在AIX下為Oracle調整網路引數

2.4.3 Configure Network Tuning Parameters

Verify that the network tuning parameters shown in the following table are set to the values shown or higher values. The procedure following the table describes how to verify and set the values.

To view the current value specified for these parameters, and to change them if necessary:

1. To check the current values of the network tuning parameters, enter commands similar to the following:

   # /usr/sbin/no -a | more
   
   

2. If you must change the value of any parameter, then enter the following command to determine whether the system is running in compatibility mode:

   # /usr/sbin/lsattr -E -l sys0 -a pre520tune
   
   

   If the system is running in compatibility mode, then the output is similar to the following, showing that the value of the pre520tune attribute is enable:

   pre520tune enable Pre-520 tuning compatibility mode True
   
   

3. If the system is running in compatibility mode, then follow these steps to change the parameter values:

   1. Enter commands similar to the following to change the value of each parameter:

      # /usr/sbin/no -o parameter_name=value 

      For example:

      # /usr/sbin/no -o udp_recvspace=655360
      
      

   2. Add entries similar to the following to the /etc/rc.net file for each parameter that you changed in the previous step:

      if [ -f /usr/sbin/no ] ; then
         /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=2*655360
         /usr/sbin/no -o ipqmaxlen=512
      fi
      
      

      By adding these lines to the /etc/rc.net file, the values persist when the system restarts.

4. If the system is not running in compatibility mode, then enter commands similar to the following to change the parameter values:

   • ipqmaxlen parameter:

     /usr/sbin/no -r -o ipqmaxlen=512
     
     

   • Other parameter:

     /usr/sbin/no -p -o parameter=value 

   Note:

   If you modify the ipqmaxlen parameter, then you must restart the system.

   These commands modify the /etc/tunables/nextboot file, causing the attribute values to persist when the system restarts.

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