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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-82030] &quot;Illegal instruction&quot; on EL7 Ivy Bridge CPU</title>
                <link>https://jira.mongodb.org/browse/SERVER-82030</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The issue seems similar to: &lt;a href=&quot;https://jira.mongodb.org/browse/MONGOSH-1604&quot; class=&quot;external-link&quot; rel=&quot;nofollow&quot;&gt;https://jira.mongodb.org/browse/MONGOSH-1604&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;Attached is cpuinfo and gdb output of: &lt;font color=&quot;#000000&quot;&gt;gdb -ex run -ex bt -ex &apos;disassemble $rip-100,$rip+100&apos; --batch --args mongod&lt;/font&gt;&lt;/p&gt;


&lt;p&gt;Since we&apos;re running a lot of microservers with this generation of CPUs, the support of it is important to us.&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;</description>
                <environment></environment>
        <key id="2470476">SERVER-82030</key>
            <summary>&quot;Illegal instruction&quot; on EL7 Ivy Bridge CPU</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="9">Done</resolution>
                                        <assignee username="noopur.gupta@mongodb.com">Noopur Gupta</assignee>
                                    <reporter username="tf@doc-cirrus.com">Thomas Fromm</reporter>
                        <labels>
                    </labels>
                <created>Tue, 10 Oct 2023 09:02:38 +0000</created>
                <updated>Mon, 16 Oct 2023 22:20:38 +0000</updated>
                            <resolved>Mon, 16 Oct 2023 22:20:38 +0000</resolved>
                                    <version>5.0.21</version>
                                                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="5774562" author="JIRAUSER1275035" created="Thu, 12 Oct 2023 19:13:47 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=tf%40doc-cirrus.com&quot; class=&quot;user-hover&quot; rel=&quot;tf@doc-cirrus.com&quot;&gt;tf@doc-cirrus.com&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;AVX instructions(Single Instruction/Multiple dataset SIMD) are set of instructions added in the processors which contributes to improving performance. &lt;/p&gt;

&lt;p&gt;AVX (Advanced Vector Extension) requirement was added on MongoDB v5+ since it improves overall mongod performance capabilites.. Since most of the latest CPUs support AVX, MongoDB decided to provide one single support build type with AVX instructions. &lt;/p&gt;

&lt;p&gt;You can also find this helpful post on the Developer forum &lt;a href=&quot;https://www.mongodb.com/community/forums/t/one-more-time-about-mongo-5-cpu-requirements/168858&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://www.mongodb.com/community/forums/t/one-more-time-about-mongo-5-cpu-requirements/168858&lt;/a&gt;.&lt;/p&gt;

&lt;p&gt;Let us know if you have further questions on this. &lt;/p&gt;

&lt;p&gt;Thanks&lt;br/&gt;
Noopur &lt;/p&gt;</comment>
                            <comment id="5770177" author="JIRAUSER1275207" created="Wed, 11 Oct 2023 12:41:04 +0000"  >&lt;p&gt;I thought the lack of avx was only true for the previous microserver generation shipped with G5420, but the problem affects also the current series of HPE Microserve Gen10+ V2 shipped with Pentium G6405.&lt;/p&gt;

&lt;p&gt;So my questions at this point: Which benefits does mongod have from relying on avx that strong?&lt;/p&gt;</comment>
                            <comment id="5766941" author="JIRAUSER1275207" created="Tue, 10 Oct 2023 10:59:38 +0000"  >&lt;p&gt;I noticed a bit late the requirement of AVX inside the documentation: &lt;a href=&quot;https://www.mongodb.com/docs/v5.0/administration/production-notes/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://www.mongodb.com/docs/v5.0/administration/production-notes/&lt;/a&gt;&lt;/p&gt;</comment>
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                <attachments>
                            <attachment id="481832" name="cpuinfo.txt" size="1132" author="tf@doc-cirrus.com" created="Tue, 10 Oct 2023 08:59:41 +0000"/>
                            <attachment id="481831" name="gdb.txt" size="4682" author="tf@doc-cirrus.com" created="Tue, 10 Oct 2023 09:00:38 +0000"/>
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