[libfabric-users] IPoIB and verbs provider
arun.ilango at intel.com
Tue Sep 10 12:00:24 PDT 2019
> Unfortunately, this doesn't work - it fails with an IP address not found
Can you try running the fi_info utility that ships with libfabric? "fi_info -p verbs" should list entries for the verbs provider with protocol: FI_PROTO_RDMA_CM_IB_RC and FI_PROTO_RXM. If it doesn't show them, can you re-run with FI_LOG_LEVEL=info and share the logs?
> Furthermore, when we do assign a globally routable IP address,
> an IP based transport is used, rather than the RDMA that should
> give better performance.
Please run fi_info for this case as well.
From: Libfabric-users <libfabric-users-bounces at lists.openfabrics.org> On Behalf Of Matthew Alexandrakis
Sent: Friday, September 06, 2019 6:12 AM
To: libfabric-users at lists.openfabrics.org
Subject: [libfabric-users] IPoIB and verbs provider
We have been configuring ofi for the 2019 Intel Compiler. More specifically, we used the verbs provider (Linux plus Infiniband), which requires an IPoIB - which was not previously required by OFA.
We have several Infiniband islands - though it's possible in the future we could join them together. The easiest way for us to configure IPoIB would be to use an IPv6 Link local address (if we then joined islands together it would just work). Unfortunately, this doesn't work - it fails with an IP address not found. Furthermore, when we do assign a globally routable IP address, an IP based transport is used, rather than the RDMA that should give better performance.
Going through the latest release notes, I noticed that IPv6 functionality was mentioned in v1.7.0, under Core: "Enhance IPv6 addressing support for AVs" and Sockets: "Add support for IPv6". Indeed, Sockets did work with IPv6 enabled. Verbs, on the other hand, defaulted running over Ethernet instead. Is IPv6 meant to work with verbs or is it Sockets-only?
Both the internal Intel libfabric 1.7.2a-impi, and 1.8.0 were used, with the same results.
Research Software Engineer, IT Services
Queen Mary University of London
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