init.d script to tweak interactive governor and deadline scheduler for NX785QC8G

[cpshelley]

ONLY FOR NX785QC8G!!

I wrote this init.d script to tweak the default values of the interactive governor and switch to a tweaked deadline io scheduler. seems to improve responsiveness quite a bit, and battery life is good too. I'm at 34% batt right now with 5 hours screen on time and constant WiFi use. YMMV but feel free to try it for yourself! just place this file in /etc/init.d and change owner and group to root, then chmod 755. here is the code, script file is attached - DON'T FORGET TO REMOVE THE .TXT EXTENSION!!

#!/system/bin/sh


echo "deadline" > /sys/block/mmcblk0/queue/scheduler
chmod 444 /sys/block/mmcblk0/queue/scheduler


echo "1" > /sys/block/mmcblk0/queue/add_random
chmod 444 /sys/block/mmcblk0/queue/add_random
echo "1" > /sys/block/mmcblk0/queue/iostats
chmod 444 /sys/block/mmcblk0/queue/iostats
echo "0" > /sys/block/mmcblk0/queue/nomerges
chmod 444 /sys/block/mmcblk0/queue/nomerges
echo "0" > /sys/block/mmcblk0/queue/rotational
chmod 444 /sys/block/mmcblk0/queue/rotational
echo "1" > /sys/block/mmcblk0/queue/rq_affinity
chmod 444 /sys/block/mmcblk0/queue/rq_affinity


echo "4" > /sys/block/mmcblk0/queue/iosched/fifo_batch
chmod 444 /sys/block/mmcblk0/queue/iosched/fifo_batch
echo "1" > /sys/block/mmcblk0/queue/iosched/front_merges
chmod 444 /sys/block/mmcblk0/queue/iosched/front_merges
echo "500" > /sys/block/mmcblk0/queue/iosched/read_expire
chmod 444 /sys/block/mmcblk0/queue/iosched/read_expire
echo "3000" > /sys/block/mmcblk0/queue/iosched/write_expire
chmod 444 /sys/block/mmcblk0/queue/iosched/write_expire
echo "3" > /sys/block/mmcblk0/queue/iosched/writes_starved
chmod 444 /sys/block/mmcblk0/queue/iosched/writes_starved


echo "interactive" > /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor
chmod 444 /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor


echo "15000" > /sys/devices/system/cpu/cpufreq/interactive/above_hispeed_delay
chmod 444 /sys/devices/system/cpu/cpufreq/interactive/above_hispeed_delay
echo "0" > /sys/devices/system/cpu/cpufreq/interactive/boost
chmod 444 /sys/devices/system/cpu/cpufreq/interactive/boost
echo "60000" > /sys/devices/system/cpu/cpufreq/interactive/boostpulse_duration
chmod 444 /sys/devices/system/cpu/cpufreq/interactive/boostpulse_duration
echo "70" > /sys/devices/system/cpu/cpufreq/interactive/go_hispeed_load
chmod 444 /sys/devices/system/cpu/cpufreq/interactive/go_hispeed_load
echo "1200000" > /sys/devices/system/cpu/cpufreq/interactive/hispeed_freq
chmod 444 /sys/devices/system/cpu/cpufreq/interactive/hispeed_freq
echo "60000" > /sys/devices/system/cpu/cpufreq/interactive/min_sample_time
chmod 444 /sys/devices/system/cpu/cpufreq/interactive/min_sample_time
echo "90" > /sys/devices/system/cpu/cpufreq/interactive/target_loads
chmod 444 /sys/devices/system/cpu/cpufreq/interactive/target_loads
echo "15000" > /sys/devices/system/cpu/cpufreq/interactive/timer_rate
chmod 444 /sys/devices/system/cpu/cpufreq/interactive/timer_rate
echo "60000" > /sys/devices/system/cpu/cpufreq/interactive/timer_slack
chmod 444 /sys/devices/system/cpu/cpufreq/interactive/timer_slack

[cpshelley]

here is screenshot:

[Darkomega]

So this is another way of fixing that battery issue that doesn't require opening it?

[cpshelley]

So this is another way of fixing that battery issue that doesn't require opening it?

no, this has nothing to do with the battery issues. it'll just make your tablet feel snappier

[cpshelley]

I've actually updated this, this second script adds swap.

#!/system/bin/sh


echo "128" > /proc/sys/kernel/random/read_wakeup_threshold
echo "256" > /proc/sys/kernel/random/write_wakeup_threshold


echo "50" > /proc/sys/vm/vfs_cache_pressure
echo "90" > /proc/sys/vm/dirty_ratio
echo "70" > /proc/sys/vm/dirty_background_ratio
echo "500" > /proc/sys/vm/dirty_expire_centisecs
echo "1000" > /proc/sys/vm/dirty_writeback_centisecs


echo "512" > /sys/block/mmcblk0/queue/read_ahead_kb
chmod 444 /sys/block/mmcblk0/queue/read_ahead_kb


echo "interactive" > /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor
chmod 444 /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor


echo "15000" > /sys/devices/system/cpu/cpufreq/interactive/above_hispeed_delay
chmod 444 /sys/devices/system/cpu/cpufreq/interactive/above_hispeed_delay
echo "0" > /sys/devices/system/cpu/cpufreq/interactive/boost
chmod 444 /sys/devices/system/cpu/cpufreq/interactive/boost
echo "60000" > /sys/devices/system/cpu/cpufreq/interactive/boostpulse_duration
chmod 444 /sys/devices/system/cpu/cpufreq/interactive/boostpulse_duration
echo "70" > /sys/devices/system/cpu/cpufreq/interactive/go_hispeed_load
chmod 444 /sys/devices/system/cpu/cpufreq/interactive/go_hispeed_load
echo "1200000" > /sys/devices/system/cpu/cpufreq/interactive/hispeed_freq
chmod 444 /sys/devices/system/cpu/cpufreq/interactive/hispeed_freq
echo "60000" > /sys/devices/system/cpu/cpufreq/interactive/min_sample_time
chmod 444 /sys/devices/system/cpu/cpufreq/interactive/min_sample_time
echo "90" > /sys/devices/system/cpu/cpufreq/interactive/target_loads
chmod 444 /sys/devices/system/cpu/cpufreq/interactive/target_loads
echo "15000" > /sys/devices/system/cpu/cpufreq/interactive/timer_rate
chmod 444 /sys/devices/system/cpu/cpufreq/interactive/timer_rate
echo "60000" > /sys/devices/system/cpu/cpufreq/interactive/timer_slack
chmod 444 /sys/devices/system/cpu/cpufreq/interactive/timer_slack


echo $((1024*1024*64)) > /sys/block/zram0/disksize
mkswap /dev/block/zram0
swapon /dev/block/zram0

[Exile1975]

Re: init.d script to tweak interactive governor and deadline scheduler for NX785QC8G

I notice the second script doesn't include the scheduler tweaks. Should we only use one, or both scripts? I've been using the first one for a bit and liked it, I'm using the second one right now and it isn't quite as responsive. I'm wondering if this is the activation of zram, or lack of scheduler tweaking? Thanks!

[cpshelley]

I notice the second script doesn't include the scheduler tweaks. Should we only use one, or both scripts? I've been using the first one for a bit and liked it, I'm using the second one right now and it isn't quite as responsive. I'm wondering if this is the activation of zram, or lack of scheduler tweaking? Thanks!

only use one or the other.. I was experiencing slowdowns while performing certain filesystem operations using the first script so I removed the scheduler tweaks, but my usage patterns may differ from yours so I would definitely use whichever one feels better to you. the only difference between the two is the zram, as you noted, and the second script also adds a few lines that change the frequency of writes committed to the flash (should reduce power consumption theoretically) as well as changes to the way entropy is generated, similar to sefix and lagfix I guess.

I would not use both at once, but I did keep the different mods somewhat separated into their own blocks, so if you wanted to copy the scheduler code from the first script into the second, that would work. maybe try integrating the scheduler code from the first script into the second and then commenting out the zram lines and see if that works better for you. it all really depends on how you're using your tablet, this is just what feels best for my usage habits -- YMMV.

I'd be happy to answer any questions you have along the way though!!

[Exile1975]

Re: init.d script to tweak interactive governor and deadline scheduler for NX785QC8G

That's exactly what I decided to do after posting. I combined the two and I'll see how it runs for a little bit and report back. I suspect that the slowdowns you experienced might be from one of these two lines but I'll do a little research and experimentation and let you know if I find out anything.

echo "1" > /sys/block/mmcblk0/queue/add_random

echo "3" > /sys/block/mmcblk0/queue/iosched/writes_starved

[cpshelley]

That's exactly what I decided to do after posting. I combined the two and I'll see how it runs for a little bit and report back. I suspect that the slowdowns you experienced might be from one of these two lines but I'll do a little research and experimentation and let you know if I find out anything.

echo "1" > /sys/block/mmcblk0/queue/add_random

echo "3" > /sys/block/mmcblk0/queue/iosched/writes_starved

it may have been.. but the slowdowns were while I was torrenting and trying to make other modifications to the same filesystem, I think what was happening was too much priority was being given to the torrent client. switching back to cfq on that device seems to have alleviated the issue.

[JonathanP89]

How would i add this, i'm new to all this but can learn quick, thanks.