Matt Price wrote:
> Anyone know how to tweak kupdated or the "dirty buffer" "flushing"
> time using sysctl? Unfortuantely I don't even really knwo what these
> phrases mean
> (I can sorta guess)... I tried "sysctl -a" but the output wasn't
> particularly meaningful to me, and grep -i update produced no output.
> Anyone have ideas here?
Take a look at the laptop-mode script.
What it does is basically this:
MAX_AGE=600 # 10 minutes in seconds
DIRTY_RATIO=40 # percentage of dirty pages allowed
AGE=$((100*$MAX_AGE)) # I actually don't know what unit this is ;)
# but it sould also be 10 minutes
mount -oremount,commit=$MAX_AGE # for all journaling filesystems
case "$KLEVEL" in
"2.4")
echo "1" > /proc/sys/vm/laptop_mode
echo "30 500 0 0 $AGE $AGE 60 20 0" > /proc/sys/vm/bdflush
;;
"2.6")
echo "1" > /proc/sys/vm/laptop_mode
echo "$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
in /etc/sysctl.conf this should look something like this (for 2.4.x):
vm/laptop_mode = 1
vm/bdflush = 30 500 0 0 60000 60000 60 20 0
HTH,
Mika
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