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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>[DRIVERS-802] TCP Fast Open</title>
                <link>https://jira.mongodb.org/browse/DRIVERS-802</link>
                <project id="10980" key="DRIVERS">Drivers</project>
                    <description>    &lt;div class=&quot;panel&quot; style=&quot;background-color: #c2d2c2;border-width: 1px;&quot;&gt;&lt;div class=&quot;panelHeader&quot; style=&quot;border-bottom-width: 1px;background-color: #239eb0;&quot;&gt;&lt;b&gt;Downstream Change Summary&lt;/b&gt;&lt;/div&gt;&lt;div class=&quot;panelContent&quot; style=&quot;background-color: #c2d2c2;&quot;&gt;
&lt;p&gt;    This change enables &quot;TCP Fast Open&quot; (TFO) connections to MongoDB.&lt;/p&gt;

&lt;ul&gt;
	&lt;li&gt;The operating system of both the client and server must have TFO support
	&lt;ul&gt;
		&lt;li&gt;Windows: Server only on Windows 10 or later&lt;/li&gt;
		&lt;li&gt;macOS: Server only on 10.11 or later&lt;/li&gt;
		&lt;li&gt;Linux
		&lt;ul&gt;
			&lt;li&gt;Client: Kernel version &amp;gt;= 4.11, /proc/sys/net/ipv4/tcp_fastopen set to 1 or 3.&lt;/li&gt;
			&lt;li&gt;Server: Kernel version &amp;gt;= 3.7, /proc/sys/net/ipv4/tcp_fastopen set to 2 or 3&lt;/li&gt;
		&lt;/ul&gt;
		&lt;/li&gt;
	&lt;/ul&gt;
	&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;setParameters (these are enabled by default):&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;tcpFastOpenClient - Attempt to make outbound TFO connections&lt;/li&gt;
	&lt;li&gt;tcpFastOpenServer - Accept inbound TFO connection attempts&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;Additionally the following setParameter may be tuned on the server:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;tcpFastOpenQueueSize (default 1024)&lt;/li&gt;
&lt;/ul&gt;
&lt;/div&gt;&lt;/div&gt;

&lt;h2&gt;&lt;a name=&quot;DescriptionofLinkedTicket&quot;&gt;&lt;/a&gt;Description of Linked Ticket&lt;/h2&gt;
&lt;p&gt;    We should investigate what work needs to be done to perform TCP Fast Open when speaking to other hosts.&lt;/p&gt;
</description>
                <environment></environment>
        <key id="1065211">DRIVERS-802</key>
            <summary>TCP Fast Open</summary>
                <type id="11" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14707&amp;avatarType=issuetype">Epic</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="12300">Won&apos;t Do</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="backlog-server-pm">Backlog - Core Eng Program Management Team</reporter>
                        <labels>
                    </labels>
                <created>Mon, 23 Dec 2019 19:16:15 +0000</created>
                <updated>Mon, 10 Oct 2022 14:23:47 +0000</updated>
                            <resolved>Tue, 20 Sep 2022 16:28:15 +0000</resolved>
                                                                            <votes>0</votes>
                                    <watches>6</watches>
                                                                                                                <comments>
                            <comment id="2766084" author="esha.bhargava" created="Mon, 27 Jan 2020 17:52:40 +0000"  >&lt;p&gt;We can investigate this post 4.4&lt;/p&gt;</comment>
                    </comments>
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                            <customfieldvalue>&lt;p&gt;This change enables &quot;TCP Fast Open&quot; (TFO) connections to MongoDB.&lt;/p&gt;

&lt;ul&gt;
	&lt;li&gt;The operating system of both the client and server must have TFO support
	&lt;ul&gt;
		&lt;li&gt;Windows: Server only on Windows 10 or later&lt;/li&gt;
		&lt;li&gt;macOS: Server only on 10.11 or later&lt;/li&gt;
		&lt;li&gt;Linux
		&lt;ul&gt;
			&lt;li&gt;Client: Kernel version &amp;gt;= 4.11, /proc/sys/net/ipv4/tcp_fastopen set to 1 or 3.&lt;/li&gt;
			&lt;li&gt;Server: Kernel version &amp;gt;= 3.7, /proc/sys/net/ipv4/tcp_fastopen set to 2 or 3&lt;/li&gt;
		&lt;/ul&gt;
		&lt;/li&gt;
	&lt;/ul&gt;
	&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;setParameters (these are enabled by default):&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;tcpFastOpenClient - Attempt to make outbound TFO connections&lt;/li&gt;
	&lt;li&gt;tcpFastOpenServer - Accept inbound TFO connection attempts&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;Additionally the following setParameter may be tuned on the server:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;tcpFastOpenQueueSize (default 1024).&lt;/li&gt;
&lt;/ul&gt;
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