Original link: http://forum.xda-developers.com/show....php?t=1621808
Okay guys, I just thought I'd give you my mod for achieving good-great battery life. This is the mod I use in Anthem™ which has given me 50+ hours on a single charge. Feel free to include it in your own ROM or whatever. Please give credit or thanks or both
First: Here is a flashable .zip of the mod that may or may not work with your ROM. I'd still advise doing it manually.Step 1
Sysctl.conf - Outdated as of 4/29/2012
Open up your ROM.zip (or whatever it's called) in 7zip (Windows) or Betterzip (OSX) and locate
sysctl.conf in /system/etc
If it's not in this directory, create it.
In your sysctl.conf file, paste the following code and save it.
#sysctl.conf file fs.nr_open=1053696; fs.inotify.max_queued_events=32000; fs.inotify.max_user_instances=256; fs.inotify.max_user_watches=10240; fs.lease-break-time=10; fs.file-max=165164; kernel.threads-max=525810; kernel.random.write_wakeup_threshold=256; kernel.random.read_wakeup_threshold=128; kernel.panic=5; kernel.sched_compat_yield=1; kernel.panic=0; kernel.panic_on_oops=1; kernel.msgmni=2048; kernel.msgmax=64000; kernel.shmmni=4096; kernel.shmall=2097152; kernel.shmmax=268435456; kernel.sem='500 512000 64 2048'; kernel.sched_features=24189; kernel.hung_task_timeout_secs=30; kernel.sched_latency_ns=18000000; kernel.sched_min_granularity_ns=1500000; kernel.sched_wakeup_granularity_ns=3000000; kernel.sched_shares_ratelimit=256000; kernel.sched_child_runs_first=0; fs.lease-break-time=10; fs.file-max=65536; net.core.wmem_max=524288; net.core.rmem_max=524288; net.core.rmem_default=262144; net.core.wmem_default=262144; net.core.optmem_max=20480; net.unix.max_dgram_qlen=50; net.ipv4.tcp_keepalive_time=900; net.ipv4.tcp_keepalive_probes=5; net.ipv4.tcp_keepalive_intvl=156; net.ipv4.tcp_timestamps=0; net.ipv4.tcp_sack=1; net.ipv4.tcp_fack=1; net.ipv4.tcp_window_scaling=1; net.ipv4.tcp_tw_recycle=1; net.ipv4.tcp_tw_reuse=1; net.ipv4.tcp_congestion_control=cubic; net.ipv4.tcp_syncookies=1; net.ipv4.conf.all.rp_filter=1; net.ipv4.conf.default.rp_filter=1; net.ipv4.tcp_synack_retries=2; net.ipv4.tcp_syn_retries=2; net.ipv4.tcp_max_syn_backlog=1024; net.ipv4.tcp_max_tw_buckets=16384; net.ipv4.icmp_echo_ignore_all=1; net.ipv4.icmp_ignore_bogus_error_responses=1; net.ipv4.tcp_no_metrics_save=1; net.ipv4.tcp_fin_timeout=15; net.ipv4.tcp_keepalive_intvl=30; net.ipv4.tcp_keepalive_probes=5; net.ipv4.tcp_keepalive_time=1800; net.ipv4.ip_forward=0; net.ipv4.conf.default.accept_source_route=0 ; net.ipv4.conf.all.accept_source_route=0; net.ipv4.conf.all.accept_redirects=0; net.ipv4.conf.default.accept_redirects=0; net.ipv4.conf.all.secure_redirects=0; net.ipv4.conf.default.secure_redirects=0; net.ipv4.udp_rmem_min=6144; net.ipv4.udp_wmem_min=6144; net.ipv4.tcp_rfc1337=1; net.ipv4.ip_no_pmtu_disc=0; net.ipv4.tcp_ecn=0; net.ipv4.route.flush=1; net.ipv4.tcp_rmem='6144 87380 524288'; net.ipv4.tcp_wmem='6144 87380 524288'; net.ipv6.conf.default.use_tempaddr=2; net.ipv6.conf.all.use_tempaddr=2; net.ipv6.conf.all.temp_prefered_lft=3600; net.ipv6.conf.default.temp_prefered_lft=3600; vm.dirty_ratio=90; vm.dirty_background_ratio=80; vm.oom_kill_allocating_task=1; vm.overcommit_memory=1; vm.page-cluster=3; vm.drop_caches=3; vm.min_free_kbytes=4096; vm.panic_on_oom=0; vm.dirty_expire_centisecs=1000; vm.dirty_writeback_centisecs=2000; vm.oom_kill_allocating_task=0; vm.vfs_cache_pressure=10; vm.min_free_order_shift=4; vm.laptop_mode=0; vm.block_dump=0;
#sysctl.conf file fs.nr_open=1053696 fs.inotify.max_queued_events=32000 fs.inotify.max_user_instances=256 fs.inotify.max_user_watches=10240 fs.lease-break-time=10 fs.file-max=165164 kernel.threads-max=525810 kernel.random.write_wakeup_threshold=256 kernel.random.read_wakeup_threshold=128 kernel.panic=5 kernel.sched_compat_yield=1 kernel.panic=0 kernel.panic_on_oops=1 kernel.msgmni=2048 kernel.msgmax=64000 kernel.shmmni=4096 kernel.shmall=2097152 kernel.shmmax=268435456 kernel.sem='500 512000 64 2048' kernel.sched_features=24189 kernel.hung_task_timeout_secs=30 kernel.sched_latency_ns=18000000 kernel.sched_min_granularity_ns=1500000 kernel.sched_wakeup_granularity_ns=3000000 kernel.sched_shares_ratelimit=256000 kernel.sched_child_runs_first=0 fs.lease-break-time=10 fs.file-max=65536 net.core.wmem_max=524288 net.core.rmem_max=524288 net.core.rmem_default=262144 net.core.wmem_default=262144 net.core.optmem_max=20480 net.unix.max_dgram_qlen=50 net.ipv4.tcp_keepalive_time=900 net.ipv4.tcp_keepalive_probes=5 net.ipv4.tcp_keepalive_intvl=156 net.ipv4.tcp_timestamps=0 net.ipv4.tcp_sack=1 net.ipv4.tcp_fack=1 net.ipv4.tcp_window_scaling=1 net.ipv4.tcp_tw_recycle=1 net.ipv4.tcp_tw_reuse=1 net.ipv4.tcp_congestion_control=cubic net.ipv4.tcp_syncookies=1 net.ipv4.conf.all.rp_filter=1 net.ipv4.conf.default.rp_filter=1 net.ipv4.tcp_synack_retries=2 net.ipv4.tcp_syn_retries=2 net.ipv4.tcp_max_syn_backlog=1024 net.ipv4.tcp_max_tw_buckets=16384 net.ipv4.icmp_echo_ignore_all=1 net.ipv4.icmp_ignore_bogus_error_responses=1 net.ipv4.tcp_no_metrics_save=1 net.ipv4.tcp_fin_timeout=15 net.ipv4.tcp_keepalive_intvl=30 net.ipv4.tcp_keepalive_probes=5 net.ipv4.tcp_keepalive_time=1800 net.ipv4.ip_forward=0 net.ipv4.conf.default.accept_source_route=0 net.ipv4.conf.all.accept_source_route=0 net.ipv4.conf.all.accept_redirects=0 net.ipv4.conf.default.accept_redirects=0 net.ipv4.conf.all.secure_redirects=0 net.ipv4.conf.default.secure_redirects=0 net.ipv4.udp_rmem_min=6144 net.ipv4.udp_wmem_min=6144 net.ipv4.tcp_rfc1337=1 net.ipv4.ip_no_pmtu_disc=0 net.ipv4.tcp_ecn=0 net.ipv4.route.flush=1 net.ipv4.tcp_rmem='6144 87380 524288' net.ipv4.tcp_wmem='6144 87380 524288' net.ipv6.conf.default.use_tempaddr=2 net.ipv6.conf.all.use_tempaddr=2 net.ipv6.conf.all.temp_prefered_lft=3600 net.ipv6.conf.default.temp_prefered_lft=3600 vm.dirty_ratio=90 vm.dirty_background_ratio=80 vm.oom_kill_allocating_task=1 vm.overcommit_memory=1 vm.page-cluster=3 vm.drop_caches=3 vm.min_free_kbytes=4096 vm.panic_on_oom=0 vm.dirty_expire_centisecs=1000 vm.dirty_writeback_centisecs=2000 vm.oom_kill_allocating_task=0 vm.vfs_cache_pressure=10 vm.min_free_order_shift=4 vm.laptop_mode=0 vm.block_dump=0
Now we need to enable it. So, navigate to /system/etc/init.d and create a file with the following code:
#!/system/bin/sh # grep sysctl /etc/init.d/* # Load /sys/etc/sysctl.conf sysctl -p
Just FYI: You don't actually need these lines:Name your file something like this 10sysctl
Code:# grep sysctl /etc/init.d/*So this would have just sufficed.Code:# Load /sys/etc/sysctl.conf
Code:#!/system/bin/sh sysctl -pIf the above code does not work for any reason, try this:
Code:#!/system/bin/sh sysctl -p /system/etc/
Save your file.
NOTE: Your ROM must support init.d. You can do this by using dsixda's android kitchen
Save your ROM and install it via recovery
you could just push the files into your current ROM and try them out.
For operating the script enter the following code in terminal emulator
su sysctl -p
If you think that init.d is being faulty, enter in terminal emulatorOR
and thenCode:su sysctl -p
What this does is manually start up sysctl.conf and then verify it with the succeeding code.Code:sysctl -a| grep vm
is outputting and just see if you experience better battery life (you should)Code:sysctl -a| grep vm
Ok, so what exactly is sysctl.conf?
The sysctl.conf is a configuration file for "sysctl" which is an interface for dynamically changing kernel parameters in the Linux OS. The configuration file contains the following elements, vm.min_free_kbytes, vm.dirty_ratio, vm.dirty_backgroud_ratio, vm.vfs_cache_pressure, vm.oom_kill_allocating_task. There are many other elements within the file, but we will be primarily focusing on these specifically (the vm prefix stands for virtual memory). The sysctl.conf file should be located in /etc (/system/etc) by default. To enable it you need your ROM to execute "sysctl -p" somewhere during the boot process (or shortly afterward). We will also be discussing how to enable it if it is not already done so. You can also run sysctl -p manually to enable it any time after the OS is started.
Now, let’s get down to what sysctl.conf does and how it works.
min free kbytes (vm.min_free_kbytes)
This is used to force the Linux VM to keep a minimum number of kilobytes free. The VM uses this number to compute a pages_min value for each lowmem zone in the system. Each lowmem zone gets a number of reserved free pages based proportionally on its size. Default is 2048kb.
dirty ratio (vm.dirty_ratio) and dirty background ratio (vm.dirty_background_ratio)
This controls how often the kernel writes data to "disk" (in our case the internal microSD system card, not the removable microSD card). When your apps write data to disk, Linux actually doesn't write the data out to the disk right away, it actually writes the stuff to system memory and the kernel handles when and how the data is actually going to be flushed to the disk. These values represent a percentage, the higher the percentage, the longer it waits to flush, the lower the percentage, the more often flushes will occur. Now remember, we are dealing with solid state storage, not the traditional disk platter and spindle. So we are actually able to delay flushes a little longer with solid state versus a traditional hard drive disk.
VFS Cache Pressure (vm.vfs_cache_pressure)
Now here is where it gets interesting! File system cache (dentry/inode) is really more important than the block cache above in dirty ratio and dirty background ratio, so we really want the kernel to use up much more of the RAM for file system cache, this will increas the performance of the system without sacrificing performance at the application level. The default value is 100, as a percentage, and what you want to do is lower the value to tell the kernel to favor the file system cache and not drop them aggressively.
oom allocating task (vm.oom_kill_allocating_task)(enable or disable, generally in Linux this value is either a "1" or a "0," representing as on or off.)
This enables or disables killing the OOM-triggering task in out-of-memory (oom) situations. If this is set to zero, or disabled, the OOM killer will scan through the entire task list and select a task based on heuristics to kill. This normally selects a rogue memory-hogging task that frees up a large amount of memory when killed. If this is set to non-zero, or enabled, the OOM killer simply kills the task that triggered the out-of-memory condition. This avoids the expensive task list scan, which can take mass amounts of time and "hang" or freeze the system.
This enables block I/O debugging when set to a nonzero value. If you want to find out which process caused the disk to spin up (see /proc/sys/vm/laptop_mode), you can gather information by setting the flag.
When this flag is set, Linux reports all disk read and write operations that take place, and all block dirtyings done to files. This makes it possible to debug why a disk needs to spin up, and to increase battery life even more. The output of block_dump is written to the kernel output, and it can be retrieved using "dmesg". When you use block_dump and your kernel logging level also includes kernel debugging messages, you probably want to turn off klogd, otherwise the output of block_dump will be logged, causing disk activity that is not normally there.
This controls overcommit of system memory, possibly allowing processes to allocate (but not use) more memory than is actually available.
0 - Heuristic overcommit handling. Obvious overcommits of address space are refused. Used for a typical system. It ensures a seriously wild allocation fails while allowing overcommit to reduce swap usage. root is allowed to allocate slighly more memory in this mode. This is the default.
1 - Always overcommit. Appropriate for some scientific applications.
2 - Don't overcommit. The total address space commit for the system is not permitted to exceed swap plus a configurable percentage (default is 50) of physical RAM. Depending on the percentage you use, in most situations this means a process will not be killed while attempting to use already-allocated memory but will receive errors on memory allocation as appropriate.
This controls the number of pages which are written to swap in a single attempt. The swap I/O size.
It is a logarithmic value - setting it to zero means "1 page", setting it to 1 means "2 pages", setting it to 2 means "4 pages", etc.
The default value is three (eight pages at a time). There may be some small benefits in tuning this to a different value if your workload is swap-intensive.
This enables or disables panic on out-of-memory feature. If this is set to 1, the kernel panics when out-of-memory happens. If this is set to 0, the kernel will kill some rogue process, by calling oom_kill().
Usually, oom_killer can kill rogue processes and system will survive. If you want to panic the system rather than killing rogue processes, set this to 1.
The default value is 0.
Panic is a system error that is detected by the kernel.
How old "dirty" data should be before the kernel considers it old enough to be written to disk. It is expressed in 100ths of a second.
This is the interval of when the writeback daemons periodically wake up and write "old" data out to disk. It is expressed in 100ths of a second.