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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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            <title>[CDRIVER-532] vectorized writes are pathological for TLS using BIO_write</title>
                <link>https://jira.mongodb.org/browse/CDRIVER-532</link>
                <project id="10030" key="CDRIVER">C Driver</project>
                    <description>&lt;p&gt;The mongoc_stream_writev api is somewhat pathological for TLS streams at this point, because we make multiple calls into BIO_write, which adds overhead in the driver, over the wire and in the server.&lt;/p&gt;

&lt;p&gt;We should coalesce small writes to avoid this penalty&lt;/p&gt;</description>
                <environment></environment>
        <key id="184942">CDRIVER-532</key>
            <summary>vectorized writes are pathological for TLS using BIO_write</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="mira.carey@mongodb.com">Mira Carey</assignee>
                                    <reporter username="mira.carey@mongodb.com">Mira Carey</reporter>
                        <labels>
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                <created>Wed, 18 Feb 2015 18:26:56 +0000</created>
                <updated>Wed, 19 Oct 2016 22:33:18 +0000</updated>
                            <resolved>Tue, 10 Mar 2015 19:21:58 +0000</resolved>
                                    <version>1.1.0</version>
                                    <fixVersion>1.1.2</fixVersion>
                                                        <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="832722" author="xgen-internal-githook" created="Thu, 19 Feb 2015 16:05:02 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;hanumantmk&apos;, u&apos;name&apos;: u&apos;Jason Carey (hanumantmk)&apos;, u&apos;email&apos;: u&apos;jcarey@argv.me&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/CDRIVER-532&quot; title=&quot;vectorized writes are pathological for TLS using BIO_write&quot; class=&quot;issue-link&quot; data-issue-key=&quot;CDRIVER-532&quot;&gt;&lt;del&gt;CDRIVER-532&lt;/del&gt;&lt;/a&gt; - Coalesce small vectorized TLS writes&lt;/p&gt;

&lt;p&gt;Rather than calling BIO_write multiple times for each iovec_t in a call&lt;br/&gt;
to mongoc_stream_tls_writev(), buffer them and send them all at once.&lt;br/&gt;
Attempt to &quot;do the right thing&quot;tm, when buffering provides no&lt;br/&gt;
performance benefit.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo-c-driver/commit/4ebba3d84286df3867bad89358eb6ae956e62a59&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo-c-driver/commit/4ebba3d84286df3867bad89358eb6ae956e62a59&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="831941" author="jason.carey" created="Wed, 18 Feb 2015 18:35:50 +0000"  >&lt;p&gt;&lt;a href=&quot;https://github.com/mongodb/mongo-c-driver/pull/174&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo-c-driver/pull/174&lt;/a&gt;&lt;/p&gt;</comment>
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            <issuekey id="204014">PHPC-298</issuekey>
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