MATLAB Linux tcpip buffer overflow

Hello,

I write a client in MATLAB based on tcpip object witch connect to a 3rf party server based on socket. all run on Windows and Linux.

• On Windows, internal buffer seem very big or infinite. The standard TCP/IP ACK is receive correctly. The basic/standard tcp/ip mecanisme work well
• On Linux, internal buffer seem to be 64 Ko. and ACK is sended anyway if the buffer is saturated so i can flood it quicly !!!

Can someone tell me how to increase this buffer size ? It's a Java parameters ?

Thanks to help

Answer 1

[Jason Ross]

Google around for your Linux distribution as to how to increase TCP/IP buffer size. It's likely configured in a file in /etc, and you'll likely need root permission to do it.

[Eric]

Hello Jason,

Thanks for help me.

I already check if a buffer is limiter to 64 Ko but all seem large enougth, what do you think about ? do i need to increase a value ?

eric@devboard:~$ cat /proc/sys/net/core/rmem_default

112640

eric@devboard:~$ cat /proc/sys/net/core/rmem_max

131071

eric@devboard:~$ cat /proc/sys/net/core/wmem_default

112640

eric@devboard:~$ cat /proc/sys/net/core/wmem_max

131071

eric@devboard:~$ cat /proc/sys/net/ipv4/tcp_window_scaling

1

eric@devboard:~$ cat /proc/sys/net/ipv4/tcp_sack

1

eric@devboard:~$ cat /proc/sys/net/ipv4/tcp_fack

1

eric@devboard:~$ cat /proc/sys/net/ipv4/tcp_timestamps

1

eric@devboard:~$ cat /proc/sys/net/ipv4/tcp_mem

81312 108416 162624

eric@devboard:~$ cat /proc/sys/net/ipv4/tcp_wmem

4096 16384 3469312

eric@devboard:~$ cat /proc/sys/net/ipv4/tcp_rmem

4096 87380 3469312

eric@devboard:~$ cat /proc/sys/net/ipv4/tcp_low_latency

0

Another thanks

[Eric]

Jason,

To be more clear, here is the video show difference beetween Linux and Windows :

http://niobium.iav.ch/matlab/tcpnoflood.flv (Win32)

http://niobium.iav.ch/matlab/tcpflood.flv (Linux)

64 Ko "65536 bytes" is the "clear" limit... i hop this parameters can be change

Thanks in advance