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-9905 Lustre <p>cpu_npartitions=10 is configured manually, but after re-loaded module, never cpu_partition_table changed.</p> <div class="preformatted panel" style="border-width: 1px;"><div class="preformattedContent panelContent"> <pre>[root@oss01 ~]# umount -t lustre -a; lustre_rmmod [root@oss01 ~]# cat /etc/modprobe.d/lustre.conf options lnet networks="o2ib10(ib0)" options libcfs cpu_npartitions=10 [root@oss01 ~]# mount -t lustre 10.0.10.167@o2ib10:10.0.10.168@o2ib10:/scratch /scratch -o localflock [root@oss01 ~]# cat /proc/sys/lnet/cpu_partition_table 0 : 0 2 4 6 8 10 12 14 16 18 1 : 1 3 5 7 9 11 13 15 17 19 </pre> </div></div> LU-9905

cpu_npartitions is not configured properly

Bug Minor Resolved Not a Bug Dmitry Eremin Shuichi Ihara Wed, 23 Aug 2017 09:06:42 +0000 Wed, 22 Nov 2017 19:25:33 +0000 Tue, 10 Oct 2017 10:50:39 +0000 Lustre 2.10.0 0 4 <p>Dmitry</p> <p>Can you please advise on this one?</p> <p>Thanks</p> <p>Peter</p> <p>Sorry for delay. This behavior is expected. Resently we changed the default value for CPU partitions.</p> <p><a href="https://review.whamcloud.com/22507" class="external-link" target="_blank" rel="nofollow noopener">https://review.whamcloud.com/22507</a></p> <p>So, now <b>cpu_pattern</b> is specified and have default value "<b>N</b>". But if <b>cpu_pattern</b> is specified, the <b>cpu_npartitions</b> will be ignored.</p> <p>You can return to previous behavior by spefifing empty value for <b>cpu_pattern</b>.</p> <p>So, please use the following configuration:</p> <blockquote> <p>options libcfs cpu_pattern="" cpu_npartitions=10</p></blockquote> <p>ok, that workaround works. you can close this ticket.<br/> However, after patch 22507 landed, default partition configuation for MDS caused huge performance regression. please check <a href="https://jira.whamcloud.com/browse/LU-9998" title="Default partition setup is not optimal for best metadata performance" class="issue-link" data-issue-key="LU-9998"><del>LU-9998</del></a>.</p> Development Rank 1|hzziuv: Rank (Obsolete) 9223372036854775807 Severity