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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>[SERVER-18989] Test for THP is not accurate</title>
                <link>https://jira.mongodb.org/browse/SERVER-18989</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/master/src/mongo/db/startup_warnings_mongod.cpp#L251-L292&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;MongoDB checks whether THP and THP Defrag are enabled&lt;/a&gt; by checking the contents of files present under the &apos;&lt;tt&gt;/sys/kernel/mm/transparent_hugepage&lt;/tt&gt;&apos; directory.&lt;/p&gt;

&lt;p&gt;There have been reports that these files can still exist and have the relevant configuration set to &apos;&lt;tt&gt;always&lt;/tt&gt;&apos; even if THP has been disabled via the boot-time parameter, as described in the &lt;a href=&quot;http://docs.mongodb.org/manual/tutorial/transparent-huge-pages/#in-boot-time-configuration-preferred for disabling THP/THP Defrag&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;preferred method&lt;/a&gt; in the online documentation.&lt;/p&gt;

&lt;p&gt;Here are some relevant links to RHEL support cases:&lt;/p&gt;
&lt;ol&gt;
	&lt;li&gt;&lt;a href=&quot;https://access.redhat.com/solutions/46111&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;How to use, monitor, and disable transparent hugepages in Red Hat Enterprise Linux 6?&lt;/a&gt; (Note though the test at the end checks for Hugepage support, not &lt;em&gt;Transparent&lt;/em&gt; Hugepage support)&lt;/li&gt;
	&lt;li&gt;&lt;a href=&quot;https://access.redhat.com/solutions/422283&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;Disabling transparent hugepages (THP) on Red Hat Enterprise Linux 6 is not taking effect.&lt;/a&gt;&lt;/li&gt;
&lt;/ol&gt;


&lt;p&gt;Finally, here is what I believe is the reference article for THP support in Linux: &lt;a href=&quot;http://lwn.net/Articles/423592/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;Documentation/vm/transhuge.txt&lt;/a&gt;&lt;/p&gt;</description>
                <environment></environment>
        <key id="210879">SERVER-18989</key>
            <summary>Test for THP is not accurate</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</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="backlog-server-servicearch">Backlog - Service Architecture</assignee>
                                    <reporter username="ronan.bohan@mongodb.com">Ronan Bohan</reporter>
                        <labels>
                            <label>re-triaged-ticket</label>
                    </labels>
                <created>Tue, 16 Jun 2015 10:06:27 +0000</created>
                <updated>Fri, 7 Apr 2023 13:23:21 +0000</updated>
                            <resolved>Thu, 23 Feb 2023 21:53:32 +0000</resolved>
                                                                    <component>Admin</component>
                                        <votes>1</votes>
                                    <watches>6</watches>
                                                                                                                <comments>
                            <comment id="4375728" author="JIRAUSER1262719" created="Thu, 24 Feb 2022 21:56:48 +0000"  >&lt;p&gt;We haven&#8217;t heard back from you for at least one calendar year, so this issue is being closed. If this is still an issue for you, please provide additional information and we will reopen the ticket.&lt;/p&gt;</comment>
                            <comment id="1870249" author="ezekiel@keator.org" created="Fri, 20 Apr 2018 16:52:28 +0000"  >&lt;p&gt;This is still an issue and appears be a duplicate to &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-22257&quot; title=&quot;Remove the THP &amp;quot;defrag&amp;quot; startup warning&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-22257&quot;&gt;SERVER-22257&lt;/a&gt;. This does cause some confusion when disabling THP per Red Hat documentation and still seeing the warning when connecting with MongoDB CLI.&lt;/p&gt;

&lt;h3&gt;&lt;a name=&quot;RedHatDocumentation&quot;&gt;&lt;/a&gt;Red Hat Documentation&lt;/h3&gt;
&lt;p&gt;When transparent_hugepage=never is appended to /boot/grub/grub.conf and the system is rebooted, the /sys/kernel/mm/transparent_hugepage/defrag option may still be enabled (ie: set to always). This can safely be ignored as THP is disabled, and THP defrag will not come into effect:&lt;/p&gt;

&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: #ff1493; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;cat&lt;/span&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt; &lt;/span&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;/sys/kernel/mm/transparent_hugepage/enabled&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;always [never]&lt;/span&gt;&lt;/pre&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&amp;nbsp;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: #ff1493; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;cat&lt;/span&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt; &lt;/span&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;/sys/kernel/mm/transparent_hugepage/defrag&lt;/span&gt;&lt;/pre&gt;
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				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;[always] never&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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&lt;p/&gt;</comment>
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            <issuekey id="259926">SERVER-22257</issuekey>
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            <issuekey id="259926">SERVER-22257</issuekey>
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