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-9356 Lustre <p>During 16MB bulk RPC I/O evaluation on rhel7, due to kernel BIO_MAX_PAGES (256) limit, the 16MB IO is divided into 16 1MB I/O submitting to underly block device one by one. And we found that the SFA disk driver got lots of 1MB IOs.</p> <p>To optimize the performance, this patch introduces blk_plug into osd-ldiskfs when do bio, before submit IOs, it calls blk_start_plug, after submit all 16MB IOs, calls blk_finish_plug, so that the 16MB bulk IO will have more change to merge in the block evelvator scheduler layer.</p> LU-9356

add blk_plug into osd-ldiskfs when do bio

Improvement Minor Resolved Fixed Qian Yingjin Qian Yingjin Tue, 18 Apr 2017 06:04:59 +0000 Mon, 19 Jun 2017 14:22:11 +0000 Fri, 28 Apr 2017 22:22:21 +0000 Lustre 2.10.0 0 4 <p>Yingjin Qian (qian@ddn.com) uploaded a new patch: <a href="https://review.whamcloud.com/26697" class="external-link" target="_blank" rel="nofollow noopener">https://review.whamcloud.com/26697</a><br/> Subject: <a href="https://jira.whamcloud.com/browse/LU-9356" title="add blk_plug into osd-ldiskfs when do bio" class="issue-link" data-issue-key="LU-9356"><del>LU-9356</del></a> osd-ldiskfs: add blk_plug when do bio<br/> Project: fs/lustre-release<br/> Branch: master<br/> Current Patch Set: 1<br/> Commit: 3c8aa6748b197bb1bc12f36eec4169bfbd433767</p> <p>What else might be interesting in this area in the future would be to combine the IO queue plugging with NRS (like ORR, or similar enhancements to TBF) so that small write RPCs from multiple clients can be merged into a single large write by one OSS thread. </p> <p>Essentially the OSS thread would select multiple RPCs from the queue based on FID and file offset and then remove them from the NRS queue and process them together so that they can be merged before submission to the block device.</p> <p>Oleg Drokin (oleg.drokin@intel.com) merged in patch <a href="https://review.whamcloud.com/26697/" class="external-link" target="_blank" rel="nofollow noopener">https://review.whamcloud.com/26697/</a><br/> Subject: <a href="https://jira.whamcloud.com/browse/LU-9356" title="add blk_plug into osd-ldiskfs when do bio" class="issue-link" data-issue-key="LU-9356"><del>LU-9356</del></a> osd-ldiskfs: add blk_plug when do bio<br/> Project: fs/lustre-release<br/> Branch: master<br/> Current Patch Set: <br/> Commit: 68d19d5a0a772a002054d516f99464db4a478556</p> <p>Landed for 2.10</p> Related LU-7990 Development Rank 1|hzzagf: Rank (Obsolete) 9223372036854775807