About

A low-level network/socket library.

TCP Tunning

When running the client/server examples with a larger number of concurrent connections or with keep-alive disabled make sure to tune your system to get good results.

Linux

# somaxconn needs to be larger then the listen backlog value used by the server.
# (see note below about listen backlog).
echo 65536 > /proc/sys/net/core/somaxconn
# These are useful when stress testing/benchmarking where a large number of connections
# will be opened & closed quickly.
echo 1 >/proc/sys/net/ipv4/tcp_tw_recycle
echo 1 >/proc/sys/net/ipv4/tcp_tw_reuse
echo 10 >/proc/sys/net/ipv4/tcp_fin_timeout
# increase client-side port range, not needed on server.
echo 1024 65535 > /proc/sys/net/ipv4/ip_local_port_range
# If you have iptables setup with the connection tracking (nf_conntrack) module enabled
# then also increase these values
echo 262144 >/proc/sys/net/netfilter/nf_conntrack_max
echo 32768 >/sys/module/nf_conntrack/parameters/hashsize

Note about listen backlog

If the backlog value passed to listen() is greater then the value in /proc/sys/net/core/somaxconn it will be silenty truncated to some very small value. This goes against what the man-page for listen() says:

If    the   backlog   argument   is   greater   than   the   value   in
/proc/sys/net/core/somaxconn, then it is  silently  truncated  to  that
value;  the  default  value  in  this  file  is 128.  In kernels before
2.4.25, this limit was a hard coded value, SOMAXCONN,  with  the  value
128.

Installation

Lastest Git Revision

With CMake:

$ git clone git://github.com/Neopallium/lua-llnet.git
$ cd lua-llnet ; mkdir build ; cd build
$ cmake ..
$ make
$ sudo make install

Example usage

See the files under the examples/ folder