From mboxrd@z Thu Jan 1 00:00:00 1970 From: Leon Romanovsky Subject: Re: Extend LID space in InfiniBand beyond 48k? Is this really possible? Date: Thu, 30 Mar 2017 07:04:09 +0300 Message-ID: <20170330040409.GL20443@mtr-leonro.local> References: Mime-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="n83H03bbH672hrlY" Return-path: Content-Disposition: inline In-Reply-To: Sender: linux-rdma-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: Vangelis Tasoulas Cc: Linux RDMA Mailing List List-Id: linux-rdma@vger.kernel.org --n83H03bbH672hrlY Content-Type: text/plain; charset=us-ascii Content-Disposition: inline On Wed, Mar 29, 2017 at 06:07:47PM +0200, Vangelis Tasoulas wrote: > 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./ Right, there is no any extended version of that spec. As far as I know, Intel's OmniPath technology is marketed as new and extended version of Infiniband [1], so it is probably that he referenced to it. [1] http://www.intel.com/content/www/us/en/high-performance-computing-fabrics/omni-path-architecture-fabric-overview.html > > Vangelis > --n83H03bbH672hrlY Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iQIzBAEBCAAdFiEEkhr/r4Op1/04yqaB5GN7iDZyWKcFAljcg7kACgkQ5GN7iDZy WKd4BhAAh2fzRhAOJIbz5sHslXj2zYMe8HWdZT1hV4XqHJ48rIdvL9JB1i+ICjX9 fc1guOkttsUDz0tUgSC/fdCVxj6xW4I4pWMUndy0khRCKGzvcDBWvCc5wl7IIB95 ntZmum16HWgiPZ/Q75d8ifqkAwkeI535IHKlCs/Mb1pGl1T4QNWtyuIYmB7A4Fda Bb4BiwzYyKHTQa24TxYt6fAcSqu5/J+4OsoDVlZ+cVJ+UAQBw+2t9FUZZD0csbuf vQBk+afw1t1o3vyPvDYk+idBskmCLwSmxN+Hv+uvMB7quCCG59YSMS/YPG3PGL6l NexW/JpTy19tWwjE0mhssekzaJwjFQrTmmaHr5E4+3ovg9rYKuNVY1yLgF25aaWn 9HzQ4nVwdQTJMVtKj1YrFi9f4LiAqbj1DzPTisXeCCRYqiPb+qUYq6n080hYR9j4 4OpHgKl6MFCK8xolK5RlALI8qz6DCaAIwnK8gr66bbIUx1PsDsYtIE5rzyGwNY9Q 74OtE0wypa4jHrYpkX7TDJSKGW8sndHYPmc1n3VMJgS5LUlBOkm5e6i2z4QIuHzf os7rvoZ1K24fE1tUzyKZ+GGTOTadKHQq3R6jB2bsEsi+GHgJP/kRqsflRgV2RqFx ARMwoeEFcUE8fZ0faRNwc9Upj1FCSAn3BUy5v463yW6l4bPzVSc= =7tPK -----END PGP SIGNATURE----- --n83H03bbH672hrlY-- -- To unsubscribe from this list: send the line "unsubscribe linux-rdma" in the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org More majordomo info at http://vger.kernel.org/majordomo-info.html