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        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-26614] Do not round up buffer sizes when receiving Messages</title>
                <link>https://jira.mongodb.org/browse/SERVER-26614</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The MessagePort::recv class &lt;a href=&quot;https://github.com/mongodb/mongo/blob/8794dd4bdcab131a4ecf0963505e7fb2a34bf5e6/src/mongo/util/net/message_port.cpp#L151-L153&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;rounds up the size of the buffer&lt;/a&gt; it uses to hold a message coming off the network.&lt;/p&gt;

&lt;p&gt;There is no good reason to do so, and some reasons to actively not do so, since:&lt;/p&gt;
&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;TCMalloc already groups allocations into size buckets&lt;/li&gt;
	&lt;li&gt;The extra allocation wastes 0.5kb on average for each server operation in progress&lt;/li&gt;
	&lt;li&gt;ASAN and other tools will see the extra bytes as valid to access, even though they contain garbage data, potentially masking bugs.&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;We should remove the rounding.&lt;/p&gt;</description>
                <environment></environment>
        <key id="323380">SERVER-26614</key>
            <summary>Do not round up buffer sizes when receiving Messages</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="andrew.morrow@mongodb.com">Andrew Morrow</assignee>
                                    <reporter username="andrew.morrow@mongodb.com">Andrew Morrow</reporter>
                        <labels>
                            <label>platforms-hocr</label>
                    </labels>
                <created>Thu, 13 Oct 2016 13:21:59 +0000</created>
                <updated>Sat, 19 Nov 2016 00:06:38 +0000</updated>
                            <resolved>Thu, 13 Oct 2016 23:48:56 +0000</resolved>
                                                    <fixVersion>3.4.0-rc1</fixVersion>
                                    <component>Networking</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="1408108" author="xgen-internal-githook" created="Thu, 13 Oct 2016 23:48:47 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;acmorrow&apos;, u&apos;name&apos;: u&apos;Andrew Morrow&apos;, u&apos;email&apos;: u&apos;acm@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-26614&quot; title=&quot;Do not round up buffer sizes when receiving Messages&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-26614&quot;&gt;&lt;del&gt;SERVER-26614&lt;/del&gt;&lt;/a&gt; Clean up memory management in MessagePort::recv&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/91a22832b42c814909feeb6dc18f9f098fdd7313&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/91a22832b42c814909feeb6dc18f9f098fdd7313&lt;/a&gt;&lt;/p&gt;</comment>
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