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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-16643] extend existing THP warning to THP defrag setting</title>
                <link>https://jira.mongodb.org/browse/SERVER-16643</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;We currently check certain system parameters at start-up including high read-ahead and transparent huge pages.   &lt;/p&gt;

&lt;p&gt;It turns out even if THP are disabled (enabled set to &lt;span class=&quot;error&quot;&gt;&amp;#91;never&amp;#93;&lt;/span&gt;) if defrag is &quot;always&quot; then it impacts mongod when Linux defrags the pages.   We should extend the check and the warning to &lt;tt&gt;/sys/kernel/mm/transparent_hugepage/defrag&lt;/tt&gt;&lt;/p&gt;</description>
                <environment></environment>
        <key id="175936">SERVER-16643</key>
            <summary>extend existing THP warning to THP defrag setting</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="9">Done</resolution>
                                        <assignee username="benety.goh@mongodb.com">Benety Goh</assignee>
                                    <reporter username="asya.kamsky@mongodb.com">Asya Kamsky</reporter>
                        <labels>
                    </labels>
                <created>Tue, 23 Dec 2014 15:42:28 +0000</created>
                <updated>Wed, 5 Sep 2018 14:34:44 +0000</updated>
                            <resolved>Thu, 15 Jan 2015 18:53:57 +0000</resolved>
                                    <version>2.8.0-rc3</version>
                                    <fixVersion>3.0.0-rc6</fixVersion>
                                    <component>Admin</component>
                    <component>Performance</component>
                                        <votes>0</votes>
                                    <watches>8</watches>
                                                                                                                <comments>
                            <comment id="805628" author="xgen-internal-githook" created="Thu, 15 Jan 2015 18:53:16 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;benety&apos;, u&apos;name&apos;: u&apos;Benety Goh&apos;, u&apos;email&apos;: u&apos;benety@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-16643&quot; title=&quot;extend existing THP warning to THP defrag setting&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-16643&quot;&gt;&lt;del&gt;SERVER-16643&lt;/del&gt;&lt;/a&gt; extend linux transparent huge pages to include &apos;defrag&apos; parameter.&lt;/p&gt;

&lt;p&gt;At startup under Linux, mongod will check the following files:&lt;/p&gt;

&lt;p&gt;/sys/kernel/mm/transparent_hugepage/enabled&lt;br/&gt;
/sys/kernel/mm/transparent_hugepage/defrag&lt;/p&gt;

&lt;p&gt;and produce a warning if either of these parameters are set to &lt;span class=&quot;error&quot;&gt;&amp;#91;always&amp;#93;&lt;/span&gt;.&lt;/p&gt;

&lt;p&gt;The recommended setting is &lt;span class=&quot;error&quot;&gt;&amp;#91;never&amp;#93;&lt;/span&gt; for both parameters. See:&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;http://docs.mongodb.org/manual/administration/production-notes/#recommended-configuration&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://docs.mongodb.org/manual/administration/production-notes/#recommended-configuration&lt;/a&gt;&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/6437d63b9dbd5c80295f54a2b6b8af4638051991&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/6437d63b9dbd5c80295f54a2b6b8af4638051991&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="793375" author="dan@10gen.com" created="Tue, 23 Dec 2014 22:06:36 +0000"  >&lt;p&gt;It was found that this setting has a large impact on some workloads as seen in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-16269&quot; title=&quot;WiredTiger blocks queries and updates for many seconds.&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-16269&quot;&gt;&lt;del&gt;SERVER-16269&lt;/del&gt;&lt;/a&gt;.&lt;/p&gt;</comment>
                    </comments>
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                                            <outwardlinks description="depends on">
                                        <issuelink>
            <issuekey id="129327">SERVER-13482</issuekey>
        </issuelink>
                            </outwardlinks>
                                                        </issuelinktype>
                            <issuelinktype id="10012">
                    <name>Related</name>
                                            <outwardlinks description="related to">
                                        <issuelink>
            <issuekey id="180617">SERVER-17036</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="342889">SERVER-27588</issuekey>
        </issuelink>
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                                                                <inwardlinks description="is related to">
                                        <issuelink>
            <issuekey id="170663">SERVER-16269</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="188473">SERVER-17522</issuekey>
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