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-10526 Lustre <p>Recently, a change has been merged to "lnet/klnds/o2iblnd/o2iblnd.c" which introduces the usage of IB_DEVICE_SG_GAPS_REG and IB_MR_TYPE_SG_GAPS.</p> <p>Unfortunately, these symbols are not available in the 4.4.0 Kernels as used by Ubuntu 14/16.</p> <p>Additionally, there seems to be general warning against their use:</p> <ul> <li><a href="https://patchwork.kernel.org/patch/9573483/" class="external-link" target="_blank" rel="nofollow noopener">https://patchwork.kernel.org/patch/9573483/</a></li> <li><a href="https://lkml.org/lkml/2017/3/13/206" class="external-link" target="_blank" rel="nofollow noopener">https://lkml.org/lkml/2017/3/13/206</a></li> </ul> <p>Also, there is a related performance issue as reported in <a href="https://jira.whamcloud.com/browse/LU-10394" title="IB_MR_TYPE_SG_GAPS mlx5 LNet performance drop" class="issue-link" data-issue-key="LU-10394"><del>LU-10394</del></a>.</p> <p> </p> <p>The solution is to create a preprocessor guard around their use, so that Kernels lacking these symbols will not use them and revert to using the older IB_MR_TYPE_MEM_REG, instead.</p> Distribution: Ubuntu 14.04/16.04<br/> Kernel: 4.4.0-* LU-10526

Ubuntu Kernel 4.4.0 lacks IB_DEVICE_SG_GAPS_REG and IB_MR_TYPE_SG_GAPS symbols

Technical task LU-9564 Minor Resolved Fixed WC Triage Martin Schröder Wed, 17 Jan 2018 10:13:44 +0000 Tue, 11 Sep 2018 23:40:49 +0000 Thu, 25 Jan 2018 05:04:49 +0000 Lustre 2.10.2 Lustre 2.11.0 0 3 <p>Martin Schroeder (martin.h.schroeder@intel.com) uploaded a new patch: <a href="https://review.whamcloud.com/30893" class="external-link" target="_blank" rel="nofollow noopener">https://review.whamcloud.com/30893</a><br/> Subject: <a href="https://jira.whamcloud.com/browse/LU-10526" title="Ubuntu Kernel 4.4.0 lacks IB_DEVICE_SG_GAPS_REG and IB_MR_TYPE_SG_GAPS symbols" class="issue-link" data-issue-key="LU-10526"><del>LU-10526</del></a> build: Ubuntu Kernel 4.4.0 lacks symbols used by o2iblnd.c<br/> Project: fs/lustre-release<br/> Branch: master<br/> Current Patch Set: 1<br/> Commit: cbffd11b4b7da1d252541b46c54439d59b594272</p> <p>Oleg Drokin (oleg.drokin@intel.com) merged in patch <a href="https://review.whamcloud.com/30893/" class="external-link" target="_blank" rel="nofollow noopener">https://review.whamcloud.com/30893/</a><br/> Subject: <a href="https://jira.whamcloud.com/browse/LU-10526" title="Ubuntu Kernel 4.4.0 lacks IB_DEVICE_SG_GAPS_REG and IB_MR_TYPE_SG_GAPS symbols" class="issue-link" data-issue-key="LU-10526"><del>LU-10526</del></a> build: Ubuntu Kernel 4.4.0 lacks symbols used by o2iblnd.c<br/> Project: fs/lustre-release<br/> Branch: master<br/> Current Patch Set: <br/> Commit: 73ff9cb8de7a7515f98694deab4afc7df1f8d3b2</p> <p>Landed for 2.11</p> <p>according to <a href="https://jira.whamcloud.com/secure/ViewProfile.jspa?name=ashehata" class="user-hover" rel="ashehata">ashehata</a>, we don't need this in LTS 2.10.x</p> Blocker LU-9564 Development Epic lnet Epic/Theme lnet Rank 1|hzzr9b: Rank (Obsolete) 9223372036854775807