How To: Network / TCP / UDP Tuning This is a very basic step by step description of how to improve the performance networking (TCP & UDP) on Linux 2.4+ for high-bandwidth applications. These settings are especially important for GigE links. Jump to Quick Step or All The Steps. TCP tuning Like most modern OSes, Linux now does a good job of auto-tuning the TCP buffers, but the default maximum Linux TCP buffer sizes are still too small. Here are some example sysctl.conf commands for different types of hosts.

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• Linux Tcp Auto Tuning

1. Sending data from Windows is slow over any network with high latency but linux is fast. To enable TCP Window Scaling set Auto-Tuning level for example to normal.
2. Linux TCP Tuning 1. The application first writes the data to a socket which in turn is put in the transmit buffer. The kernel encapsulates the data into a PDU - protocol data unit. The PDU is then moved onto the per-device transmit queue. The NIC driver then pops the PDU from the.
3. Linux TCP Tuning 1. The application first writes the data to a socket which in turn is put in the transmit buffer. The kernel encapsulates the data into a PDU - protocol data unit. The PDU is then moved onto the per-device transmit queue. The NIC driver then pops the PDU from the.
4. Mar 30, 2020  Tuning is very dependent on the specifications of the particular platform. Intel carefully determines the tuning parameters for a limited set of platforms, and makes them available for autotuning using the IMPITUNINGMODE environment variable. For the full list of platforms supported by the IMPITUNINGMODE environment variable, see Tuning Environment Variables.
5. TCP auto tuning. Depending on your specific operating system/version and configuration, your network settings may be autotuned. To check if autotune is enabled on many linux based systems: If tcpmoderatercvbuf is set to 1, autotuning is active and buffer size is adjusted dynamically.

I‘ve two servers located in two different data center. Both server deals with a lot of concurrent large file transfers. But network performance is very poor for large files and performance degradation take place with a large files. How do I tune TCP under Linux to solve this problem?
By default the Linux network stack is not configured for high speed large file transfer across WAN links. This is done to save memory resources. You can easily tune Linux network stack by increasing network buffers size for high-speed networks that connect server systems to handle more network packets.

The default maximum Linux TCP buffer sizes are way too small. TCP memory is calculated automatically based on system memory; you can find the actual values by typing the following commands:
$ cat /proc/sys/net/ipv4/tcp_mem
The default and maximum amount for the receive socket memory:
$ cat /proc/sys/net/core/rmem_default
$ cat /proc/sys/net/core/rmem_max
The default and maximum amount for the send socket memory:
$ cat /proc/sys/net/core/wmem_default
$ cat /proc/sys/net/core/wmem_max
The maximum amount of option memory buffers:
$ cat /proc/sys/net/core/optmem_max

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Tune values

Set the max OS send buffer size (wmem) and receive buffer size (rmem) to 12 MB for queues on all protocols. In other words set the amount of memory that is allocated for each TCP socket when it is opened or created while transferring files:

# echo 'net.core.wmem_max=12582912' >> /etc/sysctl.conf
# echo 'net.core.rmem_max=12582912' >> /etc/sysctl.conf

You also need to set minimum size, initial size, and maximum size in bytes:
# echo 'net.ipv4.tcp_rmem= 10240 87380 12582912' >> /etc/sysctl.conf
# echo 'net.ipv4.tcp_wmem= 10240 87380 12582912' >> /etc/sysctl.conf
Turn on window scaling which can be an option to enlarge the transfer window:
# echo 'net.ipv4.tcp_window_scaling = 1' >> /etc/sysctl.conf
Enable timestamps as defined in RFC1323:
# echo 'net.ipv4.tcp_timestamps = 1' >> /etc/sysctl.conf
Enable select acknowledgments:
# echo 'net.ipv4.tcp_sack = 1' >> /etc/sysctl.conf
By default, TCP saves various connection metrics in the route cache when the connection closes, so that connections established in the near future can use these to set initial conditions. Usually, this increases overall performance, but may sometimes cause performance degradation. If set, TCP will not cache metrics on closing connections.
# echo 'net.ipv4.tcp_no_metrics_save = 1' >> /etc/sysctl.conf
Set maximum number of packets, queued on the INPUT side, when the interface receives packets faster than kernel can process them.
# echo 'net.core.netdev_max_backlog = 5000' >> /etc/sysctl.conf
Now reload the changes:
# sysctl -p
Use tcpdump to view changes for eth0:
# tcpdump -ni eth0

Recommend readings:

• Please refer to kernel documentation in Documentation /networking/ip-sysctl.txt for more information.
• man page sysctl

Linux Tcp Auto Tuning

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