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    <title>MongoDB Jira</title>
    <link>https://jira.mongodb.org</link>
    <description>This file is an XML representation of an issue</description>
    <language>en-us</language>    <build-info>
        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[DOCS-5108] Comment on: &quot;manual/reference/transparent-huge-pages.txt&quot;</title>
                <link>https://jira.mongodb.org/browse/DOCS-5108</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>&lt;p&gt;Hi,&lt;/p&gt;

&lt;p&gt;As we can see here, there is now a double check on Transparent Huge Page:&lt;br/&gt;
&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-16643?focusedCommentId=805628&amp;amp;page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-805628&quot; class=&quot;external-link&quot; rel=&quot;nofollow&quot;&gt;https://jira.mongodb.org/browse/SERVER-16643?focusedCommentId=805628&amp;amp;page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-805628&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;But When I use the &apos;In boot Time Configuration&apos; suggestion, only transparent_hugepage/enable is set to never &lt;/p&gt;

&lt;p&gt;From Transparent Huge Page documentation :&lt;/p&gt;

&lt;p&gt;== Boot parameter ==&lt;/p&gt;

&lt;p&gt;You can change the sysfs boot time defaults of Transparent Hugepage&lt;br/&gt;
Support by passing the parameter &quot;transparent_hugepage=always&quot; or&lt;br/&gt;
&quot;transparent_hugepage=madvise&quot; or &quot;transparent_hugepage=never&quot;&lt;br/&gt;
(without &quot;&quot;) to the kernel command line.&lt;br/&gt;
&lt;a href=&quot;https://www.kernel.org/doc/Documentation/vm/transhuge.txt&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://www.kernel.org/doc/Documentation/vm/transhuge.txt&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;Because of that I still got a warning when running mongo on transparent_hugepage/defrag. Because of that, I think either the first solution is incomplete, or not adequate.&lt;/p&gt;

&lt;p&gt;Thank&apos;s for reading !&lt;/p&gt;
</description>
                <environment>Linux mint debian edition&lt;br/&gt;
uname -a :&lt;br/&gt;
3.11-2-amd64 #1 SMP Debian 3.11.8-1 (2013-11-13) x86_64 GNU/Linux&lt;br/&gt;
&lt;br/&gt;
*Location*: &lt;a href=&quot;http://docs.mongodb.org/manual/reference/transparent-huge-pages/&quot;&gt;http://docs.mongodb.org/manual/reference/transparent-huge-pages/&lt;/a&gt;&lt;br/&gt;
*User-Agent*: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/42.0.2311.50 Safari/537.36&lt;br/&gt;
*Referrer*: &lt;a href=&quot;http://docs.mongodb.org/manual/administration/production-notes/&quot;&gt;http://docs.mongodb.org/manual/administration/production-notes/&lt;/a&gt;&lt;br/&gt;
*Screen Resolution*: 1920 x 1080&lt;br/&gt;
*repo*: docs&lt;br/&gt;
*source*: reference/transparent-huge-pages&lt;br/&gt;
</environment>
        <key id="192029">DOCS-5108</key>
            <summary>Comment on: &quot;manual/reference/transparent-huge-pages.txt&quot;</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</type>
                                            <priority id="3" iconUrl="https://jira.mongodb.org/images/icons/priorities/major.svg">Major - P3</priority>
                        <status id="6" iconUrl="https://jira.mongodb.org/images/icons/statuses/closed.png" description="The issue is considered finished, the resolution is correct. Issues which are closed can be reopened.">Closed</status>
                    <statusCategory id="3" key="done" colorName="success"/>
                                    <resolution id="3">Duplicate</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="xgen-internal-docs">Docs Collector User</reporter>
                        <labels>
                            <label>collector-298ba4e7</label>
                    </labels>
                <created>Wed, 25 Mar 2015 21:20:20 +0000</created>
                <updated>Wed, 11 Jan 2017 22:31:26 +0000</updated>
                            <resolved>Fri, 7 Aug 2015 19:03:50 +0000</resolved>
                                                    <fixVersion>01112017-cleanup</fixVersion>
                                        <due></due>
                            <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="1338466" author="emily.hall" created="Wed, 27 Jul 2016 19:10:28 +0000"  >&lt;p&gt;Closed for housekeeping on 7/27/2016 by Emily Hall. &lt;br/&gt;
If you require additional support, please open a new ticket for prioritization. &lt;br/&gt;
Thanks,&lt;br/&gt;
Emily&lt;/p&gt;</comment>
                            <comment id="999709" author="kay.kim@10gen.com" created="Fri, 7 Aug 2015 19:03:50 +0000"  >&lt;p&gt;Duplicate of &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-5330&quot; title=&quot;Using /etc/rc.local to disable THP results in spurious startup warning&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-5330&quot;&gt;&lt;del&gt;DOCS-5330&lt;/del&gt;&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="904959" author="maxpolk" created="Tue, 5 May 2015 03:39:19 +0000"  >&lt;p&gt;Verified that the defrag is examined without regard to the enabled:&lt;/p&gt;

&lt;p&gt;$  cat /sys/kernel/mm/transparent_hugepage/enabled&lt;br/&gt;
always madvise &lt;span class=&quot;error&quot;&gt;&amp;#91;never&amp;#93;&lt;/span&gt;&lt;br/&gt;
$ cat /sys/kernel/mm/transparent_hugepage/defrag&lt;br/&gt;
&lt;span class=&quot;error&quot;&gt;&amp;#91;always&amp;#93;&lt;/span&gt; madvise never&lt;br/&gt;
$ service mongod start&lt;br/&gt;
... (in log) WARNING: /sys/kernel/mm/transparent_hugepage/defrag is &apos;always&apos;&lt;br/&gt;
$ echo &apos;never&apos; &amp;gt; /sys/kernel/mm/transparent_hugepage/defrag&lt;br/&gt;
$ cat /sys/kernel/mm/transparent_hugepage/defrag&lt;br/&gt;
always madvise &lt;span class=&quot;error&quot;&gt;&amp;#91;never&amp;#93;&lt;/span&gt;&lt;br/&gt;
$ service mongod stop&lt;br/&gt;
$ service mongod start&lt;br/&gt;
... (no warning in log)&lt;/p&gt;

&lt;p&gt;Therefore, the fix to this bug is to first look at transparent_hugepage/enabled, and if it is never, don&apos;t bother looking at the irrelevant transparent_hugepage/defrag setting.&lt;/p&gt;</comment>
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