Develop Bugs

[REF] reserved memory tests: ~356mb visible+test2: 258mb free 201010280000HKT

just performed some tests with different reserved mem sizes (stock kernel ZSJP8) for your ref
default settings:
CONFIG_ANDROID_PMEM_MEMSIZE_PMEM=16384
CONFIG_ANDROID_PMEM_MEMSIZE_PMEM_GPU1=10240
CONFIG_ANDROID_PMEM_MEMSIZE_PMEM_ADSP=1500
CONFIG_VIDEO_SAMSUNG_MEMSIZE_FIMC0=14336
CONFIG_VIDEO_SAMSUNG_MEMSIZE_FIMC1=1024
CONFIG_VIDEO_SAMSUNG_MEMSIZE_FIMC2=12288
CONFIG_VIDEO_SAMSUNG_MEMSIZE_MFC0=36864
CONFIG_VIDEO_SAMSUNG_MEMSIZE_MFC1=36864
CONFIG_VIDEO_SAMSUNG_MEMSIZE_JPEG=5012
CONFIG_VIDEO_SAMSUNG_MEMSIZE_TEXSTREAM=10240
1/. minimum (almost) reserved mem with movie playback possible (no lag in youtube), 356mb memory, no special lags observed, opened 4 tabs in browser with lots of imgs and swfs
CONFIG_ANDROID_PMEM_MEMSIZE_PMEM=8192
CONFIG_ANDROID_PMEM_MEMSIZE_PMEM_GPU1=4096
CONFIG_ANDROID_PMEM_MEMSIZE_PMEM_ADSP=1024
CONFIG_VIDEO_SAMSUNG_MEMSIZE_FIMC0=6144
CONFIG_VIDEO_SAMSUNG_MEMSIZE_FIMC1=1024
CONFIG_VIDEO_SAMSUNG_MEMSIZE_FIMC2=6144
CONFIG_VIDEO_SAMSUNG_MEMSIZE_MFC0=29696**##
CONFIG_VIDEO_SAMSUNG_MEMSIZE_MFC1=29696**##
CONFIG_VIDEO_SAMSUNG_MEMSIZE_JPEG=3072
CONFIG_VIDEO_SAMSUNG_MEMSIZE_TEXSTREAM=2048
** min value in order to play movies = 29mb, 28mb wont play
## can be set to a lower value without movie playback, setting these with too low values caused problems, below 20mb should be ok
2/. nearly double all default values, 219mb available, didnt feel faster
EDIT 201010271843HKT: tweaking memory test2
available memory - 257.68mb
EDIT 201010280000HKT:
as to min mem usage, u'll need to (in brief):
1/. remove unneccessary apps
2/. remove startup/network chg broadcast listeners from the app - a lot of apps/services are launched at startup up or network state chg, remove them so they wont start automatically, eg gtalk, sync/feed, vold service, installd, etc
3/. kill unneccessary services & processes - i didnt use any killer since i rooted my phone, i use script to kill them since killers consume more mem
4/. i have read the source and found that only -Xmx (max mem) is included but no -Xms (initial mem), perhaps we can do something here (not done yet)
reference for 2.1 http://forum.xda-developers.com/showpost.php?p=8507031&postcount=38

It 's very useful info! thanks your test!

Can I have a guide to make these changes to my existing kernel?

Nice, able to see 356MB instead of 304!

CONFIG_ANDROID_PMEM_MEMSIZE_PMEM=8192
CONFIG_ANDROID_PMEM_MEMSIZE_PMEM_GPU1=6144
CONFIG_ANDROID_PMEM_MEMSIZE_PMEM_ADSP=1500
CONFIG_VIDEO_SAMSUNG_MEMSIZE_FIMC0=8192
CONFIG_VIDEO_SAMSUNG_MEMSIZE_FIMC1=1024
CONFIG_VIDEO_SAMSUNG_MEMSIZE_FIMC2=8192
CONFIG_VIDEO_SAMSUNG_MEMSIZE_MFC0=30720**##
CONFIG_VIDEO_SAMSUNG_MEMSIZE_MFC1=30720**##
CONFIG_VIDEO_SAMSUNG_MEMSIZE_JPEG=4096
CONFIG_VIDEO_SAMSUNG_MEMSIZE_TEXSTREAM=5012
can make one kernel for this setting? i want to test,but i don't know how to make a zimage.

These results exclude the 'blackholed' memory, right? Which means if we can find where it is used (if it is used at all) we can get even more?

Great work there. Could gain us a couple more MB of usable RAM.
The "48MB hole" is most likely used by the GSM Radio and we won't have access to it.

xos84292 said:
CONFIG_ANDROID_PMEM_MEMSIZE_PMEM=8192
CONFIG_ANDROID_PMEM_MEMSIZE_PMEM_GPU1=6144
CONFIG_ANDROID_PMEM_MEMSIZE_PMEM_ADSP=1500
CONFIG_VIDEO_SAMSUNG_MEMSIZE_FIMC0=8192
CONFIG_VIDEO_SAMSUNG_MEMSIZE_FIMC1=1024
CONFIG_VIDEO_SAMSUNG_MEMSIZE_FIMC2=8192
CONFIG_VIDEO_SAMSUNG_MEMSIZE_MFC0=30720**##
CONFIG_VIDEO_SAMSUNG_MEMSIZE_MFC1=30720**##
CONFIG_VIDEO_SAMSUNG_MEMSIZE_JPEG=4096
CONFIG_VIDEO_SAMSUNG_MEMSIZE_TEXSTREAM=5012
can make one kernel for this setting? i want to test,but i don't know how to make a zimage.
Click to expand...
Click to collapse
i'm sorry, my kernel will restart once the usb cable is unplugged, still looking for a solution....

jam3sjam3s said:
These results exclude the 'blackholed' memory, right? Which means if we can find where it is used (if it is used at all) we can get even more?
Click to expand...
Click to collapse
what blackhole r u talking about?

This is awesome! I can't wait to see a kernel with the resolved usb issue and more ram.

Yay! Finally we have experts working on the RAM issues!
BTW, is there no way to allocate memory dynamically for all these things as and when it is needed instead of reserving a set amount? Especially for the video playback stuff, it's a lot of wasted memory when you're not playing a movie / doing something graphic intensive.

Can anyone explain how to do a safe changes of this paremeters.....?
Thanks

Try 720p video capturing, encoding is hardware accelerated as well. (but might not be affected by those settings, it just needs checking)
Yes, dynamic allocation would be awesome
Those settings are accessible in source code = before compilation, so no way to change them post-startup/post-compilation ATM.
How come u got only around 100MB memory used?
I got over 140 just after startup..

This is still not 512MB as samsung promissed us! I hate this phone! I'll buy a Desire Ultra HD as soon as it's annoucned!
(just to be the first troll in this topic )
nice work though!

sztupy said:
This is still not 512MB as samsung promissed us! I hate this phone! I'll buy a Desire Ultra HD as soon as it's annoucned!
(just to be the first troll in this topic )
nice work though!
Click to expand...
Click to collapse
I don't think that the argument ever was that Samsung promised 512MB of usable RAM. It was that the amount of RAM usable out of 512MB for applications was not comparable to other phones with 512MB.
I don't want this to turn into an argument. I'm just glad that the problem is coming to fruition.

andars05 said:
I don't think that the argument ever was that Samsung promised 512MB of usable RAM. It was that the amount of RAM usable out of 512MB for applications was not comparable to other phones with 512MB.
I don't want this to turn into an argument. I'm just glad that the problem is coming to fruition.
Click to expand...
Click to collapse
You clearly either have no sense of humor or cant read

I know it was sarcastic. He was making fun of the people who wanted more RAM. I was just stating that no one (with exception of a few maybe) expected 512MB of RAM to be fully usuable. I think he misunderstood the original issue
I believe the issue was largely ignored because of this misunderstanding. It didn't help that people who expressed dissatisfaction were told to "stfu." A good portion of people were unhappy with the amount of available RAM. It wasn't that they expected to have full access to all 512MB.
I'm happy to see progress on this issue.

How are we able to change theSe values???
Sent from my SGH-T959 using XDA App

SupaDuckie said:
How are we able to change theSe values???
Sent from my SGH-T959 using XDA App
Click to expand...
Click to collapse
Any kind souls?

SupaDuckie said:
How are we able to change theSe values???
Sent from my SGH-T959 using XDA App
Click to expand...
Click to collapse
mengsuan said:
Any kind souls?
Click to expand...
Click to collapse
How about reading? Its just freakin 2 pages, not 50...

[Q] Low Ram

Is this normal?. my ram is really low and im only running what you can see?
Any advice please:fingers-crossed:

I wouldn't say that's too low. So you can sit back and relax
Sent from my One V using xda app-developers app

oh rite thanks!

Yes show me ur cached process es
Mine is alot more like 144 mb free
Sent from my One V using xda premium

View attachment 1505207
Sent from my One V using xda premium

Sorry for the late reply. I was root/s-off a friends desire for him
here it is.
EDIT:::: I have 0 ram free now!

striped121 said:
Sorry for the late reply. I was root/s-off a friends desire for him
here it is.
EDIT:::: I have 0 ram free now!
Click to expand...
Click to collapse
Reboot, delete some useless apps, close out of your programs more often.. etc
Sent from my HTC One V using xda app-developers app

that's too less mate.. i never have less than 70mb ram
even though i use SwiftKey and whats app
what i use is titanium tweaker app from the market
go to voltage set it to - 150 (for battery)
note set to - 150 only if you're oc to 1024
if higher don't do.. The phone won't respond..
then go to advance/turbocharger lmk
select megaram2
done see the difference
Sent from my One V

dude unless u play games mine always shows 144 mb, remove **** that u dont use
download this from the market
https://play.google.com/store/apps/details?id=com.rs.autorun.pro&hl=en
the paid one is awesome,but there is a free one also!, diavle the startup of junk bloatware and reboot!

4 bucks for a 87KB app? xD
Lowest ram I had was 51MB, and I use Sense 4.1. I would say using task killers help if your one of them people who want to see your ram high. If your device feels sluggish after use, use a task killer, or reboot.
I'm sure CM has that low mem problem though ither way. I saw someone posting bugs about it.
Sent from my HTC One V using Tapatalk 2

Curiousn00b said:
4 bucks for a 87KB app? xD
Lowest ram I had was 51MB, and I use Sense 4.1. I would say using task killers help if your one of them people who want to see your ram high. If your device feels sluggish after use, use a task killer, or reboot.
I'm sure CM has that low mem problem though ither way. I saw someone posting bugs about it.
Sent from my HTC One V using Tapatalk 2
Click to expand...
Click to collapse
use the free version then!

Suppose ill just ignore it then as my phone is smooth and fast anyhow. just curiious to why really. it's at about 70 now on average.

striped121 said:
Suppose ill just ignore it then as my phone is smooth and fast anyhow. just curiious to why really. it's at about 70 now on average.
Click to expand...
Click to collapse
i said it numerous times... android is NOT windows. your free ram in linux => your system fails to work. your free ram in windows => you can open up more programs until the ram is full.
in linux it is better to have the whole ram full, not free. if you want more infos, you can search on the net.
When an Android app is no longer in use, the system will automatically suspend it in memory - while the app is still technically "open," suspended apps consume no resources (e.g. battery power or processing power) and sit idly in the background until needed again. This has the dual benefit of increasing the general responsiveness of Android devices, since apps don't need to be closed and reopened from scratch each time, but also ensuring background apps don't waste power needlessly
Click to expand...
Click to collapse
and
Android manages the apps stored in memory automatically: when memory is low, the system will begin killing apps and processes that have been inactive for a while, in reverse order since they were last used (i.e. oldest first). This process is designed to be invisible to the user, such that users do not need to manage memory or the killing of apps themselves.[65] However, confusion over Android memory management has resulted in third-party task killers becoming popular on the Google Play store; these third-party task killers are generally regarded as doing more harm than good.
Click to expand...
Click to collapse
source: Wikipedia

1ceb0x said:
i said it numerous times... android is NOT windows. your free ram in linux => your system fails to work. your free ram in windows => you can open up more programs until the ram is full.
in linux it is better to have the whole ram full, not free. if you want more infos, you can search on the net.
and
source: Wikipedia
Click to expand...
Click to collapse
Thanks for giving everyone who isn't aware some knowledge :highfive:Getting tired of these kinds of topics.
"More doesn't always mean better"

1ceb0x said:
i said it numerous times... android is NOT windows. your free ram in linux => your system fails to work. your free ram in windows => you can open up more programs until the ram is full.
in linux it is better to have the whole ram full, not free. if you want more infos, you can search on the net.
and
source: Wikipedia
Click to expand...
Click to collapse
but 1ce keeping them in the memory drains battery also right? so i prefer just remove some bloatware auto start aps

rockstar_26 said:
Thanks for giving everyone who isn't aware some knowledge :highfive:Getting tired of these kinds of topics.
"More doesn't always mean better"
Click to expand...
Click to collapse
if your tired of these kind of topics then simply dont read them.
I Thank you for the info and understand perfectly now as i've never used linux prior to android annd never wanted to.

cybervibin said:
but 1ce keeping them in the memory drains battery also right? so i prefer just remove some bloatware auto start aps
Click to expand...
Click to collapse
wrong. they remain in memory but they will not consume anything. that's what cache memory means.

1ceb0x said:
wrong. they remain in memory but they will not consume anything. that's what cache memory means.
Click to expand...
Click to collapse
I am backig up everything Ice wrote above...
Also if you need auto start manager(free) go check this two https://play.google.com/store/apps/...1bGwsMSwxLDEsImltb2JsaWZlLnRvb2xib3guZnVsbCJd
https://play.google.com/store/apps/...wxLDEsImNvbS5qcnVtbXkubGliZXJ0eS50b29sYm94Il0.
Much more then just auto start managers..enjoy

Whats using all of our ram?

I have been trying to figure out why the Note has so little of the 3 gb of ram available at any given time. After a fresh boot, I might have 1.3 - 1.5 available, but that quickly disappears.
I have frozen all unnecessary apps with Titanium Backup, yet after launching just a few apps, I'll be down to 300 mb or so. Looking at the active applications list in task manager, the apps listed are nowhere near to adding up to over a gb of ram.
Tablet seems to be performing fine, I'd just like to know where the ram is going and why. Especially when tablets with 2 gb of ram seem to have much more free at any given time.
Sent from my SM-P600 using Tapatalk

i am with you on this issue. would like to find out for my self as well! constantly having to clear ram.
youtube, gmail, and browers = 2.1 gb / 3 gb ...
what the heck?
i constantly have to go back and clear apps, this is such a let down because my htc one could load much more than this, and every1 knows, htc one is no where near the spec of note 2014..

I'm not rooted but I noticed the same thing with the ram, I thought rooting and freezing some Samsung apps, specially Knox stuff, would free up a lot of ram. I'm starting to think that it's not a big deal and Android frees up ram as needed before it starts to get laggy (of course it's not perfect). I think lag issues are somewhere else and not so much in freeing up more ram. Don't you feel anyway that your note is a lot faster after rooting and freezing those apps? As far as I know most rooted users feel that way...(?)
Sent from my SM-P600 using XDA Premium 4 mobile app

I have rooted mine about two weeks ago then froze all sort of junk listed in here and some other I identified mysefl. Now my used ram remains around 500 clean and around 700-800 when I open few apps. So guys the secret is getting a lot of useless apps frozen especially knox stuff.

greyhulk said:
I have been trying to figure out why the Note has so little of the 3 gb of ram available at any given time. After a fresh boot, I might have 1.3 - 1.5 available, but that quickly disappears.
I have frozen all unnecessary apps with Titanium Backup, yet after launching just a few apps, I'll be down to 300 mb or so. Looking at the active applications list in task manager, the apps listed are nowhere near to adding up to over a gb of ram.
Tablet seems to be performing fine, I'd just like to know where the ram is going and why. Especially when tablets with 2 gb of ram seem to have much more free at any given time.
Sent from my SM-P600 using Tapatalk
Click to expand...
Click to collapse
Android is based on Linux. Android and Linux both run better when they use as much ram as possible. If you Google Android ram usage you can find a couple of interesting articles about this.
Sent from my SM-P600 using XDA Premium HD app

nrage23 said:
Android is based on Linux. Android and Linux both run better when they use as much ram as possible. If you Google Android ram usage you can find a couple of interesting articles about this.
Sent from my SM-P600 using XDA Premium HD app
Click to expand...
Click to collapse
Yup, stuff is kept in the RAM as much as possible to increase performance. As soon as an app requires more RAM than is available, the system moves apps from the RAM as required. Clearing the RAM only increases the time it takes to start an app next time.

I would be disappointed if its NOT beeing used...
Sent from my GT-I9300 using XDA Premium 4 mobile app

delanvital said:
Yup, stuff is kept in the RAM as much as possible to increase performance. As soon as an app requires more RAM than is available, the system moves apps from the RAM as required. Clearing the RAM only increases the time it takes to start an app next time.
Click to expand...
Click to collapse
People are used to Windows needing free ram and do realize that Linux is a completely different animal altogether.
Here is the article for those that want to understand the ram usage.
http://www.androidcentral.com/ram-what-it-how-its-used-and-why-you-shouldnt-care
http://www.linuxatemyram.com/

Okay, guys. Disclaimer: I'm an IT professional and the Mobility expert for my company. I know how the RAM is used and why. I'm just curious as to what is using it. Especially in comparison to the Nexus 10, which has 2/3 of the RAM and has approximately the same amount available at any given time.
I wasn't looking for assurance that this is how it's supposed to work. I'm curious as to what you guys think is actually filling it up. Since I have disabled most unnecessary processes and only run a few apps at any given time, I can't see why so little is free.

greyhulk said:
... I'm curious as to what you guys think is actually filling it up. Since I have disabled most unnecessary processes and only run a few apps at any given time, I can't see why so little is free.
Click to expand...
Click to collapse
The objective of good android RAM management is to keep RAM full of the the highest priority apps. This enables faster and smoother response. The apps that are in RAM on your device will be different than on someone else's device. If you are curious about how android decides what put in RAM and what to take out, do a google search on "android process lifecycle"

if you're concerned about ram usage go to dev settings and change the "Limit background processes" to something more you liking.

Using a lot of RAM... for some reason?

Ok so I was running an app to check on CPU speeds (unrelated research) when I noticed that this same app was saying I only had 340mb of RAM free...
This seemed a bit strange, considering this tablet has 3GB of RAM on board, and I'm not really running anything at the moment.
I went into the storage setting page, and looked at running processes, and it says that I am using 2.5GB of my RAM.
but... if I add up all the ram usage on all the running processes, it only adds up to about 500mb....
So what is using up the other 2gb?
If anyone has any suggestions, it'd be nice, as at the moment it seems I only have 1gb of usable RAM in this device...
EDIT:
Nevermind, I think I solved it... sort of. I found that the ram clearing button is in a different place than I remember, and I have managed to clear out some more space... though even after a full reset 1.5gb of ram is immediately being used. Seems a lot.
Though this is a stock rom etc so I suspect thats normal.

electrical tcfpain
nirurin said:
Ok so I was running an app to check on CPU speeds (unrelated research) when I noticed that this same app was saying I only had 340mb of RAM free...
This seemed a bit strange, considering this tablet has 3GB of RAM on board, and I'm not really running anything at the moment.
I went into the storage setting page, and looked at running processes, and it says that I am using 2.5GB of my RAM.
but... if I add up all the ram usage on all the running processes, it only adds up to about 500mb....
So what is using up the other 2gb?
If anyone has any suggestions, it'd be nice, as at the moment it seems I only have 1gb of usable RAM in this device...
EDIT:
Nevermind, I think I solved it... sort of. I found that the ram clearing button is in a different place than I remember, and I have managed to clear out some more space... though even after a full reset 1.5gb of ram is immediately being used. Seems a lot.
Though this is a stock rom etc so I suspect thats normal.
Click to expand...
Click to collapse
You probably aren't using all 2.5GB for actual running programs.
Windows 7 does a great job of managing money. If it has any unused memory it will hold often used programs or data in memory in case it's needed. If a running program needs that memory it's quickly shifted. Otherwise when you reopen that program you recently closed, it may load quickly from memory rather than from the drive. I suspect Android does things similar.
Modern systems programmers consider "free" memory to be wasted, so they put it to the best use they can anticipate. That gives you the benefit of all memory as often as possible. If they only allowed the memory to be used for what's needed right now, your Note would only have about 1 GB memory, and would be considerably slower.
It's a little like having the cook wash your car while waiting three hours for the turkey to cook. You get both the turkey and the car wash.

jnichols2 said:
You probably aren't using all 2.5GB for actual running programs.
Windows 7 does a great job of managing money. If it has any unused memory it will hold often used programs or data in memory in case it's needed. If a running program needs that memory it's quickly shifted. Otherwise when you reopen that program you recently closed, it may load quickly from memory rather than from the drive. I suspect Android does things similar.
Modern systems programmers consider "free" memory to be wasted, so they put it to the best use they can anticipate. That gives you the benefit of all memory as often as possible. If they only allowed the memory to be used for what's needed right now, your Note would only have about 1 GB memory, and would be considerably slower.
It's a little like having the cook wash your car while waiting three hours for the turkey to cook. You get both the turkey and the car wash.
Click to expand...
Click to collapse
I'm guessing you mean android, not windows 7
Though I imagine both do the same thing lol

nirurin said:
I'm guessing you mean android, not windows 7
Though I imagine both do the same thing lol
Click to expand...
Click to collapse
I used Windows 7 as an example because I know how it works. Like you, I imagine Android 4.3 does the same thing.

I was wondering about this as well. On my Note 2, when I clean the ram, it will go to 480-500 / 1.75g on this tab, ext I could get is 1.33/2.75.......
I went through and turned off a lot of the apps, it helped free up a little bit.
Does anyone have a list of the apps that are safe to turn off?
:beer:
Sent from my SM-P600 using Xparent Cyan Tapatalk 2

I have LTE version with Snapdragon and when I start the tablet, it uses about 890MB of 2,35GB available (yes, it has 3GB RAM, but graphic processor uses some of this RAM)... When it loads all apps to RAM (about 50 of them, we know android do this) and I start few apps(FB, Gmail, Chrome, Hangouts for example), I still use only about 1,3GB of RAM... So almost 1GB is still free

In Android having too much free ram is not a good thing. Let your apps use it, you don't have to worry about not having enough ram, OS manages it well for you.

ddavtian said:
In Android having too much free ram is not a good thing. Let your apps use it, you don't have to worry about not having enough ram, OS manages it well for you.
Click to expand...
Click to collapse
+1
Android is a mobile OS which means that it can backup and restore not needed apps if necessary and the 3GB are only the runtime memory beside this it can use the whole internal memory for "running" apps. So long Android got enough memory it holds all apps in memory which speed up the whole device. Therefore it is positive that the Note use his whole 3GB memory and don't think that killing apps or free memory will be a good idea. It will slow your device and produce lags.

ddavtian said:
In Android having too much free ram is not a good thing. Let your apps use it, you don't have to worry about not having enough ram, OS manages it well for you.
Click to expand...
Click to collapse
Elim said:
+1
Android is a mobile OS which means that it can backup and restore not needed apps if necessary and the 3GB are only the runtime memory beside this it can use the whole internal memory for "running" apps. So long Android got enough memory it holds all apps in memory which speed up the whole device. Therefore it is positive that the Note use his whole 3GB memory and don't think that killing apps or free memory will be a good idea. It will slow your device and produce lags.
Click to expand...
Click to collapse
They are both right. Android is based on linux. Linux uses ram very effectively to cache apps and data to speed up your system. When something needs ram it removes a different app or data from the ram to keep moving. It works totally different from Windows. Check out this article.
http://www.androidcentral.com/ram-what-it-how-its-used-and-why-you-shouldnt-care

Every day since Android came out someone asks this question somewhere... Is Google offline?
Sent from my SM-P605 using XDA Premium HD app

If you want to change how your ram is managed, and you have root, you can use the v6 supercharger or a simple minfree setting app. V6 is in the developer section of the general android forum on this site. I've found that m ram fills up from cached apps. V6 will let you auto clear however often you want.

High memory being use

After installed few apps to the new oppo find 7a, the memory in use constantly stay at over 1GB and only 300-400MB available. anyone else has the similar issue? even close all the recent apps doesn't seem to increase the memory available. is it ROM/OS related issue?

I got 1,23Go RAM used for 542Mo available after clearing recent apps.

This is a common misconception, but on Android unused memory is wasted memory. It's good to have that being used by Android daemons running in the background as it speeds up processes and user experience.
I'd say don't worry about.

seanpr123 said:
This is a common misconception, but on Android unused memory is wasted memory. It's good to have that being used by Android daemons running in the background as it speeds up processes and user experience.
I'd say don't worry about.
Click to expand...
Click to collapse
thanks for the reply. it's just my OCD...i always wanna see more memory available than in use...

Just as Sean said, unused ram is useless ram.
It's all about access speed, the more data you store in ram the more content is quickly available.
Flash memory has an average transfer rate of 5 to 7mb/s while ram has an average transfer rate of several gb/s.
The difference in speed here is very noticeable and the main reason why recent android versions (or Linux in general) caches so much data in ram.
Long story short, the more ram is in use, the faster your phone gets.
400mb is basically the safety threshold that it keeps unoccupied just to be sure it has some left in case of an emergency (you trying to open content that isn't already cached).
Gesendet von meinem MI 2 mit Tapatalk

seanpr123 said:
This is a common misconception, but on Android unused memory is wasted memory. It's good to have that being used by Android daemons running in the background as it speeds up processes and user experience.
I'd say don't worry about.
Click to expand...
Click to collapse
If I don't reboot my Xperia Z for a few days it ends up with like 170mb of free ram and loses its power to multi task and the phone because laggy as hell lol >_>

That's a different issue I would say.
The services occupying the ram should give up caching memory once a newcomer requires ram.
This changes nothing about the fact that, if it's done right, caching is the way to go.
Probably a bugged software component rather than an broken ideal.
Sent from my X9006 using Tapatalk

MrColdbird said:
That's a different issue I would say.
The services occupying the ram should give up caching memory once a newcomer requires ram.
This changes nothing about the fact that, if it's done right, caching is the way to go.
Probably a bugged software component rather than an broken ideal.
Sent from my X9006 using Tapatalk
Click to expand...
Click to collapse
after 2-3 days of use, i find that the free (unused) RAM are actually not a problem, doesn't matter there is 300MB left or 600MB left, i can hardly tell the difference. but the most important thing is, the experience is very smooth and running well, no laggy. i'm actually very impressed. i think OPPO did a great job on managing background apps and optimizing user experience on the find 7a here!