System Locks Temporarily When Untarring Large Files

System Locks Temporarily When Untarring Large Files

[war]

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

System Locks Temporarily When Untarring Large Files

[war]

Forgot to mention.

Type of Drive:
The hard drive is a 40GB IBM-DTLA-305040.

Speed of Drive:
When many apps are open I get:
Timing buffered disk reads:  64 MB in  2.55 seconds = 25.10 MB/sec
When I am in single user mode, I get 29.50MB/s.

Drive Information:
# hdparm -v /dev/hda

/dev/hda:
 multcount    = 16 (on)
 I/O support  =  1 (32-bit)
 unmaskirq    =  1 (on)
 using_dma    =  1 (on)
 keepsettings =  0 (off)
 nowerr       =  0 (off)
 readonly     =  0 (off)
 readahead    =  8 (on)
 geometry     = 5005/255/63, sectors = 80418240, start = 0

Re: System Locks Temporarily When Untarring Large Files

[Wilson]

----- Original Message -----
From: "war" <war@starband.net>
To: <linux-kernel@vger.kernel.org>
Sent: Thursday, November 15, 2001 8:53 AM
Subject: System Locks Temporarily When Untarring Large Files


> Forgot to mention.
>
> Type of Drive:
> The hard drive is a 40GB IBM-DTLA-305040.
>

That's a Deskstar 75GXP. Storage afficionados refer to it as the "Deathstar
75GXP."
I highly recommend that you run through IBM's "Drive Fitness Test", etc..
What you describe is one of the symptoms of a 75GXP about to go off the deep
end.

They accused us of suppressing freedom of expression.
This was a lie and we could not let them publish it.
-- Nelba Blandon, Nicaraguan Interior Ministry Director of Censorship

Re: System Locks Temporarily When Untarring Large Files

[Thomas Hood]

>  unmaskirq    =  1 (on)

Try switching this off.