Not sure if this is a RedHat, IBM, or OpenFabrics issue, but thought
this might be a good place to start....
Environment:
IBM HS20 (8843), each with 1x IB card (26K6456: board_id: HCA.Cougar.A1)
IBM/TopSpin switch module (26K6453)
RHEL 5.3 Server w/ OFED 1.3.1 (as comes with the 5.3 distribution)
(I know this is somewhat dated, but it's what I have to experiment with
at the moment)
I pretty much just installed things and started them up. No tuning or
updating of software etc....
I've got interfaces setup on each machine:
hs20[ab] = Ethernet
hs20[ab]-ib = Infiniband
both seem to be working for normal IP stuff (ssh, ping, etc...)
I was curious about performance so I ran qperf:
starting the server on hs20a with :
hs20a> qperf
running the client from hs20b:
hs20b> qperf hs20a tcp_bw
tcp_bw:
bw = 118 MB/sec
hs20b> qperf hs20a-ib tcp_bw
tcp_bw:
bw = 1.15 MB/sec <-- Not a typo!
hs20b> qperf hs20a-ib sdp_bw
sdp_bw:
bw = 238 MB/sec
I got similar results using netperf.
Can anyone account for the poor performance in case 2? I'm unclear
whether it's obsolete hardware, misconfigured software/hardware,
deficiencies in
1.3.1 software, or my misinterpretation of the results, but 1.15MB/sec seems
pretty bad.
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