From mboxrd@z Thu Jan 1 00:00:00 1970 From: Vangelis Tasoulas Subject: Extend LID space in InfiniBand beyond 48k? Is this really possible? Date: Wed, 29 Mar 2017 18:07:47 +0200 Message-ID: Mime-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="kjukd2sbHuFVuBRbprsVNRU1l8wbMTqc9" Return-path: Sender: linux-rdma-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: Linux RDMA Mailing List List-Id: linux-rdma@vger.kernel.org This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --kjukd2sbHuFVuBRbprsVNRU1l8wbMTqc9 Content-Type: multipart/mixed; boundary="bUBjG14FfaQUX7Tec1IvJsbM1NwUtW0L0"; protected-headers="v1" From: Vangelis Tasoulas To: Linux RDMA Mailing List Message-ID: Subject: Extend LID space in InfiniBand beyond 48k? Is this really possible? --bUBjG14FfaQUX7Tec1IvJsbM1NwUtW0L0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable 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-fut= ure-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 --bUBjG14FfaQUX7Tec1IvJsbM1NwUtW0L0-- --kjukd2sbHuFVuBRbprsVNRU1l8wbMTqc9 Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- Version: GnuPG v2 iQEcBAEBCAAGBQJY29vWAAoJEBVCOlepmNphF0sIAK+9diZeDOWGJS7TLWMxhSc/ TdjQ9paA6LYAm1qvBKynk0xXyeoULFba36fgctPwFa0rB5Fp3+O7iNlUsigTHI6z VyAC8jq6FkkXCKdqgZ7OkFGBzhHUQF9IR1JpcDAsWWZ2F9FNFqkBIiou39fKlYfU i/slAmhkRWiYXCXqj8f4UmwUCYWYSyDMlpVAUx6Kvr8hdwVzNhlTsiemlTXOElSv bC12SM9EW+c0ny0dBCnyg4jnAQWwQ+d3xWWKvHKM95B1TQiQ8Qe++3XwZpvduXml nsE87d3iL2MpHo92KBqdBZkWj+AKnIaCXFd/dChlFRG4jQsyWN9U7AQuxTouRDo= =BJrh -----END PGP SIGNATURE----- --kjukd2sbHuFVuBRbprsVNRU1l8wbMTqc9-- -- 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