Sun Java System Application Server Enterprise Edition 8.1 2005Q2 Performance Tuning Guide

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# Linux Configuration

The following parameters must be added to the `/etc/rc.d/rc.local` file that gets executed during system start-up.

    <-- begin
    #max file count updated ~256 descriptors per 4Mb.
    Specify number of file descriptors based on the amount of system RAM.
    echo "6553" > /proc/sys/fs/file-max
    #inode-max 3-4 times the file-max
    #file not present!!!!!
    #echo"262144" > /proc/sys/fs/inode-max
    #make more local ports available
    echo 1024 25000 > /proc/sys/net/ipv4/ip_local_port_range
    #increase the memory available with socket buffers
    echo 2621143 > /proc/sys/net/core/rmem_max
    echo 262143 > /proc/sys/net/core/rmem_default
    #above configuration for 2.4.X kernels
    echo 4096 131072 262143 > /proc/sys/net/ipv4/tcp_rmem
    echo 4096 13107262143 > /proc/sys/net/ipv4/tcp_wmem
    #disable "RFC2018 TCP Selective Acknowledgements," and
    "RFC1323 TCP timestamps" echo 0 > /proc/sys/net/ipv4/tcp_sack
    echo 0 > /proc/sys/net/ipv4/tcp_timestamps
    #double maximum amount of memory allocated to shm at runtime
    echo "67108864" > /proc/sys/kernel/shmmax
    #improve virtual memory VM subsystem of the Linux
    echo "100 1200 128 512 15 5000 500 1884 2" > /proc/sys/vm/bdflush
    #we also do a sysctl
    sysctl -p /etc/sysctl.conf
    -- end -->

Additionally, create an `/etc/sysctl.conf` file and append it with the following values:

    <-- begin
     #Disables packet forwarding
    net.ipv4.ip_forward = 0
    #Enables source route verification
    net.ipv4.conf.default.rp_filter = 1
    #Disables the magic-sysrq key
    kernel.sysrq = 0
    fs.file-max=65536
    vm.bdflush = 100 1200 128 512 15 5000 500 1884 2
    net.ipv4.ip_local_port_range = 1024 65000
    net.core.rmem_max= 262143
    net.core.rmem_default = 262143
    net.ipv4.tcp_rmem = 4096 131072 262143
    net.ipv4.tcp_wmem = 4096 131072 262143
    net.ipv4.tcp_sack = 0
    net.ipv4.tcp_timestamps = 0

kernel.shmmax = 67108864

For further information on tuning Solaris systems see the Solaris Tunable Parameters Reference Manual.

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