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<p class="MsoNormal"><span style="color:#1F497D">Please see inline<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Brent <o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b>From:</b> Lin, Shuicheng [mailto:shuicheng.lin@intel.com]
<br>
<b>Sent:</b> Sunday, January 13, 2019 9:28 PM<br>
<b>To:</b> Somerville, Jim <Jim.Somerville@windriver.com>; Little, Scott <Scott.Little@windriver.com>; Wold, Saul <saul.wold@intel.com>; Rowsell, Brent <Brent.Rowsell@windriver.com>; Hu, Yong <yong.hu@intel.com>; Xie, Cindy <cindy.xie@intel.com><br>
<b>Cc:</b> starlingx-discuss@lists.starlingx.io<br>
<b>Subject:</b> RT kernel upgrade in CentOS 7.6<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Hi all,<o:p></o:p></p>
<p class="MsoNormal">For CentOS 7.6, the latest source rpm package we have for std and rt kernel are:<o:p></o:p></p>
<p class="MsoNormal">Std kernel: kernel-3.10.0-957.1.3.el7.src.rpm<o:p></o:p></p>
<p class="MsoNormal">Rt kernel: kernel-rt-3.10.0-957.rt56.910.el7.src.rpm<o:p></o:p></p>
<p class="MsoNormal">You could find std kernel is 1 minor version ahead of rt kernel. And there is some discussion about it in patch [0].<o:p></o:p></p>
<p class="MsoNormal">There are some question I want to ask, and need your suggestion. Thanks in advance.<span style="color:#1F497D"><o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">1<sup>st</sup> question: Is it acceptable to have minor different version for std and rt kernel? If not, why?<o:p></o:p></p>
<p class="MsoNormal"><span style="color:#1F497D">[BR] We want to align on a single version as we do not want to deal with two different kernel versions for changes (ex. CVE’s)<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.25in"><o:p> </o:p></p>
<p class="MsoNormal">2<sup>nd</sup> question: If we decide to upgrade rt kernel to the same version as std. There are several way to do it:<o:p></o:p></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo2"><![if !supportLists]><span style="mso-list:Ignore">a)<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]>We generate the src rpm based on code in GIT manually. And save the rpm package to CENGN server. So mirror downloader script could get the new src rpm as previous.<o:p></o:p></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo2"><![if !supportLists]><span style="mso-list:Ignore">b)<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]>We switch to git code instead of src rpm package. We Add the rt kernel git to our manifest file, and download rt kernel code when do “repo sync”.
<o:p></o:p></p>
<p class="MsoNormal"><span style="color:#1F497D">[BR] I think this is the preferred path.
<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo2"><![if !supportLists]><span style="mso-list:Ignore">c)<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]>Keep current RT kernel first, and upgrade to new rt kernel when new src rpm is available. I don’t know why it is not available yet. :)<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">[0]: <a href="https://review.openstack.org/625773">https://review.openstack.org/625773</a><o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Best Regards<o:p></o:p></p>
<p class="MsoNormal">Shuicheng<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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