Extend LID space in InfiniBand beyond 48k? Is this really possible?

From: Vangelis Tasoulas <vangelis-S8y2klWGCOFhl2p70BpVqQ@public.gmane.org>
To: Linux RDMA Mailing List
	<linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>
Subject: Extend LID space in InfiniBand beyond 48k? Is this really possible?
Date: Wed, 29 Mar 2017 18:07:47 +0200	[thread overview]
Message-ID: <b9531f99-c350-3985-edae-296b1bc97509@simula.no> (raw)

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Hello,

I was reading a year+ old article where Steve Scott (CRAY CTO) was
interviewed here:
https://www.nextplatform.com/2016/01/08/cray-cto-connects-the-dots-on-future-interconnects/

At a certain point Steve mentions (or at least that's what the article
claims):

/InfiniBand has another limit in terms of the number of logical IDs, or
LIDs, it can support, which is around 48,000 end points, and for the
most point, people have stayed within that limit. There is an extended
version that has some higher packet overhead that can go to higher
scalability./

Is this true? Is there any reference that one can point me to for the
part of the "extended version that has some higher packet overhead that
can go to higher scalability"?

To the best of my knowledge, there is no extended version defined in the
InfiniBand specification. What is mentioned is that /The unicast LID
range is a flat identifier space defined as 0x0001 to 0xBFFF./

Vangelis

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