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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-54684] Decreased JS performance on arm64 due to mising init function</title>
                <link>https://jira.mongodb.org/browse/SERVER-54684</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;This bug is in mozjs(firefox) esr-60.&lt;/p&gt;

&lt;p&gt;The function &lt;tt&gt;vixl::CPU::SetUp()&lt;/tt&gt; is never called. As a result, on arm64 MozJS will clear instruction cache separately for each byte, greatly impacting JS performance. This is especially important on Graviton2 processors, where advanced kernels expose instruction cacheline size of a full page (usually, 4KB) &lt;/p&gt;

&lt;p&gt;In firefox esr 68, the &lt;tt&gt;SetUp&lt;/tt&gt; function is called from &lt;tt&gt;js::jit::InitProcessExecutableMemory&lt;/tt&gt;.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1629185">SERVER-54684</key>
            <summary>Decreased JS performance on arm64 due to mising init function</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="13201">Fixed</resolution>
                                        <assignee username="andrew.morrow@mongodb.com">Andrew Morrow</assignee>
                                    <reporter username="tsahee@amazon.com">Tsahi Zidenberg</reporter>
                        <labels>
                    </labels>
                <created>Sun, 21 Feb 2021 09:00:34 +0000</created>
                <updated>Sun, 29 Oct 2023 21:57:13 +0000</updated>
                            <resolved>Wed, 24 Feb 2021 18:59:36 +0000</resolved>
                                                    <fixVersion>4.9.0</fixVersion>
                    <fixVersion>4.2.13</fixVersion>
                    <fixVersion>4.4.5</fixVersion>
                                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="3637618" author="xgen-internal-githook" created="Fri, 26 Feb 2021 18:54:18 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Andrew Morrow&apos;, &apos;email&apos;: &apos;acm@mongodb.com&apos;, &apos;username&apos;: &apos;acmorrow&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-54684&quot; title=&quot;Decreased JS performance on arm64 due to mising init function&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-54684&quot;&gt;&lt;del&gt;SERVER-54684&lt;/del&gt;&lt;/a&gt; Apply upstream fix for MozJS bug 1442583&lt;/p&gt;

&lt;p&gt;Please see &lt;a href=&quot;https://bugzilla.mozilla.org/show_bug.cgi?id=1442583&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://bugzilla.mozilla.org/show_bug.cgi?id=1442583&lt;/a&gt; for&lt;br/&gt;
the upstream bug. The patch applied here was derived from the&lt;br/&gt;
following commit:&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://github.com/mozilla/gecko-dev/commit/7371a080accd8dfcaf0d24072b787e143846973a&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mozilla/gecko-dev/commit/7371a080accd8dfcaf0d24072b787e143846973a&lt;/a&gt;&lt;br/&gt;
(cherry picked from commit 25d0ab84369a09112978d399ccc09b55b7009023)&lt;br/&gt;
(cherry picked from commit 775f2dfe30552cb2b808bcc320021c01eb5bb518)&lt;br/&gt;
Branch: v4.2&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/16e8cfc7eec8d270e328f4162accb23def2e25a5&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/16e8cfc7eec8d270e328f4162accb23def2e25a5&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3637531" author="xgen-internal-githook" created="Fri, 26 Feb 2021 18:14:01 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Andrew Morrow&apos;, &apos;email&apos;: &apos;acm@mongodb.com&apos;, &apos;username&apos;: &apos;acmorrow&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-54684&quot; title=&quot;Decreased JS performance on arm64 due to mising init function&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-54684&quot;&gt;&lt;del&gt;SERVER-54684&lt;/del&gt;&lt;/a&gt; Apply upstream fix for MozJS bug 1442583&lt;/p&gt;

&lt;p&gt;Please see &lt;a href=&quot;https://bugzilla.mozilla.org/show_bug.cgi?id=1442583&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://bugzilla.mozilla.org/show_bug.cgi?id=1442583&lt;/a&gt; for&lt;br/&gt;
the upstream bug. The patch applied here was derived from the&lt;br/&gt;
following commit:&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://github.com/mozilla/gecko-dev/commit/7371a080accd8dfcaf0d24072b787e143846973a&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mozilla/gecko-dev/commit/7371a080accd8dfcaf0d24072b787e143846973a&lt;/a&gt;&lt;br/&gt;
(cherry picked from commit 25d0ab84369a09112978d399ccc09b55b7009023)&lt;br/&gt;
Branch: v4.4&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/775f2dfe30552cb2b808bcc320021c01eb5bb518&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/775f2dfe30552cb2b808bcc320021c01eb5bb518&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3633403" author="xgen-internal-githook" created="Wed, 24 Feb 2021 18:58:29 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Andrew Morrow&apos;, &apos;email&apos;: &apos;acm@mongodb.com&apos;, &apos;username&apos;: &apos;acmorrow&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-54684&quot; title=&quot;Decreased JS performance on arm64 due to mising init function&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-54684&quot;&gt;&lt;del&gt;SERVER-54684&lt;/del&gt;&lt;/a&gt; Apply upstream fix for MozJS bug 1442583&lt;/p&gt;

&lt;p&gt;Please see &lt;a href=&quot;https://bugzilla.mozilla.org/show_bug.cgi?id=1442583&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://bugzilla.mozilla.org/show_bug.cgi?id=1442583&lt;/a&gt; for&lt;br/&gt;
the upstream bug. The patch applied here was derived from the&lt;br/&gt;
following commit:&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://github.com/mozilla/gecko-dev/commit/7371a080accd8dfcaf0d24072b787e143846973a&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mozilla/gecko-dev/commit/7371a080accd8dfcaf0d24072b787e143846973a&lt;/a&gt;&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/25d0ab84369a09112978d399ccc09b55b7009023&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/25d0ab84369a09112978d399ccc09b55b7009023&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3626690" author="JIRAUSER1258318" created="Sun, 21 Feb 2021 13:52:35 +0000"  >&lt;p&gt;I don&apos;t know the MozJs ticket.. but here is the commit: &lt;a href=&quot;https://github.com/mozilla/gecko-dev/commit/7371a080accd8dfcaf0d24072b787e143846973a&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mozilla/gecko-dev/commit/7371a080accd8dfcaf0d24072b787e143846973a&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;</comment>
                            <comment id="3626687" author="acm" created="Sun, 21 Feb 2021 13:32:17 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=tsahee%40amazon.com&quot; class=&quot;user-hover&quot; rel=&quot;tsahee@amazon.com&quot;&gt;tsahee@amazon.com&lt;/a&gt; - That&apos;s fascinating. Is there a MozJS ticket for this issue? Generally we like to inspect the MozJS fix for such an issue and attempt to cherry-pick it back into our vendored MozJS sources if possible.&lt;/p&gt;</comment>
                            <comment id="3626645" author="JIRAUSER1258318" created="Sun, 21 Feb 2021 09:35:34 +0000"  >&lt;p&gt;As an aside:&lt;/p&gt;

&lt;p&gt;Graviton2 shows a huge instruction cacheline size due to this workaround: &lt;a href=&quot;https://lore.kernel.org/linux-arm-kernel/bad51442-adba-8b21-0eb2-8d1665c71524@arm.com/T/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://lore.kernel.org/linux-arm-kernel/bad51442-adba-8b21-0eb2-8d1665c71524@arm.com/T/&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;</comment>
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