- Name
-
tcp_combine_sends_mode - Default
-
0 - Minimum
-
0 - Maximum
-
1 - Scope
- per-stack
This option controls how Onload fills packets in the TCP send buffer:
-
0- Onload prefers to use all the space at the end of a previous packet before allocating a new one (default) -
1- Onload prefers to allocate a new packet for each new send.
In all cases this is a hint rather than guaranteed behavior, and there are
conditions where the preference indicated by this option will not be possible. For
example memory pressure might cause packets in the send queue to be combined. MSG_MORE and TCP_CORK can
override this option when set. The zero-copy sends API can also use the segmentation
provided by the caller's buffers. For full control of message segmentation the delegated
sends API can be used. Setting this option can affect the capacity of send buffers
belonging to sockets in this stack and increase packet buffer usage. It can also reduce
efficiency as packets must be allocated for each send call rather than reusing one that
is already available.
Setting this option is only recommended if you have an explicit need to avoid combined or split sends.