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-11441 Lustre <p>Under relatively big load a process may spin in obd_get_mod_rpc_slot() for a long time<br/> without successful grabbing a free mod rpc slot. It has been observed<br/> a process spinning more than 100 seconds. See excerpt from lustre logs below. That test ran 72 mdtest-s and 8 IOR-s.</p> <div class="preformatted panel" style="border-width: 1px;"><div class="preformattedContent panelContent"> <pre>00000020:00100000:12.0:1534800918.648481:0:5506:0:(genops.c:2572:obd_get_mod_rpc_slot()) fs1-MDT0000-mdc-ffff88105b2f9000: sleeping for a modify RPC slot opc 101, max 7 ... 00000020:00100000:28.0:1534800934.002775:0:5506:0:(genops.c:2572:obd_get_mod_rpc_slot()) fs1-MDT0000-mdc-ffff88105b2f9000: sleeping for a modify RPC slot opc 101, max 7 ... 00000020:00100000:12.0:1534800972.382794:0:5506:0:(genops.c:2572:obd_get_mod_rpc_slot()) fs1-MDT0000-mdc-ffff88105b2f9000: sleeping for a modify RPC slot opc 101, max 7 ... 00000020:00100000:31.0:1534801033.373093:0:5506:0:(genops.c:2572:obd_get_mod_rpc_slot()) fs1-MDT0000-mdc-ffff88105b2f9000: sleeping for a modify RPC slot opc 101, max 7 </pre> </div></div> <p>It might make sense for obd_get_mod_rpc_slot () to run FIFO wait queue.</p> LU-11441

obd_get_mod_rpc_slot: run FIFO wait queue

Bug Minor Resolved Fixed Vladimir Saveliev Vladimir Saveliev Thu, 27 Sep 2018 21:34:04 +0000 Wed, 10 Oct 2018 02:19:43 +0000 Wed, 10 Oct 2018 02:19:43 +0000 Lustre 2.12.0 0 2 <p>Attached the patch here because for unknown reasons git push started to fail for me with:</p> <div class="preformatted panel" style="border-width: 1px;"><div class="preformattedContent panelContent"> <pre> ! [remote rejected] HEAD -&gt; refs/for/master (not Signed-off-by author/committer/uploader in commit message footer) error: failed to push some refs to 'ssh://vla@review.whamcloud.com:29418/fs/lustre-release' </pre> </div></div> <p>Alexander Zarochentsev (c17826@cray.com) uploaded a new patch: <a href="https://review.whamcloud.com/33282" class="external-link" target="_blank" rel="nofollow noopener">https://review.whamcloud.com/33282</a><br/> Subject: <a href="https://jira.whamcloud.com/browse/LU-11441" title="obd_get_mod_rpc_slot: run FIFO wait queue" class="issue-link" data-issue-key="LU-11441"><del>LU-11441</del></a> obdclass: make mod rpc slot wait queue FIFO<br/> Project: fs/lustre-release<br/> Branch: master<br/> Current Patch Set: 1<br/> Commit: 15bc6978fbbaee0ca003e1eea57e5fc45ec1950d</p> <p>Oleg Drokin (green@whamcloud.com) merged in patch <a href="https://review.whamcloud.com/33282/" class="external-link" target="_blank" rel="nofollow noopener">https://review.whamcloud.com/33282/</a><br/> Subject: <a href="https://jira.whamcloud.com/browse/LU-11441" title="obd_get_mod_rpc_slot: run FIFO wait queue" class="issue-link" data-issue-key="LU-11441"><del>LU-11441</del></a> obdclass: make mod rpc slot wait queue FIFO<br/> Project: fs/lustre-release<br/> Branch: master<br/> Current Patch Set: <br/> Commit: 7fa0fd41577001629f7ecc418cfe814a46207148</p> <p>Landed for 2.12</p> Development Rank 1|i0037z: Rank (Obsolete) 9223372036854775807 Severity