desktop io init script

Installation (openSUSE 12.1, 12.2, systemd):

place in /etc/init.d/pm_desktop_io_performance
chmod +rx /etc/init.d/pm_desktop_io_performance
systemctl enable pm_desktop_io_performance.service

Installation (other, System-V):

place in /etc/init.d/pm_desktop_io_performance
chmod +rx /etc/init.d/pm_desktop_io_performance
chkconfig pm_desktop_io_performance on


Script:

#!/bin/bash
#
# Author: Peter Maloney
#
### BEGIN INIT INFO
# Provides: pm_desktop_io_performance
# Required-Start:
# Required-Stop:
# Default-Start: 3 5
# Default-Stop: 0 1 2 6
# Description: Set the IO scheduling and queue for better desktop responsiveness, at a small cost of overall bandwidth performance
### END INIT INFO

sched=deadline
nr_requests=8

if [ -z "$verbose" ]; then
    verbose=0
fi

for d in /dev/sd[a-z]; do
    name=$(basename $d)
    if [ "$verbose" != 0 ]; then
        echo "============"
        echo "Disk $name"
        echo "============"

        echo "Old settings:"
        echo -n "    scheduler: "
        cat /sys/block/$name/queue/scheduler
        echo -n "    nr_requests: "
        cat /sys/block/$name/queue/nr_requests
    fi

    echo "$sched" > /sys/block/$name/queue/scheduler
    echo "$nr_requests" > /sys/block/$name/queue/nr_requests

    if [ "$verbose" != 0 ]; then
        echo "New settings:"
        echo -n "    scheduler: "
        cat /sys/block/$name/queue/scheduler
        echo -n "    nr_requests: "
        cat /sys/block/$name/queue/nr_requests

        echo
    fi
done