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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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