On Sun, Apr 1, 2018 at 4:06 AM Naruto Nguyen
wrote:
> Hello everyone,
> As I know we have a socket option SO_TCP_NODELAY to disable Nagle
> Algorithm, and I found it is implemented in TCP/IP stack at
> https://elixir.bootlin.com/linux/v4.4.90/source/net/ipv4/tcp.c#L2401 .
> However, I do not know where the source code the Nagle Algorithm is
> implemented in kernel. If you know, could you please help me?
The Linux TCP code for Nagle's algorithm is largely in tcp_output.c
in the following functions:
tcp_nagle_check(), tcp_minshall_check(), tcp_minshall_update()
The variant of the Nagle algorithm that Linux implements is described here:
https://tools.ietf.org/html/draft-minshall-nagle-00
Basically, the algorithm avoids having more than one outstanding
unacknowledged packet that is less than one MSS in size.
The Nagle algorithm is disabled using the TCP_NODELAY socket option.
neal