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Hello Gwen,
<div class="">I'm not a networking expert, but it seems entirely possible that the MR discovery in 2.12.9
<div class="">isn't doing as well as what is in 2.15.3 (or 2.15.4 for that matter). It would make more sense</div>
<div class="">to have both nodes running the same (newer) version before digging too deeply into this.</div>
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<div class="">We have definitely seen performance > 1 IB interface from a single node in our testing,</div>
<div class="">though I can't say if that was done with lnet_selftest or with something else.</div>
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<div class="">Cheers, Andreas<br class="">
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<div class="">On Jan 16, 2024, at 08:14, Gwen Dawes via lustre-discuss <<a href="mailto:lustre-discuss@lists.lustre.org" class="">lustre-discuss@lists.lustre.org</a>> wrote:</div>
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<div class="">Hi folks,<br class="">
<br class="">
Let's try that again.<br class="">
<br class="">
I'm in the luxury position of having four IB cards I'm trying to<br class="">
squeeze the most performance out of for Lustre I can.<br class="">
<br class="">
I have a small test setup - two machines - a client (2.12.9) and a<br class="">
server (2.15.3) with four IB cards each. I'm able to set them up as<br class="">
Multi-Rail and each one can discover the other as such. However, I<br class="">
can't seem to get lnet_selftest to give me more speed than a single<br class="">
interface, as reported by ib_send_bw.<br class="">
<br class="">
Am I missing some config here? Is LNet just not capable of doing more<br class="">
than one connection per NID?<br class="">
<br class="">
Gwen<br class="">
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<div>Cheers, Andreas</div>
<div>--</div>
<div>Andreas Dilger</div>
<div>Lustre Principal Architect</div>
<div>Whamcloud</div>
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