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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-25853] SLES 11 kernel does not support s390x vx instructions</title>
                <link>https://jira.mongodb.org/browse/SERVER-25853</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;On SLES 11, the VX instructions are not supported. Support for this was added in 3.18: &lt;a href=&quot;https://github.com/torvalds/linux/commit/80703617&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/torvalds/linux/commit/80703617&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;&lt;ins&gt;Kernel Version:&lt;/ins&gt; &lt;tt&gt;Linux sles11-z-2 3.0.101-68-default&lt;/tt&gt;&lt;/p&gt;
&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
		&lt;tbody &gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&amp;gt; cat /proc/cpuinfo&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;vendor_id       : IBM/S390&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;# processors    : 4&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;bogomips per cpu: 20325.00&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;features        : esan3 zarch stfle msa ldisp eimm dfp etf3eh highgprs&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;processor 0: version = FF,  identification = 046A77,  machine = 2964&lt;/span&gt;&lt;/pre&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;processor 2: version = FF,  identification = 046A77,  machine = 2964&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;processor 3: version = FF,  identification = 046A77,  machine = 2964&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;</description>
                <environment></environment>
        <key id="312528">SERVER-25853</key>
            <summary>SLES 11 kernel does not support s390x vx instructions</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="mark.benvenuto@mongodb.com">Mark Benvenuto</assignee>
                                    <reporter username="mark.benvenuto@mongodb.com">Mark Benvenuto</reporter>
                        <labels>
                    </labels>
                <created>Mon, 29 Aug 2016 18:13:30 +0000</created>
                <updated>Thu, 9 Feb 2017 19:43:10 +0000</updated>
                            <resolved>Mon, 29 Aug 2016 21:54:39 +0000</resolved>
                                                    <fixVersion>3.3.12</fixVersion>
                                    <component>Build</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="1371952" author="mark.benvenuto" created="Tue, 30 Aug 2016 15:31:26 +0000"  >&lt;p&gt;For documentation purposes:&lt;br/&gt;
SLES 11&apos;s kernel is too old to support the z13 hardware support for CRC32. As a result, the crc32 code will use a software implementation which is significantly slower than the hardware implementation. MongoDB recommends customers upgrade to SLES 12 which has support for the VX instructions.&lt;/p&gt;

&lt;p&gt;&lt;ins&gt;Background&lt;/ins&gt;&lt;/p&gt;
&lt;blockquote&gt;
&lt;p&gt;In IBM Z13 microprocessor, new SIMD instructions were added called VX. In order to support these instructions, a user needs a kernel &amp;gt;= ~3.18 and do not have disabled the VX instructions at kernel boot (i.e., novx was not passed, and so MACHINE_HAS_VX is true).&lt;/p&gt;

&lt;p&gt;The SLES 11 kernel does not support. RHEL 7.2 (Linux 3.10) backported support for the VX instructions. I believe SLES 12 did as well. Ubuntu 16.04 is new enough that it includes support.&lt;/p&gt;

&lt;p&gt;For now, this is a simple fix to disable the s390x CRC32 implementation as scons flag. There does not appear to be an easy way to feature test whether a given machine supports these instructions without running code and parsing auxv. If s390x CRC32 is disabled, we fall back to the software CRC32 implementation which is defined in the x86 CRC implementation.&lt;/p&gt;

&lt;p&gt;Support was added in 3.18 here: &lt;a href=&quot;https://github.com/torvalds/linux/commit/80703617&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/torvalds/linux/commit/80703617&lt;/a&gt;&lt;/p&gt;&lt;/blockquote&gt;</comment>
                            <comment id="1371245" author="xgen-internal-githook" created="Mon, 29 Aug 2016 21:54:27 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;markbenvenuto&apos;, u&apos;name&apos;: u&apos;Mark Benvenuto&apos;, u&apos;email&apos;: u&apos;mark.benvenuto@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-25853&quot; title=&quot;SLES 11 kernel does not support s390x vx instructions&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-25853&quot;&gt;&lt;del&gt;SERVER-25853&lt;/del&gt;&lt;/a&gt; SLES 11 kernel does not support s390x VX instructions&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/3f7812c99ded16e6286e1fd40323e57c939797ed&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/3f7812c99ded16e6286e1fd40323e57c939797ed&lt;/a&gt;&lt;/p&gt;</comment>
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