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I'm working on linux (2.6.43.8-1.fc15.i686.PAE) and face some problem to disable auto tuning of the TCP receiver window.
I'm trying to find a given setting that would force my client to advertise a fixed receiver window. I tried to give a same given value to net.core.rmem_max (/proc/sys/net/core/rmem_max) and net.core.rmem_default (/proc/sys/net/core/rmem_default) as well as ipv4.tcp_rmem (net.ipv4.tcp_rmem) but when checking the advertised window (using wireshark) it's absolutely not changing anything....
This is for a study of TCP behavior and I would be very greatful if someone could answer me
Thanks in advance
PS: I made use of this post to tune the parameters
536
Auto-tuning is consistent throughout all variants of TCP and present in all modern operating systems. In the modern Internet the range of latencies and throughput speeds that must be accommodated is simply too large to manage statically and must be adjusted dynamically.
Like all modern operating systems Windows has receive window auto-tuning to dynamically adjust the receive buffer size to the throughput and latency of the link. Disabling this feature will definitely limit your Internet speeds. Auto-tuning is consistent throughout all variants of TCP and present in all modern operating systems.
A reader just commented on this so this is a quickie article to debunk this “tweak”. -This setting does not require a reboot. Receive Window Auto-Tuning popped up with Windows Vista and has been a feature of every Windows version since.
Like all modern operating systems Windows has receive window auto-tuning to dynamically adjust the receive buffer size to the throughput and latency of the link. Disabling this feature will definitely limit your Internet speeds.
Turn off auto-tuning of the TCP receive buffer size. On the receiver:
$ sudo sysctl net.ipv4.tcp_moderate_rcvbuf=0
Or
$ sudo echo 0 > /proc/sys/net/ipv4/tcp_moderate_rcvbuf
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