On Sun, Feb 22, 2004 at 10:48:40PM +0530, Deboo wrote:
> I have converted my partitions to ext3 but I learnt the other day while
> trying to use bdflush to make the hdd spin down, that it won't work with
> ext3 partitions ecause ext3 partitions wrrite to disk every 5 seconds, the
> journal get written I mean. Is there no way to make the hdd spin down with
> ext3? If no, then is reiser or any other kind of journalled FS work with
> bdflush? Or is there any other bdflush type utility to do this?
>
I am guessing you are using laptop mode because otherwise the kernel
flushes its buffers every 30 seconds anyway.
Is it a custom kernel or a debian one. If its a debian one, for the
moment you will need the script from 2.6 which uses the commit mount
option with a small change (it doesn't reset the value).
If its a custom kernel I can send you a patch (I am currently working
on a fix, but its in a testing phase now and it will probably be some
time before it hits the standard kernels.)
I attached a modified laptop-mode script you can use for now.
Just note that although it has options for xfs and reiserfs they won't
work for the moment as they require a patch to add the needed support
(reiserfs doesn't have the support at all at the moment and xfs is
limited to 5 minutes).
> Regards,
> Deboo
>
>
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#!/bin/sh
# start or stop laptop_mode, best run by a power management daemon when
# ac gets connected/disconnected from a laptop
#
# install as /sbin/laptop_mode
#
# Contributors to this script: Kiko Piris
# Bart Samwel
# Dax Kelson
# Original Linux 2.4 version by: Jens Axboe
parse_mount_opts () {
OPT="$1"
shift
echo "$*" | \
sed 's/.*/,&,/' | \
sed 's/,'"$OPT"'=[0-9]*,/,/g' | \
sed 's/,,*/,/g' | \
sed 's/^,//' | \
sed 's/,$//' | \
cat -
}
parse_mount_opts_wfstab () {
L_DEV=$1
shift
OPT=$1
shift
L_OPTS="$*"
PARSEDOPTS1="$(parse_mount_opts $OPT $L_OPTS)"
# Watch for a default commit/transaction in fstab
FSTAB_OPTS="$(cat /etc/fstab | sed 's/ / /g' | grep ^\ *"$L_DEV " | awk '{
print $4 }')"
if [ -z "$(echo "$FSTAB_OPTS" | grep "$OPT=")" ] ; then
# no commit/transaction option specified in fstab: set it to 0
echo "$PARSEDOPTS1,$OPT=30"
else
# commit/transaction option specified in fstab: extract the value, and
use it
echo -n "$PARSEDOPTS1,$OPT="
echo "$FSTAB_OPTS" | \
sed 's/.*/,&,/' | \
sed 's/.*,'"$OPT"'=//' | \
sed 's/,.*//' | \
cat -
fi
}
KLEVEL="$(uname -r | cut -c1-3)"
case "$KLEVEL" in
"2.4"|"2.6")
true
;;
*)
echo "Unhandled kernel version: $KLEVEL ('uname -r' = '$(uname -r)')"
exit 1
;;
esac
# Shall we remount journaled fs. with appropiate commit/transaction interval? (1=yes)
DO_REMOUNTS=1
# age time, in seconds. should be put into a sysconfig file
MAX_AGE=600
# Allowed dirty ratio, in pct. should be put into a sysconfig file as well.
DIRTY_RATIO=40
# kernel default dirty buffer age
DEF_AGE=30
DEF_UPDATE=5
DEF_DIRTY_BACKGROUND_RATIO=10
DEF_DIRTY_RATIO=40
# This is temporary: we have to read this from the kernel somewhere.
HZ=100
# hdparm spindown settings
ACAD_HD=0
BATT_HD=4
if [ ! -e /proc/sys/vm/laptop_mode ]; then
echo "Kernel is not patched with laptop_mode patch."
exit 1
fi
if [ ! -w /proc/sys/vm/laptop_mode ]; then
echo "You do not have enough privileges to enable laptop_mode."
exit 1
fi
case "$1" in
start)
# XFS counts in jiffies, the others in centisecs.
AGE=$((100*$MAX_AGE))
XFS_AGE=$(($HZ*$MAX_AGE))
echo -n "Starting laptop_mode"
echo "1" > /proc/sys/vm/laptop_mode
case "$KLEVEL" in
"2.4")
echo "30 500 0 0 $AGE $AGE 60 20 0" >
/proc/sys/vm/bdflush
;;
"2.6")
echo "$AGE" >
/proc/sys/vm/dirty_writeback_centisecs
echo "$AGE" >
/proc/sys/vm/dirty_expire_centisecs
echo "$DIRTY_RATIO" >
/proc/sys/vm/dirty_ratio
echo "$DIRTY_RATIO" >
/proc/sys/vm/dirty_background_ratio
;;
esac
if [ -d /proc/sys/vm/pagebuf ] ; then
# This only needs to be set, not reset -- it is only used when
# laptop mode is enabled.
echo $XFS_AGE > /proc/sys/vm/pagebuf/lm_flush_age
fi
if [ $DO_REMOUNTS -eq 1 ]; then
cat /etc/mtab | \
while read DEV MP FST OPTS DUMP PASS ; do
case "$FST" in
"ext3")
PARSEDOPTS="$(parse_mount_opts
commit $OPTS)"
mount $DEV -t $FST $MP -o
remount,$PARSEDOPTS,commit=$MAX_AGE
;;
"reiserfs")
PARSEDOPTS="$(parse_mount_opts
transaction $OPTS)"
mount $DEV -t $FST $MP -o
remount,$PARSEDOPTS,transaction=$MAX_AGE
;;
# No need to do anything for xfs
esac
done
fi
/sbin/hdparm -S $BATT_HD /dev/hda > /dev/null 2>&1
/sbin/hdparm -B 1 /dev/hda > /dev/null 2>&1
echo "."
;;
stop)
U_AGE=$((100*$DEF_UPDATE))
B_AGE=$((100*$DEF_AGE))
echo -n "Stopping laptop_mode"
echo "0" > /proc/sys/vm/laptop_mode
case "$KLEVEL" in
"2.4")
echo "30 500 0 0 $U_AGE $B_AGE 60 20 0" >
/proc/sys/vm/bdflush
;;
"2.6")
echo "$U_AGE" >
/proc/sys/vm/dirty_writeback_centisecs
echo "$B_AGE" >
/proc/sys/vm/dirty_expire_centisecs
echo "$DEF_DIRTY_RATIO" >
/proc/sys/vm/dirty_ratio
echo "$DEF_DIRTY_BACKGROUND_RATIO" >
/proc/sys/vm/dirty_background_ratio
;;
esac
if [ $DO_REMOUNTS -eq 1 ]; then
cat /etc/mtab | \
while read DEV MP FST OPTS DUMP PASS ; do
case "$FST" in
"ext3")
PARSEDOPTS="$(parse_mount_opts_wfstab $DEV commit $OPTS)"
mount $DEV -t $FST $MP -o
remount,$PARSEDOPTS
;;
"reiserfs")
PARSEDOPTS="$(parse_mount_opts_wfstab $DEV transaction $OPTS)"
mount $DEV -t $FST $MP -o
remount,$PARSEDOPTS
;;
# No need to do anything for xfs
esac
done
fi
/sbin/hdparm -S $ACAD_HD /dev/hda > /dev/null 2>&1
/sbin/hdparm -B 255 /dev/hda > /dev/null 2>&1
echo "."
;;
*)
echo "Usage: $0 {start|stop}"
;;
esac
exit 0
