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Date:   Tue, 24 Nov 2020 19:01:25 +0000 (UTC)
From:   Christopher Lameter <cl@linux.com>
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Subject: Re: Is there a working cache for path record and lids etc for
 librdmacm?
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On Mon, 23 Nov 2020, Håkon Bugge wrote:

> > Got version 33.0 from Redhat with the option. Set it but ibacm still times
> > out when trying to contact the SM.
>
> Contact the peer ibacm, that is. Is it started?


It can contact the peer ibacm if its running on a particular host. Then
the resolution succeeds. But we want ibacm to talk to the subnet manager.

> And, ib_acme bypasses the kernel_only check. I assume a real app (e.g.,
> qperf <destination_ip> -cm1 rc_bw) would work, but incur an excess delay
> due to the ibacm timeout, before failing back to the kernel neighbour
> cache.

Ok. But what does it matter?


How do I figure out why ibacm is not talking to the subnet manager?
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