Question & Answer
I am configuring VIO Servers and AIX VIO Clients on Power system. There are many network attributes realated to laregsend and jumbo frame such as largesend, large_send, mtu_bypass, jumbo_frame, use_jumbo_frame. I am confused about these attributes. I want to understand how largesend and jumbo_frame work and what is the difference between two.
In case 1, Messages are segmented to MTU size 1500 by TCP Kernel stack in AIX.
In case 2, Messages are segmented to MTU size 1500 by Real Ethernet Adapter.
In case 3, Messages are segmented to MTU size 9000 by TCP Kernel stack in AIX.
In case 4, Messages are segmented to MTU size 9000 by Real Ethernet Adapter.
- largesend and jumbo frame does two different actions. These actions are mutually independent.
- largesend decides who does the segmentation.
- jumbo frame decides the size of the segmented packet that goes on the wire.
Authors: Darshan Patel, Perry Smith, Saania Khanna
17 June 2018