0 Replies Latest reply on Sep 25, 2013 1:40 AM by Mohan Radhakrishnan

    RHEL OS parameter tuning

    Mohan Radhakrishnan Newbie

      Hi,

                 I have collected the following linux OS parameters that can improve performance. We have a JEE JSF application. What are the linux OS parameter recommendations for tuning ? What are the characteristics of the JEE application that one considers for tuning ? So for example, java InputStream's are heavily used.

       

      We have a measure of the concurrent connections and AJP connector thread pool.

       

      Is there a way to identify if the current setting is insufficient ? This is just to justify the tuning of a particular parameter.

       

       

       

      Thanks

       

      The system file descriptor limit can be increased by setting "fs.file-max" in the file "/etc/sysctl.conf". To set the limit to 65535 use echo "fs.file-max = 65535" >> /etc/sysctl.conf

      Increase default socket send/receive buffer

       

      sysctl -w net.core.rmem_default=262144

      (default socket receive buffer)

       

       

      sysctl -w net.core.wmem_default=262144

      (default socket send buffer)

       

       

      sysctl -w net.core.rmem_max=262144

      (max socket receive buffer)

      sysctl -w net.core.wmem_max=262144

      (max socket send buffer size)

       

      /sbin/ifconfig lo mtu

      kernel.msgmni

      kernel.sem

      fs.file-max

      kernel.shmmax

      net.ipv4.tcp_max_syn_backlog