Hello Everyone,
Why do we see a difference in the MTU reported here by: ibv_devinfo and
"ifconfig ib0" How do we interpret them?
Also Is there a document where I can read in detail about IPoIB and
applications that benefit from them.
In general I understand that Socket based applications can make use of IPoIB
for a better bandwidth, thought NOT for a better transport latency.
In short I am trying to understand the difference and advantage, for an
Application using "Ethernet NIC" vs "InfiniBand HCA(IPoIB enabled)", apart from
knowing that there is no advantage in terms of transport latency.
Thank you!,
Amit
# ibv_devinfo
hca_id: mthca0
fw_ver: 1.2.0
node_guid: 0006:6a00:9800:e8e7
sys_image_guid: 0006:6a00:9800:e8e7
vendor_id: 0x066a
vendor_part_id: 25204
hw_ver: 0xA0
board_id: MT_0230000001
phys_port_cnt: 1
port: 1
state: PORT_ACTIVE (4)
max_mtu: 2048 (4)
active_mtu: 2048 (4)
sm_lid: 2
port_lid: 29
port_lmc: 0x00
# ifconfig ib0
ib0 Link encap:InfiniBand HWaddr
80:00:04:04:FE:80:00:00:00:00:00:00:00:00:00:00:00:00:00:00
inet addr:172.25.44.250 Bcast:172.25.44.255 Mask:255.255.255.0
inet6 addr: fe80::206:6a00:a000:e8e7/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:65520 Metric:1
RX packets:138863 errors:0 dropped:0 overruns:0 frame:0
TX packets:195994 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:256
RX bytes:11000200 (10.4 MiB) TX bytes:4321658633 (4.0 GiB)
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