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-16033 Lustre <p>ll_use_fast_io() calculates whether current readahead window covers next_readahead + max rpc pages, if that's the case, we can issue a readahed RPC, so we'd not do fast IO because we will need a cl_io to issue the RPC, otherwise we'd return true and do fast IO w/o issueing readahead RPC.</p> <p>While for stride mode, the to-be-covered pages algorithm is</p> <div class="code panel" style="border-width: 1px;"><div class="codeContent panelContent"> <pre class="code-java"> max_rpc_pages * (ras-&gt;ras_stride_length + ras-&gt;ras_stride_bytes - 1) / stride_bytes</pre> </div></div> <p>which is not so accurate.</p> LU-16033

refine ll_use_fast_io() for stride mode

Improvement Major Open Unresolved Zhenyu Xu Zhenyu Xu Thu, 21 Jul 2022 14:18:15 +0000 Thu, 21 Jul 2022 14:19:24 +0000 0 4 <p>"Bobi Jam &lt;bobijam@hotmail.com&gt;" uploaded a new patch: <a href="https://review.whamcloud.com/48007" class="external-link" target="_blank" rel="nofollow noopener">https://review.whamcloud.com/48007</a><br/> Subject: <a href="https://jira.whamcloud.com/browse/LU-16033" title="refine ll_use_fast_io() for stride mode" class="issue-link" data-issue-key="LU-16033">LU-16033</a> llite: refine ll_use_fast_io() for stride mode<br/> Project: fs/lustre-release<br/> Branch: master<br/> Current Patch Set: 1<br/> Commit: 28bd9283ad4049c17cfdbb2d887f6bf522aac6cd</p> Development Rank 1|i02v53: Rank (Obsolete) 9223372036854775807