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The cached data is "invisible" to most free ram monitors in that it is included in the reported free ram.
This is why you always hear "free ram is wasted ram blah blah blah"
I'm thinkin no ram is really wasted.
I don't think I'm a linux guru as I've never ran a linux pc.
But I've read enough that I can make sense of the numbers and their effect.
Seriously, if free ram is wasted ram then the phone would never slow down when low on ram and it wouldn't get snapply after killing a bunch of apps.
This proves that the "free ram" is actually "doing something" and if it's doing "something," then it's not really wasted, is it?
Sorry gurus, but that "wasted ram" mantra makes zero sense.
The trick is to find the free ram level (includng cache) where things start to slow down.
Anything above that won't bring any benefit and needlessly detracts from multitasking.
AFM (absolute free memory number) is what I've been calling the "lag level" where things slow down below it and anything above it brings no benefit.
To summarize: Performance degradation occurs when AFM decreases.
Which is fancy talk for: "Lag happens when free ram goes below the 'lag level'" 
So yeah... next time a guru says "free ram is wasted ram," the reply is: "Define 'free ram'."
Because if they mean free ram as reported by most apps (ie. MemFree + Buffers + Cached), they are 100% wrong.
Malo se izgubilo u dijelovima koje je autor quotao ali mislim da se otprilike da skužiti o čemu je riječ..
A sad opet konkretno.. Preko 700 mb iskorištenog rama je previše i da, tu kreće lag ali on nije posljedica free rama direktno već je nedostatak free rama uzrokovan nečim..
E tu si sad svatko treba odrediti šta mu treba a šta ne, jer nažalost touchwiz i silne samsung apps ubijaju telefon i nečega se treba riješiti.. Root, freeze, hibernate, njoy
E da, jos ovoliko mi se da na mobitelu napisati : afm kratica stoji za absolute free memory..
Izvorno postao schetz
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