https://jira.whamcloud.com This file is an XML representation of an issue en-us 9.4.14 940014 05-12-2023 https://jira.whamcloud.com/browse/LU-13537 Lustre <p>Introduced in 2.11.56, patch <a href="https://review.whamcloud.com33233/" class="external-link" target="_blank" rel="nofollow noopener">https://review.whamcloud.com33233/</a> "<tt><a href="https://jira.whamcloud.com/browse/LU-11427" title="Data on MDT performance tune" class="issue-link" data-issue-key="LU-11427"><del>LU-11427</del></a> lod: create layout in mdo_create()</tt>", while increasing read performance, has introduced a significant degradation with mdtest stat performance.</p> <p>mdtest stat results before the commit:</p> <div class="preformatted panel" style="border-width: 1px;"><div class="preformattedContent panelContent"> <pre>MDT0:  349803.384 MDT1:  342253.747 MDT2:  347820.775 MDT3:  323354.925</pre> </div></div> <p>mdtest stat results after the commit:</p> <div class="preformatted panel" style="border-width: 1px;"><div class="preformattedContent panelContent"> <pre>MDT0:  109842.167 MDT1:  114794.457 MDT2:  104197.950 MDT3:  108848.941</pre> </div></div> LU-13537

DoM: Commit d7073b8 causes significant stat performance degradation

Bug Major Open Unresolved WC Triage Petros Koutoupis Fri, 8 May 2020 15:42:08 +0000 Mon, 31 Oct 2022 20:09:15 +0000 Upstream Lustre 2.12.0 Lustre 2.12.5 0 5 <p><a href="https://jira.whamcloud.com/secure/ViewProfile.jspa?name=Jinshan" class="user-hover" rel="Jinshan">Jinshan</a>, did you have a take on this? Did you expect the stat regression given the boost in reads that you provided with that change?</p> <p>Hi <a href="https://jira.whamcloud.com/secure/ViewProfile.jspa?name=koutoupis" class="user-hover" rel="koutoupis">koutoupis</a> </p> <p>Was this ever resolved on your side?</p> <p>Colin,</p> <p>In a way, yes. We reverted it on our end; as it continues to show a regression with our test systems and even larger cluster deployments. I am not sure what you want to do here. If you believe that the issue should be closed, I won't argue. <img class="emoticon" src="https://jira.whamcloud.com/images/icons/emoticons/smile.png" height="16" width="16" align="absmiddle" alt="" border="0"/></p> Development Epic metadata Epic/Theme Performance Rank 1|i00zxb: Rank (Obsolete) 9223372036854775807 Severity