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<p class="MsoNormal"><span style="font-size:11.0pt">Ko2iblnd tunings depends on the specific hardware and overall LNet config. I would recommend using the default values unless you find performance or reliability issues.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">FWIW, DDN wants to update the default values for peer_credits/peer_credits_hiw/concurrent_sends -
<a href="https://review.whamcloud.com/c/fs/lustre-release/+/41140">https://review.whamcloud.com/c/fs/lustre-release/+/41140</a><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">Chris Horn<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt"><b><span style="color:black">From:
</span></b><span style="color:black">lustre-discuss <lustre-discuss-bounces@lists.lustre.org> on behalf of Andreas Dilger via lustre-discuss <lustre-discuss@lists.lustre.org><br>
<b>Date: </b>Friday, April 12, 2024 at 4:01</span><span style="font-family:"Arial",sans-serif;color:black"> </span><span style="color:black">PM<br>
<b>To: </b>Daniel Szkola <dszkola@fnal.gov><br>
<b>Cc: </b>lustre <lustre-discuss@lists.lustre.org><br>
<b>Subject: </b>Re: [lustre-discuss] ko2iblnd.conf<o:p></o:p></span></p>
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<p class="MsoNormal">The ko2iblnd-opa settings are only used if you have Intel OPA instead of Mellanox cards (depends on the ko2iblnd-probe script). You should still have ko2iblnd line in the server config that is used for MLX cards in order to set the values
to match on both sides. </p>
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<p class="MsoNormal">As for the actual settings, someone with more LNet IB experience should chime in on what is best to use. All I know is that they have to be the same on both sides or they get unhappy, and the usable values depend on the card type and MOFED/OFED
version. As a starting point I would just copy the client ko2iblnd options to the server and see if it works.</p>
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<p class="MsoNormal">Cheers, Andreas</p>
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<p class="MsoNormal">On Apr 11, 2024, at 12:02, Daniel Szkola <<a href="mailto:dszkola@fnal.gov">dszkola@fnal.gov</a>> wrote:</p>
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<p class="MsoNormal">On the server node(s):<br>
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options ko2iblnd-opa peer_credits=32 peer_credits_hiw=16 credits=1024 concurrent_sends=64 ntx=2048 map_on_demand=256 fmr_pool_size=2048 fmr_flush_trigger=512 fmr_cache=1 conns_per_peer=4<br>
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On clients:<br>
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options ko2iblnd peer_credits=128 peer_credits_hiw=64 credits=1024 concurrent_sends=256 ntx=2048 map_on_demand=32 fmr_pool_size=2048 fmr_flush_trigger=512 fmr_cache=1 conns_per_peer=4<br>
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My concern isn’t so much the mismatch because I know that’s an issue but rather what numbers we should settle on with a recent lustre build. I also see the ko2iblnd-opa in the server config, which means because the server is actually loading ko2iblnd that maybe
defaults are used?<br>
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What made me look was we were seeing lots of:<br>
LNetError: 2961324:0:(o2iblnd_cb.c:2612:kiblnd_passive_connect()) Can't accept conn from xxx.xxx.xxx.xxx@o2ib2, queue depth too large: 42 (<=32 wanted)<br>
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—<br>
Dan Szkola<br>
FNAL<br>
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<p class="MsoNormal">On Apr 11, 2024, at 12:36 PM, Andreas Dilger <<a href="mailto:adilger@whamcloud.com">adilger@whamcloud.com</a>> wrote:<br>
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[EXTERNAL] – This message is from an external sender<br>
<br>
<br>
On Apr 11, 2024, at 09:56, Daniel Szkola via lustre-discuss <<a href="mailto:lustre-discuss@lists.lustre.org">lustre-discuss@lists.lustre.org</a>> wrote:<br>
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Hello all,<br>
<br>
I recently discovered some mismatches in our /etc/modprobe.d/ko2iblnd.conf files between our clients and servers.<br>
<br>
Is it now recommended to keep the defaults on this module and run without a config file or are there recommended numbers for lustre-2.15.X?<br>
<br>
The only thing I’ve seen that provides any guidance is the Lustre wiki and an HP/Cray doc:<br>
<br>
<a href="https://www.hpe.com/psnow/resources/ebooks/a00113867en_us_v2/Lustre_Server_Recommended_Tuning_Parameters_4.x.html">https://www.hpe.com/psnow/resources/ebooks/a00113867en_us_v2/Lustre_Server_Recommended_Tuning_Parameters_4.x.html</a><br>
<br>
Anyone have any sage advice on what the ko2iblnd.conf (and possibly ko2iblnd-opa.conf and hfi1.conf as well) on modern systems?</p>
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It would be useful to know what specific settings are mismatched. Definitely some of them need to be consistent between peers, others depend on your system.<br>
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Cheers, Andreas<br>
--<br>
Andreas Dilger<br>
Lustre Principal Architect<br>
Whamcloud<br>
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<p class="MsoNormal"><span style="color:black">Cheers, Andreas<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="color:black">--<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="color:black">Andreas Dilger<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="color:black">Lustre Principal Architect<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="color:black">Whamcloud<o:p></o:p></span></p>
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