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-14917 Lustre <p>We have seen some customer workloads doing mmap where the mmap readahead algorithm works very poorly.  Investigation showed that the workload is much more like a traditional sequential workload.  Changing the mmap readahead tunables and using madvise both did not result in good readahead behavior.</p> <p>Instead, we tried allowing mmap readahead to use the standard readahead logic, rather than the mmap specific logic.  This worked really well for this workload, so I'm pushing a patch to make that a tunable.</p> LU-14917

allow switching mmap readahead logic

Improvement Minor Open Unresolved Patrick Farrell Patrick Farrell readahead Fri, 6 Aug 2021 16:01:30 +0000 Fri, 24 Nov 2023 05:53:14 +0000 Lustre 2.16.0 0 4 <p>Patrick Farrell (pfarrell@whamcloud.com) uploaded a new patch: <a href="https://review.whamcloud.com/44526" class="external-link" target="_blank" rel="nofollow noopener">https://review.whamcloud.com/44526</a><br/> Subject: <a href="https://jira.whamcloud.com/browse/LU-14917" title="allow switching mmap readahead logic" class="issue-link" data-issue-key="LU-14917">LU-14917</a> llite: Switch mmap readahead logic<br/> Project: fs/lustre-release<br/> Branch: master<br/> Current Patch Set: 1<br/> Commit: e84c44f1e79e4bc5c333e760930158b1470600e9</p> Related LU-14921 LU-15100 Development Rank 1|i0214v: Rank (Obsolete) 9223372036854775807