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    SubjectSystem Locks Temporarily When Untarring Large Files
    Problem to report:
    - I often decompress tar files which are several hundred megabytes big.
    - With newer 2.4.x kernels (2.4.10-14), when I am decompressing a large
    tar file, my X session locks up for about 20-30 seconds.
    - With Kernel 2.4.3, I do not recall X locking up when dealing with
    large files.

    1) Could one of my paramters for the /proc be causing this?
    2) I got the basic lines from "Optimizing and Securing RedHat Linux..."
    and customized them for my machine.
    3) Where did /proc/sys/vm/buffermem go from earlier 2.4.x kernels? What
    has it been replaced with?


    1) Here is what I use to optimize the system.

    #!/bin/sh

    check()
    {
    if [ "`whoami`" != "root" ]
    then
    echo "You must be root to use this program."
    exit
    fi
    }

    filesystem()
    {
    echo "Improving Overall Performance..."
    echo "Improving filesystem (swap) performance ................. [
    ENABLED ]"
    echo "100 1200 128 512 15 5000 500 1884 2" > /proc/sys/vm/bdflush
    #echo "Optimizing buffermem for a 1024MB configuration ......... [
    ENABLED ]" # for earlier 2.4.x kernels
    #echo "80 10 60" > /proc/sys/vm/buffermem
    echo "Optimizing the file-max for a 1024MB configuration ...... [
    ENABLED ]"
    echo "65536" > /proc/sys/fs/file-max
    }

    network()
    {
    echo "Securing network settings..."

    echo "Enable ICMP Pings ....................................... [
    ENABLED ]"
    echo "0" > /proc/sys/net/ipv4/icmp_echo_ignore_all

    echo "Disable Broadcast ICMP Packets .......................... [
    ENABLED ]"
    echo "1" > /proc/sys/net/ipv4/icmp_echo_ignore_broadcasts

    echo "Disable Source IP Routing ............................... [
    ENABLED ]"
    for i in /proc/sys/net/ipv4/conf/*/accept_source_route
    do
    echo "0" > $i
    done

    echo "Enabling SYN Cookies .................................... [
    ENABLED ]"
    echo "1" > /proc/sys/net/ipv4/tcp_syncookies

    echo "Enabling ICMP ignore on bogus error responses ........... [
    ENABLED ]"
    echo "1" > /proc/sys/net/ipv4/icmp_ignore_bogus_error_responses

    echo "Enabling IP Spoofing Protection ......................... [
    ENABLED ]"
    for i in /proc/sys/net/ipv4/conf/*/rp_filter
    do
    echo "1" > $i
    done

    echo "Enabling Logging Of Spoofed Packets ..................... [
    ENABLED ]"
    for i in /proc/sys/net/ipv4/conf/*/log_martians
    do
    echo "1" > $i
    done

    echo "Increasing Additional Port Usage ........................ [
    ENABLED ]"
    echo "32768 61000" > /proc/sys/net/ipv4/ip_local_port_range

    echo "Increasing General TCP/IP Throughput .................... [
    ENABLED ]"
    echo "30" > /proc/sys/net/ipv4/tcp_fin_timeout
    echo "1800" > /proc/sys/net/ipv4/tcp_keepalive_time
    echo "0" > /proc/sys/net/ipv4/tcp_window_scaling
    echo "0" > /proc/sys/net/ipv4/tcp_sack
    echo "0" > /proc/sys/net/ipv4/tcp_timestamps

    echo "Setting keepalive time to 4 months ...................... [
    ENABLED ]"
    echo "12157520" > /proc/sys/net/ipv4/tcp_keepalive_time

    }

    main()
    {
    check
    filesystem
    network
    }

    main

    2) My system specifications are as follows:

    System Hardware:
    CPU Type: Pentium III
    CPU Speed: 868.665 MHz
    Ram: 1005 MB
    Swap: 2000 MB

    System Software:
    Distribution: Red Hat Linux release 7.2 (Enigma)
    autoconf: 2.52
    autogen: 5.2.11
    automake: 1.5
    binutils: 2.11.2
    esound: 0.2.22
    gcc: 2.95.3
    gettext: 0.10.40
    glibc: 2.2.4
    glib: 1.2.10
    gnome-libs: 1.2.13
    gtk: 1.2.10
    imlib: 1.9.11
    kdelibs: 2.2.1
    kernel: 2.4.14
    libtool: 1.4.1
    openssl: 0.9.6b
    orbit: 0.5.8
    orbit-idl: 0.6.8
    perl: 5.6.1
    qt: 3.0.0
    rpm: 4.0.3
    sdl: 1.2.2
    xfree86: 4.1.0
    xml2: 2.4.10
    xml: 1.8.16




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