 19.</pre>
</div>
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