[sr-dev] git:master:38a696ff: doc/tutorials/tcp_tunning: note about network buffers size

Module: kamailio Branch: master Commit: 38a696fff66f0a453e54c92c93e8c459a1b4e77d URL: https://github.com/kamailio/kamailio/commit/38a696fff66f0a453e54c92c93e8c45… Author: Daniel-Constantin Mierla <miconda(a)gmail.com> Committer: Daniel-Constantin Mierla <miconda(a)gmail.com> Date: 2019-01-15T13:02:08+01:00 doc/tutorials/tcp_tunning: note about network buffers size - they may need tunning when dealing with large data --- Modified: doc/tutorials/tcp_tunning.txt --- Diff: https://github.com/kamailio/kamailio/commit/38a696fff66f0a453e54c92c93e8c45… Patch: https://github.com/kamailio/kamailio/commit/38a696fff66f0a453e54c92c93e8c45… --- diff --git a/doc/tutorials/tcp_tunning.txt b/doc/tutorials/tcp_tunning.txt index 39097d57b7..aca6a12449 100644 --- a/doc/tutorials/tcp_tunning.txt +++ b/doc/tutorials/tcp_tunning.txt @@ -19,22 +19,22 @@ For now it deals only with Linux specific optimizations. net.core.somaxconn - limit of the listen() backlog, default 128 net.ipv4.tcp_max_syn_backlog - default 1024 or 128 -net.ipv4.tcp_timestamps - default on., should be on (along with +net.ipv4.tcp_timestamps - default on., should be on (along with tcp_tw_recycle and timestamp supporting peers allows for fast connections rates) -1.2 connection in close_wait +1.2 Connection in close_wait - Connection should stay as little as possible - in close_wait to quickly free the fd/resources for new connections attempts - WARNING: this could break normal TCP use, use it only if you know what you are + Connection should stay as little as possible + in close_wait to quickly free the fd/resources for new connections attempts + WARNING: this could break normal TCP use, use it only if you know what you are doing - + net.ipv4.tcp_max_tw_buckets - maximum number of timewait sockets (the default seems to be ok) net.ipv4.tcp_tw_recycle - enables fast time wait sockets recycling (default off), should be enabled if you have lots of short - lived connections + lived connections WARNING: see the above warning net.ipv4.tcp_tw_reuse - allows reusing of time-wait sockets (default off) WARNING: see above @@ -49,10 +49,26 @@ net.ipv4.ip_local_port_range - should be increased (e.g. 4096-65534) 1.4 Open file descriptors fs.file-max - maximum number of fds that will be allocated - (you probably need to increase it, default + (you probably need to increase it, default depends on installed memory) -1.5 other sysctl that might affect tcp connection rate or the maximum number +1.5 Buffers size + + When dealing with large data, check the values for network sockets buffers + to be sufficient, among them: + +net.core.rmem_max +net.core.wmem_max +net.core.rmem_default +net.core.wmem_default +net.ipv4.tcp_mem +net.ipv4.tcp_rmem +net.ipv4.tcp_wmem + + Note: sysctl -w net.ipv4.route.flush=1 - enusre that immediatly subsequent + connections use the values + +1.6 Other sysctl that might affect tcp connection rate or the maximum number of open connections fs.epoll.max_user_instances - maximum number of devices - per user (2.6.27.8+)