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AIX Tuning

Networking

Check the current values of the network tuning parameters:

no -a | more

or

ifconfig en0
en0:
...
        tcp_sendspace 131072 tcp_recvspace 65536 rfc1323 0

Tuning for Performance

  /usr/sbin/no -o udp_sendspace=65536
  /usr/sbin/no -o udp_recvspace=655360
  /usr/sbin/no -o tcp_sendspace=65536
  /usr/sbin/no -o tcp_recvspace=65536
  /usr/sbin/no -o rfc1323=1
  /usr/sbin/no -o sb_max=4194304
  /usr/sbin/no -o ipqmaxlen=512

File descriptors (ulimit)

Specifies the various restrictions on resource usage on the user account.

Check the change with the following command

# ulimit -a
...
open files                      (-n) 2000

Perform the following steps to change the open file limit to 10,000 files. Edit the /etc/security/limits file.

nofiles =  10000 
nofiles_hard = 10000

Save and close the file, logoff from the system, and logon again

Articles

AIX:Erro "File too large" ao realizar scp de um arquivo para o AIX

Connect:Direct for UNIX: File Transfer Performance

Tune AIX operating system for WebSphere Application Server

AIX Network Tuning for 10Ge and Virtual Network

Tuning AIX Network Performance

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