[ofa-general] Obtaining RDMA statistics for an InfiniBand interface

[Hal Rosenstock]

Eli,

On Tue, 2008-03-18 at 15:06 +0200, Eli Cohen wrote:
> Hal, can you explain the mechanism that can be used to get counter
> values larger than 32 bits? I see that the IB spec defines the counters
> as 32 bits.

Polling (at a configurable rate), clearing above some threshold, and
aggregation into larger counters on the manager side.  For OpenSM, see
perf-manager-arch.txt or the current implementation: osm_perfmgr.c and
osm_perfmgr_db.c

-- Hal