CONTROLLING IPOIB MODE(DATAGRAM MODE, CONNECTED MODE)

datagram mode

2KB IB MTU: 2044 bytes.(maximum)

4KB IB MTU: 4092 bytes.(maximum)

connected mode

65520 bytes.(maximum)

Controlling IPoIB mode

# cat /sys/class/net/ib0/mode

datagram

# cd /etc/sysconfig/network-scripts

# ./ifdown ib0

# echo connected > /sys/class/net/ib0/mode

# ./ifup ib0

# cat /sys/class/net/ib0/mode

connected

# vi /etc/infiniband/openib.conf

#SET_IPOIB_CM=auto

SET_IPOIB_CM=yes

IPOIB_MTU=65520

※ connected mode = no
# sed -i 's/SET_IPOIB_CM=auto/SET_IPOIB_CM=no/g' /etc/infiniband/openib.conf