updating the memory manager to include demand paging just alters teh way the phone allocates memory to applications, as well as how some of the built in applications request memory. that might sound like a trivial thing, but in all this feature is responsible for freeing up a HUGE amount of RAM (huge by N95 standards).

if you have an app that can show you your free RAM (i use Handy Taskman, it is by no means the only app capable of this - there is a free trial available for this and others) — you can use this sort of app to see how much RAM you have at any given time.

on my N95, pre v20, on a fresh boot i would have (iirc) about 16MB of ram available. that means that i only had 16mb to share between any apps i wanted to run. if anything behaved poorly and leaked memory, i’d run out all the sooner. back then i couldn’t open my web browser and maps at the same time - one or the other would just quit unexpectedly.

now, with demand paging, apps that come preinstalled in the firmware require far less memory, this is because the phone doesnt copy all the of code into ram — it allows some of it (data sections) to be read dynamically from the ROM (actually flash memory, but its the place your firmware resides - this is the place that gets altered when you update your phone). it also allows apps to only load code into ram that is actually required (text-sections, this is the stuff that actually runs on the CPU inside… the instructions of the app). with demand paging, you might load MAPS without connecting to the GPS and so the maps program doesnt have to load the positioning libraries (pure hypothetical: i dont know that maps supports this. but the OS supports it now and thats the point. without OS support, maps would NEVER be able to do this. now, maps MAY do this, even if it CAN not, yet).

thats my understanding.
hope this clears up demand paging a bit for you.

-bit

VoIP: which one do you use? i use truphone, but i’m on at&t in the us - so i cant connect via 3G (n95-1 doesn’t talk to their 3G). truphone doesn’t even try to complete a call over EDGE.

my solution so far: i keep Fring connected to Gizmo/Skype/Gtalk automatically switching between EDGE and wifi. and i let truphone automatically roam onto wifi as well. i cant remember if i had to change the default port on truphone or not… but the option is there. so i’ve got myself logged in to 2 SIP accounts plus Skype almost 100% of the time. did i call this a solution? its more of an experiment: i’m still holding out to see which service will work BEST for me. i’m thinking i can likely connect via truphone using Fring instead if i want to - but gizmo is cheaper (except that truphone forwards to gsm for free, gizmo doesn’t)

just curious, what do you use?
-bit