Hi guys.
Hoping some net experts my stumble upon this message, I have
an IPoIB direct host to host connection and:
-> $ ethtool ib1
Settings for ib1:
Supported ports: [ ]
Supported link modes: Not reported
Supported pause frame use: No
Supports auto-negotiation: No
Supported FEC modes: Not reported
Advertised link modes: Not reported
Advertised pause frame use: No
Advertised auto-negotiation: No
Advertised FEC modes: Not reported
Speed: 40000Mb/s
Duplex: Full
Auto-negotiation: on
Port: Other
PHYAD: 255
Transceiver: internal
Link detected: yes
and that's both ends, both hosts, yet:
> $ iperf3 -c 10.5.5.97
Connecting to host 10.5.5.97, port 5201
[ 5] local 10.5.5.49 port 56874 connected to 10.5.5.97 port
5201
[ ID] Interval Transfer Bitrate Retr Cwnd
[ 5] 0.00-1.00 sec 1.36 GBytes 11.6 Gbits/sec 0
2.50 MBytes
[ 5] 1.00-2.00 sec 1.87 GBytes 16.0 Gbits/sec 0
2.50 MBytes
[ 5] 2.00-3.00 sec 1.84 GBytes 15.8 Gbits/sec 0
2.50 MBytes
[ 5] 3.00-4.00 sec 1.83 GBytes 15.7 Gbits/sec 0
2.50 MBytes
[ 5] 4.00-5.00 sec 1.61 GBytes 13.9 Gbits/sec 0
2.50 MBytes
[ 5] 5.00-6.00 sec 1.60 GBytes 13.8 Gbits/sec 0
2.50 MBytes
[ 5] 6.00-7.00 sec 1.56 GBytes 13.4 Gbits/sec 0
2.50 MBytes
[ 5] 7.00-8.00 sec 1.52 GBytes 13.1 Gbits/sec 0
2.50 MBytes
[ 5] 8.00-9.00 sec 1.52 GBytes 13.1 Gbits/sec 0
2.50 MBytes
[ 5] 9.00-10.00 sec 1.52 GBytes 13.1 Gbits/sec 0
2.50 MBytes
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval Transfer Bitrate Retr
[ 5] 0.00-10.00 sec 16.2 GBytes 13.9 Gbits/sec
0 sender
[ 5] 0.00-10.00 sec 16.2 GBytes 13.9
Gbits/sec receiver
It's rather an oldish platform which hosts the link, PCIe is
only 2.0 but with link of x8 that should be able to carry
more than ~13Gbits/sec.
Infiniband is Mellanox's ConnectX-3.
Any thoughts on how to track the bottleneck or any thoughts
I'll appreciate much.
thanks, L
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