[CM7][CM9]Speed and Smoothness Tweaks

I have posted this in development, but thought General may be a better place for me peeps to see...YMMV!!!

SO...I wanted to give some performance enhancments that i have implemented on my NC. These have come from settings I have tweaked on my Epic 4G, that have seemed to GREATLY improve the smoothness and increased my wifi speeds. The first set of tweaks come courtesy of marcusant. His thread can be found here In the Epic 4G forums http://xdaforums.com/show....php?t=1346680 This is to be copied into the sysctl.conf file located in /system/etc/. If its not there just create it.

net.ipv4.tcp_ecn=0
net.ipv4.route.flush = 1
net.ipv4.tcp_rfc1337 = 1
net.ipv4.ip_no_pmtu_disc = 0
net.ipv4.tcp_sack = 1
net.ipv4.tcp_fack = 1
net.ipv4.tcp_window_scaling = 1
net.ipv4.tcp_timestamps = 1
net.ipv4.tcp_rmem = 4096 39000 187000
net.ipv4.tcp_wmem = 4096 39000 187000
net.ipv4.tcp_mem = 187000 187000 187000
net.ipv4.tcp_no_metrics_save = 1
net.ipv4.tcp_moderate_rcvbuf = 1


The first 4 tests in the attachment were prior to this tweak on CM9.

The next set of tweaks is courtesy of this thread http://xdaforums.com/show...42047&page=439.

In Rom Toolbox (Note: to make changes using ROM Toolbox, you will need to purchase the pro version) I also changed some other settings as follows:
Under Kernel Tweaks, sysctl Conf:
Min Free: 4096
Dirty Ratio: 90
Background Ratio: 70
VFS Cache: 1
Oom Kill is checked

Under build.prop tweaks:
LCD: 240 (this is not used for the NC)
Ring Delay: 0 (this is not used for the NC)
VM Heap: 32m
Scan Interval: 300
Max Events: 150 (this is not used for the NC)

Under Auto Memory Manager:
Foreground: 6 MB
Visible: 8 MB
Secondary: 16 MB
Hidden: 30MB
Content: 40 MB
Empty: 50 MB

SD Boost value is at 4096 kb

And the changes to build.prop that I got from Biggoron:

Change:
davlik.vm.heapsize=92m (should originally be 32m)

Add: (these do not exist and must be manually added)
davlik.vm.heapstartsize=5m
davlik.vm.heapgrowthlimit=32m (thanks Bigoron)

I take NO credit for these tweaks, and no responsibility if it melts your NC! But I have found these tweaks to bring a HUGE improvement to my NC.

Also, my performance settings for CM9 are:
Governor: InteractiveX
CPU Steps: 300, 600, 825, 1100, 1300
All at stock voltages.

Good luck and let me know any results or changes that may work better!

Here's what I'm trying now, hopefully deals with the crashes:

build.prop:
wifi.supplicant_scan_interval=300
davlik.vm.heapsize=92m
davlik.vm.heapstartsize=5m
davlik.vm.heapgrowthlimit=32m

sysctl.conf:
# Changes added for network tweaking
net.ipv4.tcp_ecn=0
net.ipv4.route.flush = 1
net.ipv4.tcp_rfc1337 = 1
net.ipv4.ip_no_pmtu_disc = 0
net.ipv4.tcp_sack = 1
net.ipv4.tcp_fack = 1
net.ipv4.tcp_window_scaling = 1
net.ipv4.tcp_timestamps = 1
net.ipv4.tcp_rmem = 4096 39000 187000
net.ipv4.tcp_wmem = 4096 39000 187000
net.ipv4.tcp_mem = 187000 187000 187000
net.ipv4.tcp_no_metrics_save = 1
net.ipv4.tcp_moderate_rcvbuf = 1

# Changes added for virtual memory tweaking
vm.min_free_kbytes = 4096
vm.dirty_ratio = 90
vm.dirty_background_ratio = 55
vm.vfs_cache_pressure = 20
vm.oom_kill_allocating_task = 1

and run the V6 Supercharger for the minfree settings (option 9)

adamdelozier said:

This is to be copied into the sysctl.conf file located in /system/etc/. If its not there just create it.

net.ipv4.tcp_ecn=0
net.ipv4.route.flush = 1
net.ipv4.tcp_rfc1337 = 1
net.ipv4.ip_no_pmtu_disc = 0
net.ipv4.tcp_sack = 1
net.ipv4.tcp_fack = 1
net.ipv4.tcp_window_scaling = 1
net.ipv4.tcp_timestamps = 1
net.ipv4.tcp_rmem = 4096 39000 187000
net.ipv4.tcp_wmem = 4096 39000 187000
net.ipv4.tcp_mem = 187000 187000 187000
net.ipv4.tcp_no_metrics_save = 1
net.ipv4.tcp_moderate_rcvbuf = 1

Click to expand...

Click to collapse

That can easily be done with a script. Maybe I will try my hand at it and see how it works.

FWIW, I plan to research some of this and determine precisely what it is doing besides the default. I did a lot of this kind of work with a linux networking appliance that I developed for at my last job.

In Rom Toolbox (Note: to make changes using ROM Toolbox, you will need to purchase the pro version) I also changed some other settings as follows:
Under Kernel Tweaks, sysctl Conf:

Min Free: 4096
Dirty Ratio: 90
Background Ratio: 70
VFS Cache: 1
Oom Kill is checked

Click to expand...

Click to collapse

These are also in sysctl.conf. You could just add these lines, in addition to the ones you listed above:

vm.min_free_kbytes = 4096
vm.dirty_ratio = 90
vm.dirty_background_ratio = 70
vm.vfs_cache_pressure = 1
vm.oom_kill_allocating_task = 1

Under build.prop tweaks:
LCD: 240 (this is not used for the NC)
Ring Delay: 0 (this is not used for the NC)
VM Heap: 32m
Scan Interval: 300
Max Events: 150 (this is not used for the NC)

Click to expand...

Click to collapse

These can be done by editing build.prop manually.

you want:

dalvik.vm.heapsize=32m
wifi.supplicant_scan_interval=300

(you say the others are not used)

Under Auto Memory Manager:
Foreground: 6 MB
Visible: 8 MB
Secondary: 16 MB
Hidden: 30MB
Content: 40 MB
Empty: 50 MB

SD Boost value is at 4096 kb

Click to expand...

Click to collapse

These, I am guessing, are similar or in the similar vein as the V6Supercharger script.

And the changes to build.prop that I got from Biggoron:

Change:
davlik.vm.heapsize=92m (should originally be 32m)

Add: (these do not exist and must be manually added)
davlik.vm.heapstartsize=5m
davlik.vm.heapgrowthlimit=32m (thanks Bigoron)

Click to expand...

Click to collapse

Note the heapsize 92m is an overwrite of your other suggested setting from above.

Also, my performance settings for CM9 are:
Governor: InteractiveX
CPU Steps: 300, 600, 825, 1100, 1300
All at stock voltages.

Click to expand...

Click to collapse

In my guide, I shared my settings which are similar, but I don't go past 1200. Tweaking the voltages down will probably improve your battery life.

I am going to try the tweaks for build.prop and sysctl.conf.

Well, most of the sysctl.conf and build.prop stuff is included in the ROM, and furthermore will likely be overwritten when you update the ROM, I would think.

And while I really like the V6Spercharger script, I think combining just the things it does for Nook Color, along with some of these things that make sense, all into one script, would really help. I might try my hand at this and see how it goes. This is all routine stuff for shell scripts.

I don't know if they are loaded on boot. I will look into it once I get some time.

On a slightly different note, I have gone a full day with the settings above without a crash, which is about 3x as long as it went before. The vm.dirty_background_ratio = 55 and vm.vfs_cache_pressure = 20 seem to be the difference maker, so far.