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The latest versions of AIX now allow largesend on virtual adapters to remain persistent across reboots. I can’t find any information for this attribute in the AIX 7.1 Information center yet.
The new attrribute is called mtu_bypass and can be changed with the chdev command. e.g
; AIX 7.1 TL1 SP2.
# oslevel -s
7100-01-02-1150
; LARGESEND is off.
# ifconfig en1
en1: flags=1e080863,480<UP,BROADCAST,NOTRAILERS,RUNNING,SIMPLEX,MULTICAST,GROUPRT,64BIT,CHECKSUM_OFFLOAD(ACTIVE),CHAIN>
inet 10.153.20.46 netmask 0xffff0000 broadcast 10.153.255.255
tcp_sendspace 262144 tcp_recvspace 262144 rfc1323 1
; mtu_bypass is disabled.
# lsattr -El en1 -a mtu_bypass
mtu_bypass off Enable/Disable largesend for virtual Ethernet True
; mtu_bypass is now enabled.
# chdev -l en1 -a mtu_bypass=on
en1 changed
# lsattr -El en1 -a mtu_bypass
mtu_bypass on Enable/Disable largesend for virtual Ethernet True
; LARGESEND is on.
# ifconfig en1
en1: flags=1e080862,4c0<BROADCAST,NOTRAILERS,RUNNING,SIMPLEX,MULTICAST,GROUPRT,64BIT,CHECKSUM_OFFLOAD(ACTIVE),LARGESEND,CHAIN>
inet 10.153.20.46 netmask 0xffff0000 broadcast 10.153.255.255
tcp_sendspace 262144 tcp_recvspace 262144 rfc1323 1
